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  • Fast file search algorithm for IP addresses

    - by Dave Jarvis
    Question What is the fastest way to find if an IP address exists in a file that contains IP addresses sorted as: 219.93.88.62 219.94.181.87 219.94.193.96 220.1.72.201 220.110.162.50 220.126.52.187 220.126.52.247 Constraints No database (e.g., MySQL, PostgreSQL, Oracle, etc.). Infrequent pre-processing is allowed (see possibilities section) Would be nice not to have to load the file each query (131Kb) Uses under 5 megabytes of disk space File Details One IP address per line 9500+ lines Possible Solutions Create a directory hierarchy (radix tree?) then use is_dir() (sadly, this uses 87 megabytes)

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  • libpcap IP Packet Reassembly

    - by holydiver
    Hello all, I'm looking for a sample code for IP packet reassembly in C with libpcap*. Is IP packet defragmentation implemented in libpcap library officially? I've found this proposal : http://www.mail-archive.com/[email protected]/msg02991.html[this][1] . Are there any implementation of defragmentation of IP packets. [1]: http://www.mail-archive.com/[email protected]/msg02991.html [+] *The reason for looking for the sample code is just for fun and learning and i don't want to spend too much time for writing code for IP packet reassembly.

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  • Windows - VBScript - Determine IP address of computer on network

    - by tward
    I have written some VBScripts to automate tasks that I perform on computers over the network. These work great for most tasks however within our network we have problems with the IP address in DNS being correct all the time. This mainly occurs with laptops where we have different IP ranges for machines on the wireless and wired network. For example a machine may boot up wired in the morning and get an IP address: 10.10.10.1 When it switches to wireless it will obtain an address in a different subnet: 10.11.10.1 When you try to connect to that machine it still returns the old IP address (10.10.10.1) even though the computer now has a new one. I have found that I can still connect to that computer's C$ share via \computer name\c$ even though the machine does not ping. Obviously there is some other kind of address resolution going on, my question is how do I harness this to allow my VBScripts connect to WMI? Thanks!

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  • Block specific IP block from my website in PHP

    - by iTayb
    I'd like, for example, block every IP from base 89.95 (89.95..). I don't have .htaccess files on my server, so I'll have to do it with PHP. if ($_SERVER['REMOTE_ADDR'] == "89.95.25.37") die(); Would block specific IP. How can I block entire IP blocks? Thank you very much.

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  • Ubuntu second static IP, ifconfig, /etc/network/interfaces

    - by Schmoove
    I would like to add a second static IP to my local Ubuntu 11.10 desktop machine and have it automatically available after rebooting. So far I am successfully using ifconfig to to temporarily set up an alias for my primary network interface: # ifconfig eth1:0 192.168.178.3 up # ifconfig eth1 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.2 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::ca60:ff:feef:a3d9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:61929 errors:0 dropped:0 overruns:0 frame:0 TX packets:64034 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:45330863 (45.3 MB) TX bytes:28175192 (28.1 MB) Interrupt:42 Base address:0x4000 eth1:0 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.3 Bcast:192.168.178.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:42 Base address:0x4000 However, when I add the following to /etc/network/interfaces, the alias is not up and running as expected after a reboot: # vi /etc/network/interfaces auto eth1:0 iface eth1:0 inet static address 192.168.178.3 netmask 255.255.255.0 I would like to know what to configure to get this to work. As a side note, I am running gnome shell.

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  • IP address spoofing

    - by SomeOne
    Is it true if I want to make ip spoofing program I need only a program that can change my machine ip address??? if true how can i use System.Net - IPAddress Class to set the ip address ....

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  • Connecting to same public IP from different locations yields different results

    - by DHall
    Since yesterday I've been unable to access one of my favorite time-wasting sites, boston.com. It starts to load but then it gets redirected to pagesinxt or something like that. After some investigation, I've narrowed it down to an issue with cache.boston.com, but only from my work location. I found the IP (216.38.160.107) , but even that doesn't work correctly from here at work. When I do a telnet 216.38.160.107 80 GET http://cache.boston.com/universal/css/hp_bgcom.css from another location, I get a nice long CSS, as expected. From here, I get an error (trimmed for size): HTTP/1.1 400 Bad Request Your request could not be processed. Request could not be handled This could be caused by a misconfiguration, or possibly a malformed request. For assistance, contact your network support team. Is there any way I can troubleshoot this further on my end? Tracert doesn't tell me anything too useful: Tracing route to vwrpx1.ttn.xpc-mii.net [216.38.160.107] over a maximum of 30 hops: 1 * * * Request timed out. Since it's not really work-related, I don't really want to bring it up to our network team unless I know what's going on, or if there's some risk to the network (ex. malware or something)

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  • Mac Mavericks, ngircd localhost works, private IP doesn't

    - by user221945
    I have configured ngircd to listen on my private ip address. It doesn't. Localhost works fine. Configuration test: ngIRCd 21-IDENT+IPv6+IRCPLUS+SSL+SYSLOG+TCPWRAP+ZLIB-x86_64/apple/darwin13.2.0 Copyright (c)2001-2013 Alexander Barton () and Contributors. Homepage: http://ngircd.barton.de/ This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Reading configuration from "/opt/local/etc/ngircd.conf" ... OK, press enter to see a dump of your server configuration ... [GLOBAL] Name = irc.bellbookandpistol.com AdminInfo1 = Jaedreth AdminInfo2 = San Diego County CA, US AdminEMail = [email protected] HelpFile = /opt/local/share/doc/ngircd/Commands.txt Info = Server Info Text Listen = 10.0.1.5,127.0.0.1 MotdFile = MotdPhrase = "Welcome to irc.bellbookandpistol.com" Password = PidFile = Ports = 6667 ServerGID = wheel ServerUID = root [LIMITS] ConnectRetry = 60 IdleTimeout = 0 MaxConnections = 0 MaxConnectionsIP = 6 MaxJoins = -1 MaxNickLength = 9 MaxListSize = 0 PingTimeout = 120 PongTimeout = 20 [OPTIONS] AllowedChannelTypes = #&+ AllowRemoteOper = no ChrootDir = CloakHost = CloakHostModeX = CloakHostSalt = kBih5mu\kVI!DC6eifT(hd4m/0'zb/=: CloakUserToNick = no ConnectIPv4 = yes ConnectIPv6 = no DefaultUserModes = DNS = yes IncludeDir = /opt/local/etc/ngircd.conf.d MorePrivacy = no NoticeAuth = no OperCanUseMode = no OperChanPAutoOp = yes OperServerMode = no RequireAuthPing = no ScrubCTCP = no SyslogFacility = local5 WebircPassword = [SSL] CertFile = CipherList = HIGH:!aNULL:@STRENGTH DHFile = KeyFile = KeyFilePassword = Ports = [OPERATOR] Name = [REDACTED] Password = [REDACTED] Mask = [CHANNEL] Name = #BBP Modes = tnk Key = MaxUsers = 0 Topic = Welcome to the Bell, Book and Pistol IRC Server! KeyFile = As you can see, it should be listening on 10.0.1.5, but it isn't. After turning on Apache manually, port 80 works on 10.0.1.5, but port 6667 doesn't. It only works on localhost. Is there some terminal command I could use or some config file I could edit to get this to work?

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  • "Ethernet" doesn't have a valid IP configuration

    - by Xuzuno
    I'm using an ethernet cord to connect to my internet and it has been working well until Thursday morning when I turned on my laptop (Windows 8) to see a yellow triangle sign in the bottom right hand corner, in front of the ethernet connected symbol. Since then I haven't been able been able to access the internet from my computer. When I hover over it, it says that it is an "Unidentified network" and there is "No internet access". I've run the Windows 8 troubleshooting and it says that the problem found was ""Ethernet" doesn't have a valid IP configuration", but I'm unsure how to fix it. I'm thinking that the problem is to do with my computer rather than my network, because I've tried another laptop (Windows 7) through the same ethernet cable and connection and the internet works fine on the other laptop. I've tried so many fixes that I've found online, with none of them actually working. Yesterday I even tried a full system reset, where I re-installed Windows 8, re-partitioned and wiped everything off the hard drive, but it still appears have the exact same problem. Today I also purchased and tried a new ethernet cable which didn't work, so I then purchased a USB to Ethernet adapter, to make sure that it wasn't my ethernet port on my laptop that was faulty. That didn't work either, and the same problem still remains. I feel like I've tried everything, so can someone please help me?

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  • AWS Load Balancer with a static IP address

    - by user965904
    I have a set-up running on Amazon cloud with a couple of EC2 Instances running through a load balancer. It is important that the site has a unique(static) IP or set of IPs as I'm plugging in 3rd party APIs which only accept requests made from IPs which have been added to their whitelist. So basically unless we can give these 3rd parties a static IP or range of IPs that the requests from the site will always come from then we would be unable to make any calls to them. Anyone knows how to achieve this as I know that Elastic IPs are not compatible with load balancers? If I were to look up the IP of the load balancer DNS name (e.g. dualstack.awseb-BAMobile-ENV-xxxxxxxxx.eu-west-1.elb.amazonaws.com resolves to 200.200.200.200) would that IP be Static? Any help/advise is greatly appreciated guys.

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  • .bat file to update loopback controller to external ip

    - by cable729
    Okay, so I've figured out how to get my external ip using wget: wget -q -O - http://whatismyip.com/automation/n09230945.asp that outputs the ip to the command console. adding currentip.txt to the end will write it to a text file. But what I want to do is use netsh interface ip set address name="Local Area Connection 2" source=static addr=[WHAT DO I PUT HERE] Also, a way to make the command prompt not flash would be nice too :)

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  • Dynamic picture that displays the visitors IP address?

    - by Rob
    I see this a lot now, jpg files displaying your IP address. To you of course, not to others, they would see their own For example: How is this even possible? If this is possible, would it be possible to log an IP into a MySQL database from the picture as well? Is my IP getting logged when I view this?

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  • Java: How do I get the IP of the local interface that can reach a remote IP?

    - by Per Fagrell
    I have a Java application that registers a server component in a service provider, and then sends the service name to a client. The client uses the service name to get an address out of the service provider to the server. However, the server has several interfaces only 1 of which the client get get at, so the service must be registered with the right IP. We discovered the client through a broadcast, so I have the client IP and an Enumeration of the computers network interfaces. How do I match the IP to an interface, not knowing what the netmask of the client IP is? Spontaneously I imagine turning all the addresses to ints and chomping the local ips with their netmask and looking for a 'best match', but I wonder if there is a better way? (this is an enterprise(tm) solution, so cutting out the service provider isn't an option, at least not w/o a political campaign first ;) )

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  • php web based portal authentication through IP.

    - by user434885
    i have a web portal running which involves basic data entry. The issue being that this is highly sensitive data. And the credibility of the data entry personel is very low. Therefore i have implemented recording of IP when an entry is made. The Problem i am facing is if this if this person starts forwarding his IP from a proxy server then i am unable to track authenticity of the data. How do i detect if the IP forwarding is happening/ get the real ip address of the person.

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  • Cannot access personal website from home IP. More details inside.

    - by GX67
    This is a recent problem I've been having. My site can be accessed from almost everywhere else except from my home IP, where I do most of my editing/updating, etc. I've tested my connection from my school's network, a friend's connection from out of state (multiple states), and through a tethered connection with my friend's Android. It works in all those cases, both viewing, accessing the cPanel, and using FTP. Here's the problem that happens to me when I try to view it from my home IP: The page times out in Firefox, IE, and Chrome. Using the cmd, I ran tracert and ping, both as failed attempts. Log here. downforeveryoneorjustme.com says my site is up. So do the other site checkers. I can't access my cPanel or FTP accounts. I can't access the host site. (I use perfectz.info for hosting, and I can't access their site either.) System settings: No firewall enabled. Ports are seemingly properly forwarded. (e.g. The ports are open in the router settings, and are open everywhere else.) I have an email forwarder set up from the cPanel that works just fine. (i.e. I can receive emails sent to that address. If any other information is needed, I'll do my best to provide it. UPDATE @ilhan: I use two things: 1) The site cPanel from in-browser. 2) Dreamweaver CS5 FTP. @Matthias: I tested both, and it passes the dual stack with a 10/10. What should I do then?

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  • NLB NIC w/ Static IP permanently "Acquiring Network Address" after adding more IP's to the cluster

    - by I.T. Support
    We have a 2 node NLB cluster. I recently added more IP's to the cluster range, after which point, the NLB NIC's on both of my nodes ended up in a permanent "acquiring network address" state. The cluster appears to be functioning despite this hang in acquiring an address. We've also rebooted the machines, and these NIC's remain in this state "acquiring network address" even after reboot, which I find troubling. Questions: Does anyone know where I can find documentation on how NLB binds to a NIC? (are there dll's involved, drivers, etc.) Does anyone know of any programs that have known incompatability issues with NLB? We have an application server installed on these NLB nodes (AOL Server) that interacts with the NIC's as well, and I suspect that it might be causing this issue. Before I go directly to Microsoft, I want to gather as much information as possible about the issue. Any help / guidance would be much appreciated...

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  • asterisk public ip and clients with public / private ip

    - by user1165435
    I am using asterisk with a public ip. I have 4 clients which could be behind a nat or with public ip. I did set for all the clients nat=yes and canreinvite=no and qualify=yes. I did notice that if the clients were behind the nat everything went ok, but if the clients had public the call did not establish (no ringing on the asterisk server). WHere is the problem? Is there a bug in asterisk? As I've no there should be no problem for public ip and server with public ip.

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  • quick look at: dm_db_index_physical_stats

    - by fatherjack
    A quick look at the key data from this dmv that can help a DBA keep databases performing well and systems online as the users need them. When the dynamic management views relating to index statistics became available in SQL Server 2005 there was much hype about how they can help a DBA keep their servers running in better health than ever before. This particular view gives an insight into the physical health of the indexes present in a database. Whether they are use or unused, complete or missing some columns is irrelevant, this is simply the physical stats of all indexes; disabled indexes are ignored however. In it’s simplest form this dmv can be executed as:   The results from executing this contain a record for every index in every database but some of the columns will be NULL. The first parameter is there so that you can specify which database you want to gather index details on, rather than scan every database. Simply specifying DB_ID() in place of the first NULL achieves this. In order to avoid the NULLS, or more accurately, in order to choose when to have the NULLS you need to specify a value for the last parameter. It takes one of 4 values – DEFAULT, ‘SAMPLED’, ‘LIMITED’ or ‘DETAILED’. If you execute the dmv with each of these values you can see some interesting details in the times taken to complete each step. DECLARE @Start DATETIME DECLARE @First DATETIME DECLARE @Second DATETIME DECLARE @Third DATETIME DECLARE @Finish DATETIME SET @Start = GETDATE() SELECT * FROM [sys].[dm_db_index_physical_stats](DB_ID(), NULL, NULL, NULL, DEFAULT) AS ddips SET @First = GETDATE() SELECT * FROM [sys].[dm_db_index_physical_stats](DB_ID(), NULL, NULL, NULL, 'SAMPLED') AS ddips SET @Second = GETDATE() SELECT * FROM [sys].[dm_db_index_physical_stats](DB_ID(), NULL, NULL, NULL, 'LIMITED') AS ddips SET @Third = GETDATE() SELECT * FROM [sys].[dm_db_index_physical_stats](DB_ID(), NULL, NULL, NULL, 'DETAILED') AS ddips SET @Finish = GETDATE() SELECT DATEDIFF(ms, @Start, @First) AS [DEFAULT] , DATEDIFF(ms, @First, @Second) AS [SAMPLED] , DATEDIFF(ms, @Second, @Third) AS [LIMITED] , DATEDIFF(ms, @Third, @Finish) AS [DETAILED] Running this code will give you 4 result sets; DEFAULT will have 12 columns full of data and then NULLS in the remainder. SAMPLED will have 21 columns full of data. LIMITED will have 12 columns of data and the NULLS in the remainder. DETAILED will have 21 columns full of data. So, from this we can deduce that the DEFAULT value (the same one that is also applied when you query the view using a NULL parameter) is the same as using LIMITED. Viewing the final result set has some details that are worth noting: Running queries against this view takes significantly longer when using the SAMPLED and DETAILED values in the last parameter. The duration of the query is directly related to the size of the database you are working in so be careful running this on big databases unless you have tried it on a test server first. Let’s look at the data we get back with the DEFAULT value first of all and then progress to the extra information later. We know that the first parameter that we supply has to be a database id and for the purposes of this blog we will be providing that value with the DB_ID function. We could just as easily put a fixed value in there or a function such as DB_ID (‘AnyDatabaseName’). The first columns we get back are database_id and object_id. These are pretty explanatory and we can wrap those in some code to make things a little easier to read: SELECT DB_NAME([ddips].[database_id]) AS [DatabaseName] , OBJECT_NAME([ddips].[object_id]) AS [TableName] … FROM [sys].[dm_db_index_physical_stats](DB_ID(), NULL, NULL, NULL, NULL) AS ddips  gives us   SELECT DB_NAME([ddips].[database_id]) AS [DatabaseName] , OBJECT_NAME([ddips].[object_id]) AS [TableName], [i].[name] AS [IndexName] , ….. FROM [sys].[dm_db_index_physical_stats](DB_ID(), NULL, NULL, NULL, NULL) AS ddips INNER JOIN [sys].[indexes] AS i ON [ddips].[index_id] = [i].[index_id] AND [ddips].[object_id] = [i].[object_id]     These handily tie in with the next parameters in the query on the dmv. If you specify an object_id and an index_id in these then you get results limited to either the table or the specific index. Once again we can place a  function in here to make it easier to work with a specific table. eg. SELECT * FROM [sys].[dm_db_index_physical_stats] (DB_ID(), OBJECT_ID(‘AdventureWorks2008.Person.Address’) , 1, NULL, NULL) AS ddips   Note: Despite me showing that functions can be placed directly in the parameters for this dmv, best practice recommends that functions are not used directly in the function as it is possible that they will fail to return a valid object ID. To be certain of not passing invalid values to this function, and therefore setting an automated process off on the wrong path, declare variables for the OBJECT_IDs and once they have been validated, use them in the function: DECLARE @db_id SMALLINT; DECLARE @object_id INT; SET @db_id = DB_ID(N’AdventureWorks_2008′); SET @object_id = OBJECT_ID(N’AdventureWorks_2008.Person.Address’); IF @db_id IS NULL BEGINPRINT N’Invalid database’; ENDELSE IF @object_id IS NULL BEGINPRINT N’Invalid object’; ENDELSE BEGINSELECT * FROM sys.dm_db_index_physical_stats (@db_id, @object_id, NULL, NULL , ‘LIMITED’); END; GO In cases where the results of querying this dmv don’t have any effect on other processes (i.e. simply viewing the results in the SSMS results area)  then it will be noticed when the results are not consistent with the expected results and in the case of this blog this is the method I have used. So, now we can relate the values in these columns to something that we recognise in the database lets see what those other values in the dmv are all about. The next columns are: We’ll skip partition_number, index_type_desc, alloc_unit_type_desc, index_depth and index_level  as this is a quick look at the dmv and they are pretty self explanatory. The final columns revealed by querying this view in the DEFAULT mode are avg_fragmentation_in_percent. This is the amount that the index is logically fragmented. It will show NULL when the dmv is queried in SAMPLED mode. fragment_count. The number of pieces that the index is broken into. It will show NULL when the dmv is queried in SAMPLED mode. avg_fragment_size_in_pages. The average size, in pages, of a single fragment in the leaf level of the IN_ROW_DATA allocation unit. It will show NULL when the dmv is queried in SAMPLED mode. page_count. Total number of index or data pages in use. OK, so what does this give us? Well, there is an obvious correlation between fragment_count, page_count and avg_fragment_size-in_pages. We see that an index that takes up 27 pages and is in 3 fragments has an average fragment size of 9 pages (27/3=9). This means that for this index there are 3 separate places on the hard disk that SQL Server needs to locate and access to gather the data when it is requested by a DML query. If this index was bigger than 72KB then having it’s data in 3 pieces might not be too big an issue as each piece would have a significant piece of data to read and the speed of access would not be too poor. If the number of fragments increases then obviously the amount of data in each piece decreases and that means the amount of work for the disks to do in order to retrieve the data to satisfy the query increases and this would start to decrease performance. This information can be useful to keep in mind when considering the value in the avg_fragmentation_in_percent column. This is arrived at by an internal algorithm that gives a value to the logical fragmentation of the index taking into account the multiple files, type of allocation unit and the previously mentioned characteristics if index size (page_count) and fragment_count. Seeing an index with a high avg_fragmentation_in_percent value will be a call to action for a DBA that is investigating performance issues. It is possible that tables will have indexes that suffer from rapid increases in fragmentation as part of normal daily business and that regular defragmentation work will be needed to keep it in good order. In other cases indexes will rarely become fragmented and therefore not need rebuilding from one end of the year to another. Keeping this in mind DBAs need to use an ‘intelligent’ process that assesses key characteristics of an index and decides on the best, if any, defragmentation method to apply should be used. There is a simple example of this in the sample code found in the Books OnLine content for this dmv, in example D. There are also a couple of very popular solutions created by SQL Server MVPs Michelle Ufford and Ola Hallengren which I would wholly recommend that you review for much further detail on how to care for your SQL Server indexes. Right, let’s get back on track then. Querying the dmv with the fifth parameter value as ‘DETAILED’ takes longer because it goes through the index and refreshes all data from every level of the index. As this blog is only a quick look a we are going to skate right past ghost_record_count and version_ghost_record_count and discuss avg_page_space_used_in_percent, record_count, min_record_size_in_bytes, max_record_size_in_bytes and avg_record_size_in_bytes. We can see from the details below that there is a correlation between the columns marked. Column 1 (Page_Count) is the number of 8KB pages used by the index, column 2 is how full each page is (how much of the 8KB has actual data written on it), column 3 is how many records are recorded in the index and column 4 is the average size of each record. This approximates to: ((Col1*8) * 1024*(Col2/100))/Col3 = Col4*. avg_page_space_used_in_percent is an important column to review as this indicates how much of the disk that has been given over to the storage of the index actually has data on it. This value is affected by the value given for the FILL_FACTOR parameter when creating an index. avg_record_size_in_bytes is important as you can use it to get an idea of how many records are in each page and therefore in each fragment, thus reinforcing how important it is to keep fragmentation under control. min_record_size_in_bytes and max_record_size_in_bytes are exactly as their names set them out to be. A detail of the smallest and largest records in the index. Purely offered as a guide to the DBA to better understand the storage practices taking place. So, keeping an eye on avg_fragmentation_in_percent will ensure that your indexes are helping data access processes take place as efficiently as possible. Where fragmentation recurs frequently then potentially the DBA should consider; the fill_factor of the index in order to leave space at the leaf level so that new records can be inserted without causing fragmentation so rapidly. the columns used in the index should be analysed to avoid new records needing to be inserted in the middle of the index but rather always be added to the end. * – it’s approximate as there are many factors associated with things like the type of data and other database settings that affect this slightly.  Another great resource for working with SQL Server DMVs is Performance Tuning with SQL Server Dynamic Management Views by Louis Davidson and Tim Ford – a free ebook or paperback from Simple Talk. Disclaimer – Jonathan is a Friend of Red Gate and as such, whenever they are discussed, will have a generally positive disposition towards Red Gate tools. Other tools are often available and you should always try others before you come back and buy the Red Gate ones. All code in this blog is provided “as is” and no guarantee, warranty or accuracy is applicable or inferred, run the code on a test server and be sure to understand it before you run it on a server that means a lot to you or your manager.

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  • Hosting a website from a dynamic IP

    - by nick
    I recently upgraded my internet to the point that it is much faster and more reliable than my current webhost. I would like to move my current domain to be hosted at home, but my IP address is dynamic. As far as I know, I only get a new IP when I restart my modem and or router (which is almost never) or when cable one (my ISP) pushes out a firmware update (rarely). There are a few ways I can see doing this 1) convince my ISP to give me a static IP 2) assign my router my current IP to force a static IP (which might work?) 3) set my dns record to my current IP address and update it on the rare occasions that it changes. Obviously I'm hoping that the first one works, but I don't want to pay a lot of extra money (if that's what it takes) to get a static IP address. Has anyone had any luck with something like that?

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  • Server overloaded with log messages: tty_release_dev: pts0: read/write wait queue active!

    - by Raph
    In the logs, I have this (extract from the full kernel messages logges at 06:01:14): Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.863038] BUG: unable to handle kernel NULL pointer dereference at 0000000000000015 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861081] Process telnet (pid: 20247, threadinfo ffff8800f8598000, task ffff8800024d4500) And then the server logs flooded by this message: Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861547] tty_release_dev: pts0: read/write wait queue active! In the end, 2 hours later, I had to reboot because it had become inaccessible: the load hat grown to 160%. The last command does not show anyone logged on pts0 at that time. I also don't know where this telnet process could come from.... This is an AWS instance running UBUNTU 10.04 LTS And here are the complete logs: Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.863038] BUG: unable to handle kernel NULL pointer dereference at 0000000000000015 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861007] IP: [<ffffffff81363dde>] n_tty_read+0x2ce/0x970 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861019] PGD ee13d067 PUD f8698067 PMD 0 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861025] Oops: 0000 [#1] SMP Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861028] last sysfs file: /sys/devices/xen/vbd-2208/block/sdk/removable Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861032] CPU 0 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861034] Modules linked in: ipv6 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861040] Pid: 20247, comm: telnet Not tainted 2.6.32-312-ec2 #24-Ubuntu Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861042] RIP: e030:[<ffffffff81363dde>] [<ffffffff81363dde>] n_tty_read+0x2ce/0x970 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861047] RSP: e02b:ffff8800f8599d88 EFLAGS: 00010246 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861049] RAX: 0000000000000015 RBX: ffff8800f8598000 RCX: 0000000001aed069 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861052] RDX: 0000000000000000 RSI: ffff8800f8599e67 RDI: ffff8801dd833d1c Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861054] RBP: ffff8800f8599e98 R08: ffffffff8135eb10 R09: 7fffffffffffffff Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861057] R10: 0000000000000000 R11: 0000000000000246 R12: ffff8801dd833800 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861059] R13: 0000000000000000 R14: ffff8801dd833a68 R15: ffff8801dd833d1c Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861065] FS: 00007f90121f6720(0000) GS:ffff880002c40000(0000) knlGS:0000000000000000 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861068] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861070] CR2: 0000000000000015 CR3: 0000000032a59000 CR4: 0000000000002660 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861073] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861076] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861081] Process telnet (pid: 20247, threadinfo ffff8800f8598000, task ffff8800024d4500) Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861083] Stack: Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861085] 0000000000000000 0000000001aed069 ffff8801dd8339c8 ffff8800024d4500 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861089] <0> ffff8801dd8339c0 ffff8801dd833c90 0000000001aed027 ffff8800024d4500 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861094] <0> ffff8801dd8338d8 0000000000000000 ffff8800024d4500 0000000000000000 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861099] Call Trace: Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861107] [<ffffffff81034bc0>] ? default_wake_function+0x0/0x10 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861113] [<ffffffff8135ebb6>] tty_read+0xa6/0xf0 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861118] [<ffffffff810ee7e5>] vfs_read+0xb5/0x1a0 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861122] [<ffffffff810ee91c>] sys_read+0x4c/0x80 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861127] [<ffffffff81009ba8>] system_call_fastpath+0x16/0x1b Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861131] [<ffffffff81009b40>] ? system_call+0x0/0x52 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861133] Code: 85 d2 0f 84 92 00 00 00 45 8b ac 24 5c 02 00 00 f0 45 0f b3 2e 45 19 ed 49 63 84 24 5c 02 00 00 49 8b 94 24 50 02 00 00 4c 89 ff <0f> be 1c 02 e8 a9 d3 14 00 41 8b 94 24 5c 02 00 00 41 83 ac 24 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861171] RIP [<ffffffff81363dde>] n_tty_read+0x2ce/0x970 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861175] RSP <ffff8800f8599d88> Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861171] RIP [<ffffffff81363dde>] n_tty_read+0x2ce/0x970 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861175] RSP <ffff8800f8599d88> Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861177] CR2: 0000000000000015 Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861205] ---[ end trace f10eee2057ff4f6b ]--- Apr 21 06:01:14 ip-10-49-109-107 kernel: [233185.861547] tty_release_dev: pts0: read/write wait queue active!

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  • Mac Server bizzare routing table

    - by The Unix Janitor
    My mac routing table usually is very simple. I know it's based on bsd , but what's it doing or trying to do. My routing table is usually very simple however, the second one, default was point to link5 ? Is this normal, or is this IPV6 craziness at work? Can somehelp me understand what OSX/BSD is doing? nternet: Destination Gateway Flags Refs Use Netif Expire default 192.168.1.254 UGSc 22 0 en1 127 127.0.0.1 UCS 0 0 lo0 127.0.0.1 127.0.0.1 UH 4 44102 lo0 169.254 link#5 UCS 0 0 en1 192.168.1 link#5 UCS 6 0 en1 192.168.1.1 0:18:39:6d:89:c5 UHLWIi 0 0 en1 739 192.168.1.189 50:ea:d6:86:26:91 UHLWIi 0 0 en1 798 192.168.1.194 127.0.0.1 UHS 0 0 lo0 192.168.1.203 5c:95:ae:dd:34:8d UHLWIi 0 0 en1 316 192.168.1.253 a:76:ff:b5:51:79 UHLWIi 0 0 en1 911 192.168.1.254 8:76:ff:b5:51:79 UHLWIi 32 204 en1 1117 192.168.1.255 ff:ff:ff:ff:ff:ff UHLWbI 0 7 en1 Internet6: Destination Gateway Flags Netif Expire ::1 link#1 UHL lo0 fe80::%lo0/64 fe80::1%lo0 UcI lo0 fe80::1%lo0 link#1 UHLI lo0 fe80::%en1/64 link#5 UCI en1 fe80::21b:63ff:fec7:c486%en1 0:1b:63:c7:c4:86 UHLI lo0 fe80::223:12ff:fe01:d7fe%en1 0:23:12:1:d7:fe UHLWIi en1 ff01::%lo0/32 fe80::1%lo0 UmCI lo0 ff01::%en1/32 link#5 UmCI en1 ff02::%lo0/32 fe80::1%lo0 UmCI lo0 ff02::%en1/32 link#5 UmCI en1 ----------------------------------- Bizzare routing table here Internet: Destination Gateway Flags Refs Use Netif Expire default link#5 UCS 113 0 en1 17.72.255.12 0:50:7f:5e:92:e2 UHLWIi 2 7 en1 1156 64.4.23.141 0:50:7f:5e:92:e2 UHLWIi 0 3 en1 1181 64.4.23.143 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1189 64.4.23.147 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1183 64.4.23.149 link#5 UHLWIi 0 1 en1 64.4.23.150 0:50:7f:5e:92:e2 UHLWIi 0 24 en1 1175 64.4.23.151 link#5 UHLWIi 0 1 en1 64.4.23.153 link#5 UHLWIi 0 1 en1 64.4.23.155 link#5 UHLWIi 0 1 en1 64.4.23.157 0:50:7f:5e:92:e2 UHLWIi 0 3 en1 1181 64.4.23.165 link#5 UHLWIi 0 2 en1 64.4.23.166 link#5 UHLWIi 0 1 en1 65.55.223.15 0:50:7f:5e:92:e2 UHLWIi 3 21 en1 1189 65.55.223.16 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 65.55.223.17 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1199 65.55.223.20 link#5 UHLWIi 0 1 en1 65.55.223.23 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1199 65.55.223.31 link#5 UHLWIi 0 1 en1 65.55.223.32 link#5 UHLWIi 0 1 en1 65.55.223.37 0:50:7f:5e:92:e2 UHLWIi 3 21 en1 1189 65.55.223.38 link#5 UHLWIi 0 1 en1 69.163.252.33 0:50:7f:5e:92:e2 UHLWIi 1 9 en1 1181 77.67.32.254 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1164 111.221.74.13 0:50:7f:5e:92:e2 UHLWIi 0 24 en1 1183 111.221.74.15 link#5 UHLWIi 0 1 en1 111.221.74.16 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1183 111.221.74.17 0:50:7f:5e:92:e2 UHLWIi 3 23 en1 1172 111.221.74.21 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 111.221.74.23 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1172 111.221.74.24 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1181 111.221.74.26 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1199 111.221.74.29 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1181 111.221.74.31 link#5 UHLWIi 0 1 en1 111.221.74.37 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1190 111.221.74.38 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1199 111.221.77.141 0:50:7f:5e:92:e2 UHLWIi 0 3 en1 1199 111.221.77.144 link#5 UHLWIi 0 1 en1 111.221.77.145 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1190 111.221.77.149 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1183 111.221.77.154 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 111.221.77.156 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1190 111.221.77.157 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1183 111.221.77.162 link#5 UHLWIi 0 1 en1 111.221.77.165 link#5 UHLWIi 0 1 en1 127 127.0.0.1 UCS 0 0 lo0 127.0.0.1 127.0.0.1 UH 4 40073 lo0 157.55.56.140 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1199 157.55.56.141 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 157.55.56.143 link#5 UHLWIi 0 1 en1 157.55.56.147 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1183 157.55.56.148 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1183 157.55.56.149 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1189 157.55.56.150 link#5 UHLWIi 0 1 en1 157.55.56.157 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1172 157.55.56.158 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1175 157.55.130.143 link#5 UHLWIi 0 1 en1 157.55.130.144 link#5 UHLWIi 0 1 en1 157.55.130.145 0:50:7f:5e:92:e2 UHLWIi 0 24 en1 1181 157.55.130.152 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1199 157.55.130.153 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1172 157.55.130.155 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1189 157.55.130.156 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1186 157.55.130.157 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1189 157.55.130.158 0:50:7f:5e:92:e2 UHLWIi 0 3 en1 1172 157.55.130.160 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1189 157.55.130.162 0:50:7f:5e:92:e2 UHLWIi 3 21 en1 1193 157.55.130.166 link#5 UHLWIi 0 1 en1 157.55.235.141 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1193 157.55.235.142 link#5 UHLWIi 1 1 en1 157.55.235.144 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1172 157.55.235.145 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1172 157.55.235.149 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 157.55.235.151 link#5 UHRLWIi 0 36 en1 157.55.235.152 0:50:7f:5e:92:e2 UHLWIi 3 21 en1 1189 157.55.235.153 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1178 157.55.235.156 link#5 UHLWIi 0 2 en1 157.55.235.157 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 157.55.235.158 link#5 UHLWIi 0 1 en1 157.55.235.159 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 157.55.235.162 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1183 157.55.235.166 0:50:7f:5e:92:e2 UHLWIi 0 25 en1 1181 157.56.52.14 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1181 157.56.52.15 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1183 157.56.52.16 link#5 UHLWIi 0 1 en1 157.56.52.17 0:50:7f:5e:92:e2 UHLWIi 3 14 en1 1199 157.56.52.19 link#5 UHLWIi 0 1 en1 157.56.52.20 0:50:7f:5e:92:e2 UHLWIi 3 17 en1 1199 157.56.52.22 0:50:7f:5e:92:e2 UHLWIi 0 24 en1 1181 157.56.52.25 link#5 UHLWIi 0 1 en1 157.56.52.28 link#5 UHLWIi 0 1 en1 157.56.52.29 link#5 UHLWIi 0 1 en1 157.56.52.31 link#5 UHLWIi 0 1 en1 157.56.52.33 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1189 169.254 link#5 UC 1 0 en1 169.254.174.250 127.0.0.1 UHS 1 0 lo0 169.254.255.255 ff:ff:ff:ff:ff:ff UHLWb 0 2 en1 193.88.6.19 link#5 UHLWIi 0 1 en1 194.165.188.82 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1166 195.46.253.211 link#5 UHLWIi 0 1 en1 204.9.163.143 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1178 213.199.179.141 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1172 213.199.179.142 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1165 213.199.179.143 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1166 213.199.179.146 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1172 213.199.179.147 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1164 213.199.179.148 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1165 213.199.179.149 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1172 213.199.179.150 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1165 213.199.179.151 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1164 213.199.179.153 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1166 213.199.179.157 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1167 213.199.179.160 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1165 213.199.179.161 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1172 213.199.179.162 0:50:7f:5e:92:e2 UHLWIi 0 2 en1 1163 213.199.179.165 0:50:7f:5e:92:e2 UHLWIi 0 1 en1 1164 213.199.179.166 0:50:7f:5e:92:e2 UHLWIi 0 3 en1 1164 224.0.0.251 1:0:5e:0:0:fc UHmLWI 0 0 en1 255.255.255.255 ff:ff:ff:ff:ff:ff UHLWbI 0 2 en1 Internet6: Destination Gateway Flags Netif Expire ::1 link#1 UHL lo0 fe80::%lo0/64 fe80::1%lo0 UcI lo0 fe80::1%lo0 link#1 UHLI lo0 fe80::%en1/64 link#5 UCI en1 fe80::21b:63ff:fec7:c486%en1 0:1b:63:c7:c4:87 UHLI lo0 fe80::223:12ff:fe01:d7fe%en1 0:23:12:1:d7:ff UHLWIi en1 ff01::%lo0/32 fe80::1%lo0 UmCI lo0 ff01::%en1/32 link#5 UmCI en1 ff02::%lo0/32 fe80::1%lo0 UmCI lo0 ff02::%en1/32 link#5 UmCI en1

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  • IPv4 private address assignment

    - by helloworld922
    I'm working on a private network which uses static IPv4 addresses as well as DHCP addressing for the physical LAN network. At a previous company I worked at they would assign static addresses in the 10.*.*.* space and all DHCP/LAN addresses were assigned in the 192.168.*.* space. Both of these address spaces are defined in the IPv4 private address space and there were never any internal conflicts. From personal experience at home, school, at work, and pretty much any other machine I've dealt with extensively (Windows and a few Linux distros), the DHCP server would always by default choose an address from the 192.168.*.* address space. Now my question is can I rely on this behavior? Do DHCP servers always by default assign from the 192.168.*.* pool (or any pool other than the 10.*.*.* pool), leaving the 10.*.*.* pool free for private static addressing? If not, under what conditions might a DHCP server choose an address in the 10.*.*.* address space?

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