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  • Lots of dropped packages when tcpdumping on busy interface

    - by Frands Hansen
    My challenge I need to do tcpdumping of a lot of data - actually from 2 interfaces left in promiscuous mode that are able to see a lot of traffic. To sum it up Log all traffic in promiscuous mode from 2 interfaces Those interfaces are not assigned an IP address pcap files must be rotated per ~1G When 10 TB of files are stored, start truncating the oldest What I currently do Right now I use tcpdump like this: tcpdump -n -C 1000 -z /data/compress.sh -i any -w /data/livedump/capture.pcap $FILTER The $FILTER contains src/dst filters so that I can use -i any. The reason for this is, that I have two interfaces and I would like to run the dump in a single thread rather than two. compress.sh takes care of assigning tar to another CPU core, compress the data, give it a reasonable filename and move it to an archive location. I cannot specify two interfaces, thus I have chosen to use filters and dump from any interface. Right now, I do not do any housekeeping, but I plan on monitoring disk and when I have 100G left I will start wiping the oldest files - this should be fine. And now; my problem I see dropped packets. This is from a dump that has been running for a few hours and collected roughly 250 gigs of pcap files: 430083369 packets captured 430115470 packets received by filter 32057 packets dropped by kernel <-- This is my concern How can I avoid so many packets being dropped? These things I did already try or look at Changed the value of /proc/sys/net/core/rmem_max and /proc/sys/net/core/rmem_default which did indeed help - actually it took care of just around half of the dropped packets. I have also looked at gulp - the problem with gulp is, that it does not support multiple interfaces in one process and it gets angry if the interface does not have an IP address. Unfortunately, that is a deal breaker in my case. Next problem is, that when the traffic flows though a pipe, I cannot get the automatic rotation going. Getting one huge 10 TB file is not very efficient and I don't have a machine with 10TB+ RAM that I can run wireshark on, so that's out. Do you have any suggestions? Maybe even a better way of doing my traffic dump altogether.

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  • Error when sending mail to an external mail server from Postfix on CentOS

    - by yankitwizzy
    I just installed Postfix. i have not yet done any configuration on it. Each time I try to use it to sendmail from another application, it keeps telling me that COnnection was refused from the ip I want to connect to. This is the error I get [root@localhost /]# telnet mail.abuse.org Trying 69.43.160.153... telnet: connect to address 69.43.160.153: Connection refused telnet: Unable to connect to remote host: Connection refused COuld someone please help me the problem

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  • Reach self hosted server from LAN

    - by Freefri
    I have a self hosted server with Apache2 pointed with the domain example.com. I have also some virtual servers www.example.com, cloud.examle.com, etc. This server is in my LAN, and when I try to acces to my server within the lan throw www.examle.com y get my router's configuration page. From outside the LAN www.example.com and cloud.examle.com works properly. From inside the LAN 192.168.1.33 (server internal IP) shows the default webpage (www.examle.com), but I can not get cloud.examle.com I also have a LAN name server in 192.168.1.33 with bind9. I set up my gateway 192.168.1.1 with my LAN-NS as primary NS I solve this problem creating a new dns zone in the NS. This are my config files: ;ZONE-1 $ORIGIN . $TTL 86400 ; 1 day home.lan. IN SOA server.home.lan. hostmaster.home.lan. ( 2008080901 ; serial 8H ; refresh 4H ; retry 4W ; expire 1D ; minimum ) home.lan. IN NS server.home.lan. $ORIGIN home.lan. ; Set the address for localhost.home.lan localhost IN A 127.0.0.1 router IN A 192.168.1.1 server IN A 192.168.1.33 mypc IN A 192.168.1.132 ;ZONE-2 $ORIGIN . $TTL 86400 ; 1 day example.com. IN SOA www.example.com hostmaster.home.lan. ( 2008080902 ; serial 8H ; refresh 4H ; retry 4W ; expire 1D ; minimum ) example.com. IN NS 192.168.1.33 $ORIGIN examle.com. localhost IN A 127.0.0.1 www IN A 192.168.1.33 cloud IN A 192.168.1.33 My DNS and my names are working properly now My question are: What do you think about my solution? Can I change the A zone with CNAME to server.home.lan (this is the domain in the LAN to the server)? How can I set a default IP for all my whatever.example.com?

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  • How to configure sendmail to relay through a specific server

    - by ErebusBat
    I have a tiny home server setup behind my cable modem (bresnan communications). I want to be able for this box to send out email (not receive) for notifications and whatnot. What I have already done: I have installed and configured sendmail. I have added mail.bresnan.net as my SMART_HOST directive. What I belive the problem is When I attempt to send an email I get the following in my mail log: Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: from=aburns, size=140, class=0, nrcpts=1, msgid=<[email protected]>, relay=aburns@localhost Dec 22 10:24:17 batcave sm-mta[1531]: oBMHOHWZ001531: from=<[email protected]>, size=397, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: to=<[email protected]>, ctladdr=aburns (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30140, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBMHOHWZ001531 Message accepted for delivery) Dec 22 10:24:18 batcave sm-mta[1517]: oBMH9mVv001357: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:14:30, xdelay=00:00:42, mailer=relay, pri=300339, relay=pmx0.bresnan.net. [69.145.248.1], dsn=4.0.0, stat=Deferred: Connection timed out with pmx0.bresnan.net. You can see where the message is accepted for delivery by my sendmail server, then where it attempts to hand off to bresnan's server and it timesout. This is where my question is. Asstute readers will notice that pmx0.bresnan.net is not what I have my SMART_HOST directive set as. This is the (outside?) MX server for the bresnan.com/net domain. Apparently bresnan has their network configured so that you can not access this server from within their own network and instead must use the mail.bresnan.net server (which I can connect to). The problem is that I don't know how to tell sendmail to use this server and not the domain. What I have tried Setting a hosts entry so that the pmx0 server points to the mail IP address. This doesn't work, which makes sense as sendmail is obviously doing an MX query to find the server which returns the IP so there is never a need to do a 'normal' DNS resolve so the hosts file never gets involved.

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  • NFS server Windows 2008 - mounting via linux - input/output error help.

    - by pablo
    I want to try mounting a folder with NFS - I set up the NFS sharing on a windows 2008 R2 server, specified hosts in the NFS permissions (by IP address) and mounted via /etc/fstab it mounts, but when I try to list the folder, I get 'input/output error' the owner/group on the local mount point look weird too? drwx------ 2 4294967294 4294967294 4096 2011-02-10 19:15 data/ I mounted in /etc/fstab as: 10.0.6.55:/share$ /media/data nfs soft,intr,rsize=8192,wsize=8192 What am I doing wrong?

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  • Laptops on Windows Domain sometimes have problems accessing internet when off-site

    - by FSUScoot
    Hi all-- We've had this problem for a long time. When users travel, sometimes they can't get internet access from a wired or wireless connection. Here are a couple examples: 1) A user goes to a hotel and tries to access the wireless in their room. They can connect to the access point. They open a web browser and they can't get re-directed to the hotel's login page. Because they can't log in, there's no internet access. 2) A user goes to another laboratory/university and tries to access the wired network. They connect, link is fine, PC gets IP from DHCP but no internet access. There's no login page to be re-directed to. It should just "work". What I've found is that it's a DNS issue. Because the computer is on a Windows Domain, it seems it MUST use our DNS servers. Even if you connect to an outside network and do an ipconfig /all, it looks like everything is ok. It'll even show their DNS servers listed in the config. The computer just won't use the other network's DNS server. I found a reg key that keeps our DNS servers listed and it seems that they take priority every time: HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient All the values under that key are for our AD domain. NameServer and Searchlist never change. What I've found is if the user edits the NameServer string and puts the DNS server of the network they're on, everything works just fine. They get re-directed to the hotel's correct login page or their internet access starts working. It's only a problem if the network they're on blocks outside DNS or a hotel that uses an internal name in their front page redirection that only their DNS server knows about, i.e., not public. If the re-direct page starts with an IP, like 10.10.10.10, it'll work just fine. Obviously this isn't a fix for everyone. Most of my users are pretty knowledgeable so it’s easy for me to walk them through or send them a .reg file that they can edit and run. This problem isn't limited to Windows 7. It was like this with XP as well. It's not hardware related. The problem exists on both wired and wireless, Intel or Broadcom, laptops or desktops. Anyone else have this problem? Is there a GPO I can change that I missed? Got a good work-around for this? Thanks for any help!

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  • Amazon EC2 open ports for security groups present in other accounts

    - by rahul
    Hi, Assume, I am having 2 ec2 accounts (say A and B), both have different list of security groups. Now I want to open a particular port (say 80) for an instance running in account A, to account B. ie, I want to only allow account B instances, to access account A's 80 port. Could any one update me, is there a way to do this.?? Additionally, may I access account A's instance from account B's instance by using its private ip address/host name ?? Thanks in Advance,

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  • Repeated requests on our server?

    - by pitty.platsch
    I encountered something strange in the access log of our Apache server which I cannot explain. Requests for webpages that I or my colleagues do from the office's Windows network get repeated by another IP (that we don't know) a couple of seconds later. The user agent repeating our requests is Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; InfoPath.2) Has anyone an idea? Update: I've got some more information now. The referrer of the replicate is set to the URL I requested before and it's not the exact same request as the protocol version is changed from 'HTTP/1.1' to 'HTTP/1.0'. The IP is not just one, it's just one of a subnet (80.40.134.*). It's just the first request to a resource that's get repeated, so it seems the "spy" is building up some kind of cache of visited places. The repeater is also picky. I tried randomly URLs with different HTTP status codes and different file patterns. 301s and 200s are redone, 404s not. Image extensions seem to be ignored. While doing my tests I discovered that this behavior seems to be common as I found other clients visiting just after the first requests: 66.249.73.184 - - [25/Oct/2012:10:51:33 +0100] "GET /foobar/ HTTP/1.1" 200 10952 "-" "Mediapartners-Google" 50.17.125.180 - - [25/Oct/2012:10:51:33 +0100] "GET /foobar/ HTTP/1.1" 200 41312 "-" "Mozilla/5.0 (compatible; proximic; +http://www.proximic.com/info/spider.php)" I wasn't aware about this practice, so I don't see it that much as a threat anymore. I still want to find out who this is, so any further help is appreciated. I'll try later if this also happens if I query some other server where I have access to the access logs and will update here then.

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  • Is it possible to add asterisk serveralias to virtualhost without modifying httpd.conf manually?

    - by Favourite Chigozie Onwuemene
    Is it possible to add wildcard serveralias (example: *.somesite.com) in an apache server without modifying httpd.conf manually? I use a DNS different from my hosting server and i have added asterisk A record to my DNS to point all request like (test.somesite.com,test2.somesite.com) to my hosting servers IP, but i don't see anyway of adding asterisk serveraliases to apache httpd.conf file in my cpanel. Pls is there a solution?

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  • IPV6 - using tunnel broker / dns to provide ipv4 compatibility

    - by Bgnt44
    I've a tunnel broker from he.net associate with a IPV6 /64 subnet As a newby to ipv6, i've just discovered that its not reliable to only set a subdomain to a AAAA entry : because most of ISP will not be able to reach it Considering i got 3 vm, each with ipv6 ip , i would like to know if there any way to set up my dns to handle that ? I only got one IPV4 which is binded on the firewall maybe the tunnel can resolve hostname/ipv4 to ipv6 ? Thank you

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  • SQL Server 'Real Time' Mirroring Possible?

    - by Ryan
    We have a SQL Server that has important databases for our clients, if the server goes down we want another server to be ready to be switched over (we would just change the IP). The question is, how can we automatically sync the primary SQL Server to the secondary one periodically through out the day? Or even in real time? Thanks!

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  • Hotel like Wifi manager

    - by flpgdt
    Does anyone knows which are these systems that manages paid wifi networks and some hotels and airports? Even better, would anyone know a open/free project that would do or could be adapted to that end? The idea is simple, I want to let the network open at physical level so anyone can connect. After connected however, the clients would have access only to a specified page where they can logging in, and doing the necessary validations the router would allow these of those ports (or even everything) for his IP.

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  • How could I determine which SMB client/session has a specific file open on a Server 2008R2 Windows file server?

    - by Rasmir
    What I need a way to associate a client name or IP address with an open file, so that I can cleanly close the file for maintenance. NET SESSION doesn't show the names of open files and NET FILE doesn't show the client which has the file open. I had hoped that I could cross-reference the data from these two commands, but that doesn't seem doable. Everything else I've see provides the same data as these commands, with no apparent way to determine which client machine has the file open.

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  • slave dns server, resolv.conf configuration

    - by Tim the Enchanter
    I have two servers (a master and slave) running DNS (bind). What should the /etc/resolv.conf file look like for the master and the slave? For example should the servers running the DNS have only : nameserver 127.0.0.1 or should they refer to the I.P. addresses of each server, as the other servers on the network do : search <mydomain>.co.uk nameserver 192.168.1.52 nameserver 192.168.1.57

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  • Can I connect two routers to one switch?

    - by vanneto
    I want to connect two routers to a switch which will then be connected to a modem. Now as far as I know a switch does not do network translation and this won't work with one IP address. So I bought two addresses at my ISP. Attached is a simple schematic that explains what I want to do. Is there any additional configuration needed on either of the routers (Linksys WRT54GL) to make this work or will it "Just Work"?

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  • DNS server setting resets on reboot

    - by Vaibhav Bajpai
    I recently changed my physical location, and had to change my DNS server setting in network preferences. However my Mac reverts back to original DNS server IP address on each reboot and I have to manually change it everytime. How can I make my changes persist on reboot? I am running Snow Leopard 10.6.7 UPDATE This is has started to occur since the time I restored my entire system from TM backup.

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  • Mysterious visitor to hidden PHP page

    - by B. VB.
    On my website, I have a "hidden" page that displays a list of the most recent visitors. There exist no links at all to this single PHP page, and, theoretically, only I know of its existence. I check it many times per day to see what new hits I have. However, about once a week, I get a hit from a 208.80.194.* address on this supposedly hidden page (it records hits to itself). The strange thing is this: this mysterious person/bot does not visit any other page on my site. Not the public PHP pages, but only this hidden page that prints the visitors. It's always a single hit, and the HTTP_REFERER is blank. The other data is always some variation of Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.2.0; FunWebProducts; .NET CLR 1.1.4322; SpamBlockerUtility 4.8.4; yplus 5.1.04b) ... but sometimes MSIE 6.0 instead of 7, and various other plug ins. The browser is different every time, as with the lowest-order bits of the address. And it's just that. One hit per week or so, to that one page. Absolutely no other pages are touched by this mysterious vistor. Doing a whois on that IP address showed it's from the new york area, and from the "Websense" ISP. The lowest order 8 bits of their address are always different, but always from 208.80.194.*/8. From most of the computers that I access my website, doing a tracerout to my server does not contain a router anywhere along the way with the IP 208.80.*. So that rules out any kind of HTTP sniffing, I might think. I have NO idea how, why this is happening. Does anyone have any clue, or have seen something as strange as this before? It seems completely benign, but unexplainable and a little creepy. Thanks in advance!

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  • Exchange Server Address Resolving to Random String

    - by William
    I am running Exchange 2013 on Windows Server 2012 R2. When I add my exchange account to Outlook, it seems to work perfectly (sending/receiving email, syncing everything), but when I open the account settings it has the following set as the Server: [email protected] I would have expects this to be: mail.domain.com since this is the DNS A record pointing to the IP of my server. Where is it getting this server name?

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  • Dns server: how can I configure a dns server to track down a pc name in a dhcp enviroment?

    - by Pitto
    I have a dhcp in my home and I would like to setup a dns server too. I would like to implement a linux solution but I think I can't get hands on without understanding - very superficially - if I can achieve such result. My pc (hostname: test) gets a 192.168.1.7 from dhcp. Its dns server is my router (192.168.1.1). How can the router relate my ip change (as soon as the lease is over) to my hostname?

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  • NGINX: dynamic locations stored in DB

    - by chimpanzee
    Is there a possibility to store nginx locations in DB instead of the config to serve them dynamically? The task is to create dynamic URLs for video files based on user's IP and video ID. The idea is when the user visits my website such an dynamic URL is created and added to the db as a new nginx location that exists just for this user and not for others. Or nginx doesn't fit my task and I need to use another tool? Thanks.

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  • No internet connection with Cisco VPN

    - by Macros
    I have a VPN connection set up using the Cisco VPN Client, and whenever I connect to it I lose my internet connection. This is the first time I have used this software, all previous VPNs I have used have been setup through Windows and I can uncheck the 'use remote gateway' box in the TCP-IP properties box to get around this. Is there a similar option in the Cisco Client that I am missing? I am running on Windows 7 32 bit

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  • Linux Startup Script + add one command

    - by Adam
    I need one command line to run at startup. I've tested the command (it re-assosiates an Amazon IP to a Linux Server) and the command run successfully. Just need to know the best method to execute this on server reboot? The server is RedHat and I've read a bit about /etc/init.d but still unsure. command is: ec2-associate-address -v -i i-xxx xxx.xxx.xxx.xxx --region ap-southeast-1 -O key -W secret

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