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• Difference between tcp recv buffer and tcp receive window size?

  - by pradeepchhetri

  The command shows the tcp receive buffer size in bytes. $ cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 4001344 where the three values signifies the min, default and max values respectively. Then I tried to find the tcp window size using tcpdump command. $ sudo tcpdump -n -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80 and host google.com' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 16:15:41.465037 IP 172.16.31.141.51614 > 74.125.236.73.80: Flags [S], seq 3661804272, win 14600, options [mss 1460,sackOK,TS val 4452053 ecr 0,nop,wscale 6], length 0 I got the window size to be 14600 which is 10 times the size of MSS. Can anyone please tell me the relationship between the two.

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• busybox does not display the throughput value at the end of a FTP session?

  - by rockyurock

  Hello, why busybox does not display the throughput value at the end of a FTP session? Or it is some version specific ? i heard that some version of busybox displays Tput value at the end of data transfer but i know that specific version .. i typed the below command but i did not get any throughput status.. "busybox ftpget -v -u user -p Password ip abc.txt abc.txt" could anybody please let me know how can i get the tput value for UL/DL data transfer? Also how can we get the status of Tput value at the client side if we do busybox ftpput operation?? regds rocky

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• Best Performing Remote Desktop Software for WAN

  - by Dave

  I've been tasked with connecting a computer in one of our branches in the midlands to one in south wales. We have been using windows remote desktop but find it too slow. The ADSL on the computer were connecting to is about 6Mb Download and 470Kb Upload so not majorly fast. That connection is also shared with about 10 other internet users. I'm trying to find out if the is any remote desktopn connecting software that performs better than the microsoft remote desktop software. Or, would i be better using a KVM over IP? I've looked into connecting the offices through BT's fiber optic but at £21k a year rental were trying to find a cheaper solution! Any help would be great. Thanks, Dave,

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• Windows refuses to believe printer is online unless I delete and re-add it

  - by Marcin

  I have a Canon MP560. It is online, in the sense that (a) I can connect to its internal web server; and (b) if I delete the printer in windows (windows 7), and reinstall it, windows will recognise that the printer is online, and talk to it. In all other cases, the windows and mac computers (purchased last week, running whatever is the latest and greatest mac os) in my household will simply not recognise that the printer is online. The printer is statically configured to use the same IP address, so that's not an issue. Because the printer works just fine with windows after delete and re-add, I assume that the issue with the mac is that I haven't installed whatever drivers Macs need to talk to Canon printers over a network.

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• Survey for OS/Browsers etc for an external Agency.

  - by ggonsalv

  We need to design an browser application accessed by a fixed set of external entities (providers). I was wondering if there is a pre-existing survey that is 1) Online 2) Determines the browsers being used etc. without the users having to type it in 3) Determine connectivity from IP address. (Like how Speedtest.com does ). It can tell what your ISP is ,etc without having the user fill it in. The ability to add other questions. So basically a recipient of the survey would navigate to the site, the survey questions that can be inferred , are prefilled so as make recipient only answer the non-technical questions of the survey.

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• Nginx Rate Limiting by Referrer?

  - by SteveEdson

  I've successfully set up rate limiting on IP addresses like so, limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; But I was wondering if its possible to do the same on referrers? For example, if a site gets placed in an iframe on a third party site, which generates too much traffic to handle. I can't find any nginx variables for the referrer anywhere. Is this possible? Or can the solution be achieved in a different way? Thanks.

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• Massive Crawling requests from Google Apps Engine useragent

  - by SilentPlayer

  Hi friends, I'm badly affected with 'Google AppEngine-Google' UserAgent.. receiving 5/6 requests per second on http server. This bot is crawling my site just like GoogleBot does. Following is the sample of url in my access logs. 72.14.192.3 - - [19/May/2010:01:27:06 +0000] "GET /some-url/etc-123.htm HTTP/1.1" 200 4707 "-" "AppEngine-Google; (+http://code.google.com/appengine; appid: harpy000)" I have checked the ip address it is registered with Google Inc. Can anyone tell me where i can report Abuse to Google Inc. Or any information about this issue. Thank you!

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• AWS EC2: How to determine whether my EC2/scalr AMI was hacked? What to do to secure it?

  - by Niro

  I received notification from Amazon that my instance tried to hack another server. there was no additional information besides log dump: Original report: Destination IPs: Destination Ports: Destination URLs: Abuse Time: Sun May 16 10:13:00 UTC 2010 NTP: N Log Extract: External 184.xxx.yyy.zzz, 11.842.000 packets/300s (39.473 packets/s), 5 flows/300s (0 flows/s), 0,320 GByte/300s (8 MBit/s) (184.xxx.yyy.zzz is my instance ip) How can I tell whether someone has penetrated my instance? What are the steps I should take to make sure my instance is clean and safe to use? Is there some intrusion detection techinque or log that I can use? Any information is highly appreciated.

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• Squid: problem with FTP service (Windows Server)

  - by Diego

  I followed the instructions on this question and everythig works fine. I have an DHCP server that assigns "IP client" without gateway. Internet with IE or Firefox Browser works but FTP service doesn't work. In squid.conf I have put a line: acl Safe_ports port 80 21 443 389 5307 8080 3144 8282 88 8443 20443 11438 1443 8050 30021 10443 4747 4774 1384 Have I to put gateway in DHCP Server? Have you any suggestion for me? Thanks for your help!

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• VM can't connect to outside in bridged mode

  - by Kamal

  Hi Guys, I am not able to ping any machine(not even the host) from Guest VM in bridged mode. But I got an IP which is on the same subnet as host. I can ping my guest VM from the host and can use ssh to connect to the guest. I am using Vmware workstation 6.5. Guest VM is a centos VM and host is windows xp. Every thing works fine in NAT mode. Any clues as to what could be happening. I tried disabling all the firewalls I have.

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• Tomcat 5.5 - multiple contexts using same path

  - by ctn8iv

  Is it possible to set up multiple contexts using the same path? For example: <Context docBase="/www/websites/site1/java/base" path="/base" reloadable="true"/> <Context docBase="/www/websites/site2/java/base" path="/base" reloadable="true"/> I have two sites that use the same path both running on the same server/IP. The sites use different virtual hosts and different ServerNames, but I have no control over the directory structure of the sites because they are maintained by a client. Until now, they have been content with only allowing one site to run at a time, but this is a major hassle, so I need to know if there's a workaround.

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• D-Link DNS-323 NAS firmware update

  - by Mark Beaton

  Hi all, I've got a D-Link DNS-323 NAS enclosure holding a bunch of multimedia files that I've (possibly stupidly) just updated the firmware on, from 1.03 to 1.08. The updater indicated it applied the firmware patch successfully, but after rebooting it I can no longer get into it via the web interface, either via the static IP I had assigned it before the update, or by any of the DHCP-assigned addresses that I can see are currently assigned by my router. The unit just sits there, with the drives (2x512 set up as RAID-1) thrashing away seemingly forever... So, my question - has anyone had a similar experience with one of these units? Any advice etc? I've googled the hell out of it, and can't find anything useful.

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• Web service not accessible from behind corporates firewalls - how come?

  - by Niro

  We run a Saas serving a widget which is embedded in customer websites. The service include static javascript code hosted on amazon S3 and dynamic part hosted on EC2 with Scalr (using scalr name servers). We received some feedback from users behind corporate firewalls that they cant access our service (while they can access the sites including the widget). This does not make sense to me since the service is using normal http calls on port 80 and our URL is quite new without any reason to be banned by firewalls. My questions are: 1. Why is the service is not accessible and what can I do about it? 2. Is it possible that one of the following is blocked by corporate firewalls: Amazon s3, the dynamic IP address provided by amazon, Scalr name servers. Any other possible reasons, way to check them and remedies for this? Thanks!

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• MySQL on Windows - how do I set the wait_timeout for connections using named pipes?

  - by gustafc

  I use a MySQL database running on a Windows box, and for performance reasons I'm connecting to it using named pipes. The (Java) application using the database (through Hibernate) can let the connection lie idle for quite a long time, which causes the connection to fail with the following message: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 33 558 297 milliseconds ago. The last packet sent successfully to the server was 33 558 297 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. autoReconnect unfortunately has no effect (and neither does autoReconnectForPools), but the wait_timeout docs state that wait_timeout only applies "to TCP/IP and Unix socket file connections, not to connections made via named pipes, or shared memory". How can I change the wait_timeout for named pipes?

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• Smart subdomain routing via reverse proxy

  - by Trevor Hartman

  I have two servers on my home network: OSX Server and an Ubuntu Server. I'd love to have external subdomains osx.mydomain.com point to osx and ubuntu.mydomain.com point to ubuntu. I know the normal way to do this is to have a static external IP address for each, but that's not an option as this is just my home setup. My question is: is there a way to do this with some reverse proxy trickery? OSX is currently the default entry point for all traffic. I was able to setup a reverse proxy on OSX for ubuntu.mydomain.com on port 80, so web traffic was correctly being proxied to my ubuntu. I'd like to ssh and do a bunch of other stuff though!

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• Cisco, How to do a subnetting scheme using VLSM and RIP-2?

  - by Andrei T. Ursan

  I'm studying for my CCNA exam and I have to create a VLSM scheme using RIP-2 for the following requirements: (this is an exercise) Use the class C network 192.168.1.0 network for your point-to-point connections Using the Class A network 10.0.0.0, plan for the following number of hosts in each location: New York: 1000 Chicago: 500 Los Angeles: 1000 On the LAN and point-to-point connections, select subnet masks that use the smallest ranges of IP addresses possible given the above requirements. In all cases, use the lowest possible subnet numbers. Subnet zero is allowed. My guess is the following: New York: S0/0 192.168.1.1 /24 Fa0/0 10.1.0.1 netmask 255.255.248.0 - because we need 1000 hosts Chicago: S0/0 192.168.1.2 /24 Fa0/0 10.2.0.1 netmask 255.255.252.0 (for 500 hosts) Los Angeles: S0/0 192.168.2.3 /24 Fa0/0 10.3.0.1 netmask 255.255.248.0 (for 1000 hosts) Is this a good configuration? I'm reading the CCNA book but not everything is very clear, so I said to do some exercises... Thank you!

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• How can I connect to a CIFS/SMB share on a non-default port?

  - by fsckin

  I'm trying to get a contractor connected to a CIFS share (port 445). He's not a big shop (so no go on using VPN). His ISP blocks outgoing connections on port 445. I've been doing some rsync to ftp madness as a workaround to have the share available to him, but it's getting out of control -- we're syncing nearly 40GB a day to an external ftp site and it's going to be much easier just to have him connect and only grab the stuff he needs. So... I can have the CIFS share open to the internet (filtered to allow access to his IP only) on port 446. How the heck can he connect to that? I looked through "net use" and didn't see anything about using another port.

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• PTR Record for host in VLSM subnet

  - by paradroid

  I understand that this is the way a PTR record would be made on a Class A subnet (10.100.250.100 255.0.0.0) dnscmd /RecordAdd 10.in-addr.arpa. 100.250.100 PTR host.domain.tld To clarify the syntax, this is what it should be for a Class C subnet (192.168.1.100 255.255.255.0) dnscmd /RecordAdd 1.168.192.in-addr.arpa. 100 PTR host.domain.tld Is that right? Now how do I do this for a host with the IP address 172.31.111.210 on a 172.31.111.192/26 network? I'm not sure how to do this with a classless subnet mask.

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• Hyper-V Server hvremote.wsf Script - ns lookup for DNS Verification test fails

  - by Vazgen

  I'm trying to connect my Hyper-V Server to a Windows 8 client for remote management. I have: Joined server to WORKGROUP Enabled Remote Management Set the server name Set a static IP Set the DNS servers to my ISPs DNS Servers (same as default DNS Servers on my Windows 8 remote management client) Set the correct time zone Created net user on server (net user /add admin password) Added user to special Administrators group on server (hvremote /add:admin) Granted anonymous dcom access on client using hvremote However, the "ns lookup for DNS verification" fails on both the client and server with the same error: Server: my.isps.server.name.net Address: 111.222.333.1 *** my.isps.server.name.net can't find 192.168.1.3: Non-existent domain Thanks for the help.

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• Nginx. How do I reject request to unlisted ssl virtual server?

  - by Osw

  I have a wildcard SSL certificate and several subdomains on the same ip. Now I want my nginx to handle only mentioned server names and drop connection for others so that it'd look like nginx is not running for unlisted server names (not responding, rejecting, dead, not a single byte in response). I do the following ssl_certificate tls/domain.crt; ssl_certificate_key tls/domain.key; server { listen 1.2.3.4:443 ssl; server_name validname.domain.com; // } server { listen 1.2.3.4:443 ssl; server_name _; // deny all; // return 444; // return 404; //location { // deny all; //} } I've tried almost everything in the last server block, but no success. I get either valid response from known virtual server or error code. Please help.

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• Error while setting up Anywhere Access on Windows Server 2012 Essential (personalized domain name from Microsoft)

  - by Thomas

  I am trying to setup Anywhere Access on a Windows Server 2012 Essential Release Candidate, but keep getting this error: "The domain name was not setup for your server. Wait a few minutes and run the wizard again. An unknown error occurred. Please wait a few minutes and then try again". These are the options that I selected in the Wizard: I want to set up a new domain name Get a personalized domain name from Microsoft Entered my Windows live id and password xxxx.remotewebaccess.com And on the next page the error is displayed. I have setup my router (Linksys WRT160N) to forward all TCP traffic to the Server. UPnP is also enabled. If I hit my public (dynamic) IP (http://188.182.194.182/) I get the Windows Server 2012 homepage. Any ideas?

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• Plesk 9 VPS - Doesn't reply to NameServer requests (nslookup, etc)

  - by Ben

  Hi, I'm trying to troubleshoot a problem with a new VPS i'm setting up. The VPS is running Plesk 9 on a CentOS 5 system. Everything works fine, except it doesn't serve dns requests. If I try something like nslookup [somedomain.com] the.ser.ver.ip to test a DNS query, i get the following error ;; connection timed out; no servers could be reached I can't telnet to it on port 42 either.. I'm guessing something is blocking the requests.. firewall maybe? the plesk firewall module is installed and the nameservers entry is green. Any other way I can check what's blocking it on the server? Any help/tip greatly appreciated. Note: http works, i can telnet to the server on port 80 and i can also ping the server Thanks

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• Upgrading OpenSSL in CentOS 5.3

  - by Lin

  I want to use one IP to host many domains with individual SSL certificates (requires SNI). In CentOS 5.3, the latest version of OpenSSL I can find an RPM for is 0.9.8e, which does not support SNI. I want to upgrade to 0.9.8k but I can't find an RPM. I could compile from source, but if I try to remove the existing OpenSSL package through yum, it wants me to remove all packages that depend on OpenSSL (100+ packages). EDIT: I ended up installing 0.9.8k without overwriting the previous version. Now I both avoid breaking dependencies and can use SNI. Was this the best action?

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• Cannot connect to a VPN server - authentication failed with error code 691

  - by stacker

  When trying to connect to a VPN server, I get the 691 error code on the client, which say: Error Description: 691: The remote connection was denied because the user name and password combination you provided is not recognized, or the selected authentication protocol is not permitted on the remote access server. Now, I validated that the username and password are correct, and tried to login with domain name and without. I also installed a certification to use with the IKEv2 security type. I also validated that the VPN server support security method. But I cannot login. In the server log I get this log: Network Policy Server denied access to a user. The user DomainName\UserName connected from IP address but failed an authentication attempt due to the following reason: The remote connection was denied because the user name and password combination you provided is not recognized, or the selected authentication protocol is not permitted on the remote access server. Any idea of what can I do? Thanks in advance!

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• What is the meaning of these BIND log messages?

  - by javano

  Please clarify for me the meaning of the following BIND messages in syslog, these are from a DNS resolver. Whilst I think I understand them, I don't know what all four mean, so I think it's best if someone will clarify for me: 1. Oct 14 18:36:34 resolver1 named[14958]: lame server resolving 'arrivatn.co.uk' (in 'arrivatn.co.uk'?): 212.103.224.56#53 2. Oct 14 18:36:36 resolver1 named[14958]: unexpected RCODE (SERVFAIL) resolving '148.128.183.212.in-addr.arpa/PTR/IN': 212.183.136.42#53 4. Oct 14 18:38:49 resolver1 named[14958]: unexpected RCODE (REFUSED) resolving 'internal-server.ournetwork.com/AAAA/IN': auth.dns.server.ip#53 3. Oct 14 18:39:05 resolver1 named[14958]: client 89.187.127.110#42034: query (cache) 'image.sinajs.cn/A/IN' denied Thank you.

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