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• Track IP Messenger's chatting by wireshark

  - by Kumar P

  We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. Now my client machines using IP messenger for chatting and sharing files with in local network. How can i trace what they are doing or chatting by ip messenger, from my server by wireshark packet sniffer ? If i can't do it by wireshark , What will you give idea about it...

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• ipv6 : why ndp resolves to global scope address?

  - by Julien

  I'm facing a strange ipv6 behavior and I don't know how to solve it because I'm not familiar with ipv6. Maybe this behavior is normal. I hope that you will help me. ( I'm running under debian 6.0.9 with a custom kernel 3.2.58 ) machine A is "2a00:7d30:edf6:100::1" wants to ping machine B, which is "2a00:7d30:edf6:100::10". Both are on the same segment. machine A asks for the address of machine B and I don't understand why machine B gives its global scope address instead of the local scope one ? 10:59:02.082785 IP6 2a00:7d30:edf6:100::1 ff02::1:ff00:10: ICMP6, neighbor solicitation, who has 2a00:7d30:edf6:100::10, length 32 10:59:02.082821 IP6 2a00:7d30:edf6:100::10 2a00:7d30:edf6:100::1: ICMP6, neighbor advertisement, tgt is 2a00:7d30:edf6:100::10, length 32 after that machine A pings the global scope address of machine B and it works fine : 10:59:02.082927 IP6 2a00:7d30:edf6:100::1 2a00:7d30:edf6:100::10: ICMP6, echo request, seq 1, length 64 10:59:02.082960 IP6 2a00:7d30:edf6:100::10 2a00:7d30:edf6:100::1: ICMP6, echo reply, seq 1, length 64 Thank you for you help best regards Julien

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• Subdomains and address bar

  - by Priednis

  I have a fairly noob question about how subdomains work. As I understand at first the DNS server specifies that a request for certain subdomain.domain.com has to go to the IP address of domain.com, and the webserver at domain.com further processes the request and displays the needed subdomain page. It is not entirely clear to me how (for example Apache) server does it. As I understand there can be entries in vhosts.conf file which specify folders that contain the subdomain data. Something like: <VirtualHost *> ServerName www.domain.com DocumentRoot /home/httpd/htdocs/ </VirtualHost> <VirtualHost *> ServerName subdomain.domain.com DocumentRoot /home/httpd/htdocs/subdomain/ </VirtualHost> and there also can be redirect entries in .htaccess files like rewritecond %{http_host} ^subdomain.domain.com [nc] rewriterule ^(.*)$ http://www.domain.com/subdomain/ [r=301,nc] however in this case the user gets directed to the directory which contains the subdomain data but the user gets "out" of the subdomain. I would like to know - how, when going to subdomain.domain.com the subdomain.domain.com, beginning of address remains visible in the address bar of the explorer? Can it be done by an alternate entry in .htaccess file? If a VirtualHost entry is specified in the vhosts.conf file, does it mean, that a new user account has to be specified for access to this directory?

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• Apache server in raspberry PI not visible from outside( public IP)

  - by Kronos

  I have made a fresh install of Arch Linux ARM into a Raspberry PI and I mounted there a LAMP, all fresh. I have another Arch(x86) in my laptop with Apache also there, and as far as I know, two web servers cannot run in the same network segment so, the problem is as follows. I my laptop, having Apache running, if I enter via the public ip of my network everything turns ok and I can see my website but, (obviously turning this server down) if I enter from the public IP with the Apache running in the raspberry pi( yes, only that Apache running) i cannot see my website in there. Also, if I access via local network it is a normal success, I can see my website. So, I can enter my raspberry website only via local but in my other web server i can enter it via local and public. I have the same conf files in both of them so what is the difference? I was planning in making the rpi as a development server. Thanks in advance

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• How to run node.js app on port 80? Are processes blocking my port?

  - by Lucas

  I believe the port 80 on my remote instance is blocked, and I am trying to run a node.js app using port 80. I have experimented with ports 3000 and 3002, and both ports are working fine, but I get an error when running on port 80. I suspect port 80 is blocked from my output of netstat -an below, but how can I find the process id's of the addresses that are blocking port 80 below? [lucas@ecoinstance]~/node/nodetest1$ netstat -an Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:3002 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:27017 127.0.0.1:51108 ESTABLISHED tcp 0 0 127.0.0.1:51106 127.0.0.1:27017 ESTABLISHED tcp 0 0 127.0.0.1:27017 127.0.0.1:51106 ESTABLISHED tcp 0 0 127.0.0.1:51107 127.0.0.1:27017 ESTABLISHED tcp 0 0 10.240.241.116:3002 174.61.171.61:36583 TIME_WAIT tcp 0 0 127.0.0.1:27017 127.0.0.1:51109 ESTABLISHED tcp 0 0 10.240.241.116:42423 169.254.169.254:80 ESTABLISHED tcp 0 0 127.0.0.1:51108 127.0.0.1:27017 ESTABLISHED tcp 0 532 10.240.241.116:22 174.61.171.61:56824 ESTABLISHED tcp 0 0 127.0.0.1:27017 127.0.0.1:51107 ESTABLISHED tcp 0 0 10.240.241.116:42412 169.254.169.254:80 ESTABLISHED tcp 0 0 127.0.0.1:51109 127.0.0.1:27017 ESTABLISHED tcp 0 0 127.0.0.1:51105 127.0.0.1:27017 ESTABLISHED tcp 0 0 10.240.241.116:42422 169.254.169.254:80 TIME_WAIT tcp 0 0 127.0.0.1:27017 127.0.0.1:51105 ESTABLISHED tcp6 0 0 :::22 :::* LISTEN udp 0 0 0.0.0.0:49948 0.0.0.0:* udp 0 0 0.0.0.0:68 0.0.0.0:* udp 0 0 10.240.241.116:123 0.0.0.0:* udp 0 0 127.0.0.1:123 0.0.0.0:* udp 0 0 0.0.0.0:123 0.0.0.0:* udp6 0 0 :::12151 :::* udp6 0 0 :::123 :::* Active UNIX domain sockets (servers and established) Proto RefCnt Flags Type State I-Node Path unix 2 [ ACC ] STREAM LISTENING 405680 /tmp/ssh-KdkxJfFLpKTC/agent.22 813 unix 2 [ ACC ] STREAM LISTENING 408230 /tmp/ssh-ofUeNNEwAqtP/agent.22 243 unix 2 [ ACC ] STREAM LISTENING 416227 /tmp/mongodb-27017.sock unix 2 [ ACC ] SEQPACKET LISTENING 3692 /run/udev/control unix 7 [ ] DGRAM 5286 /dev/log unix 2 [ ACC ] STREAM LISTENING 5318 /var/run/acpid.socket unix 2 [ ACC ] STREAM LISTENING 16170 /tmp//tmux-1000/default unix 2 [ ACC ] STREAM LISTENING 414450 /var/run/dbus/system_bus_socke And here is the log when trying to run on port 80 with node.js: [lucas@ecoinstance]~/node/nodetest1$ npm start > [email protected] start /home/lucas/node/nodetest1 > node ./bin/www events.js:72 throw er; // Unhandled 'error' event ^ Error: listen EACCES at errnoException (net.js:904:11) at Server._listen2 (net.js:1023:19) at listen (net.js:1064:10) at Server.listen (net.js:1138:5) at Function.app.listen (/home/lucas/node/nodetest1/node_modules/express/lib/applicati on.js:532:24) at Object.<anonymous> (/home/lucas/node/nodetest1/bin/www:7:18) at Module._compile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) npm ERR! [email protected] start: `node ./bin/www` npm ERR! Exit status 8 npm ERR! npm ERR! Failed at the [email protected] start script. npm ERR! This is most likely a problem with the nodetest1 package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! node ./bin/www npm ERR! You can get their info via: npm ERR! npm owner ls nodetest1 npm ERR! There is likely additional logging output above. npm ERR! System Linux 3.13-0.bpo.1-amd64 npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "start" npm ERR! cwd /home/lucas/node/nodetest1 npm ERR! node -v v0.10.28 npm ERR! npm -v 1.4.9 npm ERR! code ELIFECYCLE npm ERR! npm ERR! Additional logging details can be found in: npm ERR! /home/lucas/node/nodetest1/npm-debug.log npm ERR! not ok code 0 And sudo netstat -lnp does not return any matching port 80's: [lucas@ecoinstance]~/node/nodetest1$ sudo netstat -lnp [48/648] Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Progr am name tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 29160/mon god tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1976/sshd tcp6 0 0 :::22 :::* LISTEN 1976/sshd udp 0 0 0.0.0.0:49948 0.0.0.0:* 1604/dhcl ient udp 0 0 0.0.0.0:68 0.0.0.0:* 1604/dhcl ient udp 0 0 10.240.241.116:123 0.0.0.0:* 2076/ntpd udp 0 0 127.0.0.1:123 0.0.0.0:* 2076/ntpd udp 0 0 0.0.0.0:123 0.0.0.0:* 2076/ntpd udp6 0 0 :::12151 :::* 1604/dhcl ient udp6 0 0 :::123 :::* 2076/ntpd Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 2 [ ACC ] STREAM LISTENING 405680 22814/ssh-agent /tmp/ssh-K dkxJfFLpKTC/agent.22813 unix 2 [ ACC ] STREAM LISTENING 408230 24049/ssh-agent /tmp/ssh-o fUeNNEwAqtP/agent.22243 unix 2 [ ACC ] STREAM LISTENING 416227 29160/mongod /tmp/mongo db-27017.sock unix 2 [ ACC ] SEQPACKET LISTENING 3692 284/udevd /run/udev/ control unix 2 [ ACC ] STREAM LISTENING 5318 1798/acpid /var/run/a cpid.socket unix 2 [ ACC ] STREAM LISTENING 16170 5177/tmux /tmp//tmux -1000/default unix 2 [ ACC ] STREAM LISTENING 414450 28213/dbus-daemon /var/run/d bus/system_bus_socket unix 2 [ ACC ] STREAM LISTENING 404225 22324/1 /tmp/ssh-9 TlDmu4bjl/agent.22324

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• acessing a subnetwork from within a vm

  - by yan bellavance

  I have a pc running windows 7. I have vmwareplayer running RHEL5 I have 1 physical ethernet connection. this ethernet connection is wired to a hub. there is another device on that hub that needs to be in a certain subnetwork (192.168.0.xxx)(lets call him device X) but the general network is 192.168.1.xxx How can I configure the network adapters so that I can ping device X from RHEL5 in the vm. Originally I could ping google from both windows and rhel (I was in the .1 network) but not device X since he is on a different subnetwork address. Now that I have put it on the .0 I can ping device X from windows but not from rhel5 and cannot access the web. I did this by manually setting the IP address.

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• Does IP helper forward subnet broadcasts?

  - by Eamon

  Hi, I have a device on a VLAN that uses UDP subnet broadcasts to advertise its presence to similar devices. This works fine on a single VLAN, but now I need to allow it to communicate with similar devices on a second VLAN. I thought of using the IP helper command in the router, but I am wondering if that only forwards global broadcasts (255.255.255.255)? My device sends out a subnet broadcast (e.g. 192.168.6.255) Will IP helper change the destination address to the target subnet (e.g. 192.168.7.255)? Eamon

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• Gathering IP's from a complicated log

  - by Harry

  I have a question regarding the use of some more advanced grep, awk, sed. I have a log file, for a proprietary MTA, that contains IP's in a string, delimited by [redacted]^~x.x.x.x^[redacted]. So far all of my grepping, awking, and sedding hasn't gotten me very far. This log file has 331520 lines in it. My goal was to simply grep out the ip's, then do a for loop with sed, to sed 's/$i/redacted'. I'm including a sample of one of the log entries. If you all have any idea, I would be greatly appreciative. Jun 4 15:21:52 host.name mta-name: 13388^~88/CC-04671-FCA0DCF4^~D^~<redactedmessageid>^~@^[email protected]^~redacted.hostname^~000.00.000.000^~port^~esmtp^~^~external_routing_nobounce^~0^~0.51^~subjectofmessage^~250 2.6.0 <redactedmessageid> [InternalId=2178458] Queued mail for delivery

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• DHCPD Offering ip address on wrong subnet

  - by Logan

  I just recently added a new subnet for our wireless network to our DHCP configuration for the 192.168.254.0 subnet. Most of the time when wireless clients connect it works just fine. However, sometimes on seemingly random occasions the DHCP server will send out a DHCPOFFER with an IP address on the wrong subnet. Example: dhcpd: DHCPDISCOVER from MACADDRESS (ThinkBook2) via 192.168.254.1 dhcpd: DHCPOFFER on 192.168.22.236 to MACADDRESS (ThinkBook2) via 192.168.254.1 Here is the subnet configuration in dhcpd.conf: subnet 192.168.254.0 netmask 255.255.255.0 { option routers 192.168.254.1; range 192.168.254.34 192.168.254.254; default-lease-time 14400; authoritative; } How can I make sure the server always sends out an IP address on the right subnet?

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• MySQL Workbench sends computer name with login not IP

  - by Android Addict

  I am attempting to connect MySQLWorkbench to a remote MySQL Server. The server has granted access to user@IPAddress However, when I try to connect MySQLWorkbench, it sends user@computername instead. How do I configure the connection to use the IP address instead in MySQLWorkbench? Reference: The remote server is on the local network, so I need to use the local IP address assigned to my client. EDIT What I have tried so far: from the server: mysql -u user@IPAddress -p --host=(ServerIPAddress) Returns: mysql> So that tells me the user account is operational. Furthermore, I confirmed it exists using: select user from mysql.user; returning a table of all users, of which the user I am using is present. I have also opened the port 3306: sbin/iptables -A INPUT -i eth0 -s clientIPAddress -p tcp --destination-port3306 -j ACCEPT Still I encounter Access Denied

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• Weird DNS bug - external server resolves to internal IP

  - by emilecantin

  I have a server that is hosted by my university. I have root access, but no control over network setup, firewall, etc. This server's DNS resolves to an internal IP here on campus (10.x.x.x), and an external IP outside campus. I also have a few servers hosted at Amazon, and they mostly work well. However, one of them started to resolve the university server by its internal IP address. This causes problems, as 10.x.x.x on Amazon EC2 is someone else. I have connected to the Amazon server with SSH agent forwarding a few times in the past, to access a Git repository on the university server. Any idea what could cause this? EDIT: Here's my /etc/resolv.conf # Generated by dhcpcd for interface eth0 search ec2.internal nameserver 172.16.0.23 Here's the output of dig myserver.myuniversity.ca.: ; <<>> DiG 9.8.1-P1 <<>> myserver.myuniversity.ca. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34470 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;myserver.myuniversity.ca. IN A ;; ANSWER SECTION: myserver.myuniversity.ca. 537586 IN A 10.43.x.x ;; Query time: 2 msec ;; SERVER: 172.16.0.23#53(172.16.0.23) ;; WHEN: Wed Nov 28 16:07:21 2012 ;; MSG SIZE rcvd: 60 Here's the expected output (on another Amazon server): ; <<>> DiG 9.8.1-P1 <<>> myserver.myuniversity.ca. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8045 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;myserver.myuniversity.ca. IN A ;; ANSWER SECTION: myserver.myuniversity.ca. 601733 IN A x.x.239.1 ;; Query time: 1 msec ;; SERVER: 172.16.0.23#53(172.16.0.23) ;; WHEN: Wed Nov 28 16:09:36 2012 ;; MSG SIZE rcvd: 60

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• VPN Error 868 when connecting even if using IP address

  - by Fr33dan

  I am trying to connect to a public VPN from VPNGate. However when I attempt to connect to a VPN from the list using MS-SSTP protocol I get the following error: Error 868: The remote connection was not made because the name of the remote access server did not resolve. If I open a command prompt and ping the address in question it resolves to the IP shown on the listing. If I configure the VPN using that IP address directly I still receive the error even though the name no longer needs to resolve. This was working yesterday but it seems the VPN I was using has been removed from the list. What is happening and how can I fix it?

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• IIS Seems to Forward Domain/IP to Domain Controller

  - by asinc

  We have a server (Server 1) with Win 2008 that is accessible by RDP and also is set as the primary DNS IP for a domain (example.com). This server is on the same network as an SBS 2008 server (Server 2) which is the domain controller and internal Dns server. Web requests going to example.com with IP of Server 1 are being passed to Server 2 and served up by IIS from Server 2. What causes this to happen? Is there a safe way to have Server 1 IIS handle the web requests which was our expected outcome? Example: DNS entry on ISP: example.com = 111.111.111.111 Server 1 = 111.111.111.111 Server 2 = 111.111.111.112 Web user goes to example.com in browser, and the page is actually returned from 111.111.111.112?

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• How to setup heartbeat for IP fail over on SSH failure

  - by Tony

  I wonder if anyone can help me, I am trying to setup heartbeat on a redhat 5 to failover an IP address when ssh stops responding on a server. So basically you ssh to a VIP and then get put through which ever server has the floating ip. 192.168.0.100 | | /------------------------\ | /------------------------\ | Server 01 | | | Server 02 | | eth0 - 192.168.0.1 |-----/ | eth0 - 192.168.0.2 | | eth0:0 - 192.168.0.100 | | eth0:0 - down | \------------------------/ \------------------------/ if ssh stops responding i want eth0:0 to be brought up on the second machine to allow ssh connections to carry on being served. I have tried to follow some documents I have found online so here is my current configuration: ha.cf bcast eth0 keepalive 2 warntime 10 deadtime 30 initdead 120 udpport 694 auto_failback off node vm-bal01 node vm-bal02 debugfile /var/log/ha-debug logfile /var/log/ha-log authkeys auth 1 1 sha1 sshhhsecret1234 haresources server01 192.168.0.100/24/eth0:0/192.168.0.255 Hope someone can help as this is driving me nuts...

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• Metro Apps on Win 8 aren't working with static ip behind auth proxy

  - by Kamal

  In Windows 8 Professional, Metro Apps and Windows Update do not work on static IP settings behind authenticated proxy server. They work on DHCP on the same proxy settings. (We have DHCP for wifi and static IP for LAN, both using the same proxy server). IE, Chrome and other desktop apps work nicely on both. Metro apps worked on an auth proxy (DHCP only), when I changed their proxy settings from the 'edit group policy' option. (StartSettingsEdit Group PolicyComputer ConfigurationAdministrative TemplatesNetwork IsolationInternet Proxy for Apps) Can this be fixed?

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• Get sessions' remote IP from Teamviewer log file

  - by etuardu

  I'd like to know who has logged in to my machine and when. I have two TeamViewer log files: Connections_incoming.txt and TeamViewer7_Logfile.log. The first one is quite plain and lists, as its name says, the incoming connections to the machine, reporting the local name of the remote host, login time, logout time, and some ids. e.g.: 173274362 MYLAPTOP 20-02-2012 17:32:16 20-02-2012 17:50:42 Master RemoteControl {C5AAE483-ED0B-54B8-9235-7AE597CAD342} This is almost all what I need, but unfortunately no remote IP address is reported here, so I checked for IPs in TeamViewer7_Logfile.log but it is really messy. It indeed contains some IP addresses but I can't understand which one is bound with the items in the first log file. Is there a way to interpolate the two logs to get what I need? Should I search the second file for some particular text? What do you suggest?

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• Windows XP SP3 TCP/IP No buffer space available

  - by Natalia

  I have the exactly same problem as here: Windows XP TCP/IP No buffer space available On Windows XP Pro, SP3 if one does an experiment where one tries to open TCP/IP sockets in a loop (bascially, listen port 7000, listen port 7001, etc.) After approx 649 open sockets, one will start getting errors: No buffer space available (maximum connections reached?) I've tried to edit the registry as described here http://smallvoid.com/article/winnt-tcpip-max-limit.html I set MaxUserPort = 65534 and MaxFreeTcbs = 2000, but it didn't help. What else can I do? I need 1000 server sockets. Here is the error stack: 05.04.2012 10:23:57 java.net.SocketException: No buffer space available (maximum connections reached?): listen at sun.nio.ch.ServerSocketChannelImpl.listen(Native Method) at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:127) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:59) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:52) at channelserver.NIOAppServer.initSelector(NIOAppServer.java:40) at channelserver.NIOAppServer.(NIOAppServer.java:27) at channelserver.NIOServer.main(NIOServer.java:433) at channelserver.NIOServer.main(NIOServer.java:438)

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• Sending email with exim and extrnal sender address

  - by Tronic

  hi. i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you!

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• Monitoring whether Google Apps email address is reachable

  - by Acorn

  Backstory: I bungled things a bit the other day, and inadvertantly deleted the DNS overrides for my domain including the MX records that point to Google Apps, causing 2 days of lost emails. What I want: I want to be able to monitor the email address/account so that I can be alerted if for any reason something has gone wrong and emails aren't arriving. Thoughts: I was thinking there might be a way to test the email without having to send an actual message. Does this exist? This wouldn't help if the DNS has reset itself to a different mailserver would it? The other idea was sending periodic emails to check the address it working. How would you automate this? You'd need to somehow check that the email address had arrived as well as checking if it had bounced. Are there any scripts that exist that would do something like this? What would be the best method? Maybe a combination of checking that the MX records for the domain are set to what they're supposed to be set to, and sending automatic test emails to check that things are still functioning on the Google Apps end?

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• Blocking a country (mass iP Ranges), best practice for the actual block

  - by kwiksand

  Hi all, This question has obviously been asked many times in many different forms, but I can't find an actual answer to the specific plan I've got. We run a popular European Commercial deals site, and are getting a large amount of incoming registrations/traffic from countries who cannot even take part in the deals we offer (and many of the retailers aren't even known outside Western Europe). I've identified the problem area to block a lot of this traffic, but (as expected) there are thousands of ip ranges required. My question now (finally!). On a test server, I created a script to block each range within iptables, but the amount of time it took to add the rules was large, and then iptables was unresponsive after this (especially when attempting a iptables -L). What is the most efficient way of blocking large numbers of ip ranges: iptables? Or a plugin where I can preload them efficiantly? hosts.deny? .htaccess (nasty as I'd be running it in apache on every load balanced web server)? Cheers

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• Linux - use dhcp again to get IP

  - by Markus Orreilly

  I had statically set my ip in Linux using: sudo ifconfig eth0 192.168.blah.blah Now I want it to go back to using DHCP to assign the IP. How do I do that? This is what I see when I run dhclient Internet Systems Consortium DHCP Client V3.1.2 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ Listening on LPF/eth0/08:00:27:9b:43:09 Sending on LPF/eth0/08:00:27:9b:43:09 Sending on Socket/fallback DHCPREQUEST of 192.168.56.104 on eth0 to 255.255.255.255 port 67

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• Autodiscover service seems to reply with User Principal Name instead of email address

  - by Jeff McJunkin

  After this latest round of Windows updates (on 1/11/11, in fact) my Exchange 2007 server of course rebooted. This may have had the side effect of making any changes I'd inadvertently made take effect. Since then, the Autodiscover service in Exchange 2007 from Outlook 2007 seems to reply with the User Principal Name ([email protected] instead of [email protected]). I'm specifically seeing this from within the "Test Email AutoConfiguration" tool in Outlook (the UPN appears in the first text box labeled "E-mail") and when creating a new profile in Outlook. If I disregard the UPN and instead fill in my email address, Autodiscover works as expected and I can connect without issue. I've confirmed using ADSI Edit that the SMTP email address is properly set for my users. I even went a bit crazy and set the UPN to the email address using ADSI Edit. I've re-installed the Client Access role on the server in question. Exchange server is Server 2008, 64-bit of course. Clients are mostly XP 32-bit, though the issue happens from a Windows 7 machine as well.

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• Known Hosts ECDSA Host Key Multiple Domains on One IP

  - by Jonah

  Hello, world!, I have a VPS set up with multiple domain names pointing to it. Arbitrarily, I like to access it via SSH through the domain name I'm dealing with. So for example, if I'm doing something with example1.com, I'll log in with ssh [email protected], and if I'm working with example2.com, I'll log in with ssh [email protected]. They both point to the same user on the same machine. However, because SSH keeps track of the server's fingerprint, it tells me that there is an offending host key, and makes me confirm access. $ ssh [email protected] Warning: the ECDSA host key for 'example2.com' differs from the key for the IP address '123.123.123.123' Offending key for IP in /home/me/.ssh/known_hosts:33 Matching host key in /home/me/.ssh/known_hosts:38 Are you sure you want to continue connecting (yes/no)? Is there a way to ignore this warning? Thanks!

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• Sending email with exim and external sender address

  - by Tronic

  i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you! Edit with more details when sending a mail from command line with echo "Test" | mail -s Testmail [email protected] the logs says 2011-01-01 20:45:24 1PZ7OG-0001Vp-Rx <= root@gustav U=root P=local S=360 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx => [email protected] R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [209.85.229.27] X=TLS1.0:RSA_ARCFOUR_MD5:16 DN="C=US,ST=California,L=Mountain View,O=Google Inc,CN=mx.google.com" 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx Completed and i get the mail on my gmail account. but when sending by webapp (when testing locally with sendmail it works fine) i only get this log output 2011-01-01 20:50:08 1PZ7Sq-0001X9-L4 <= <> R=1PZ7Sq-0001X7-Jo U=Debian-exim P=local S=1780 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.3] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 Completed

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