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• VLSM, Rip V1 and Rip V2

  - by uBlankText

  I am trying to understand some things about Rip V1 and V2 but i am not sure if i am right, As i know Rip V1 doesn't "advertise" subnet masks, and doesn't support VLSM. If i understand right Even if Rip V1 for example supports VLSM it doesn't matter, Becouse the Rip V1 Only "advertise" the IP address, If some one can please confirm/expand/correct me I will be very thankful, Thank you all and have a nice day.

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• Windows 3.11 on ESXi4 - network not works

  - by Gabor Garami

  Hi, I migrated my Windows 3.11 for Workgroups from VMware Workstation to ESXi 4.0U1 and the networking inside the guest machine has been stopped working. I reinstalled the network card driver, and changed to use static ip but it doesn't help. Pls help me.

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• nginx connection time issue on some IPs

  - by sheldon

  I have recently shifted my server to nginx and php-fpm getting rid of apache. This has helped improves speeds of my website. Everything seems to work fine until i came across this issue, i noticed that nginx keeps throwing connection time out errors for only certain IPs. One of the IPs is my office IP, we have a backend that is accessed from our office through out the day. I use supervisord to launch 3 php-fpm processes with workers this is my typical php-fpm config pm.max_children = 50 pm.start_servers = 20 pm.min_spare_servers = 5 pm.max_spare_servers = 35 pm.max_requests = 300 Since i have a server with 4 cores and 2 GB ram this is my nginx setup worker_processes 4; worker_rlimit_nofile 8192; events { worker_connections 1024; use epoll; multi_accept off; } sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 55; recursive_error_pages on; server_name_in_redirect off; server_tokens off; client_header_timeout 3m; client_body_timeout 3m; send_timeout 3m; connection_pool_size 256; client_header_buffer_size 8k; large_client_header_buffers 4 32k; request_pool_size 4k; output_buffers 4 32k; postpone_output 1460; proxy_buffer_size 32k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; fastcgi_connect_timeout 120; fastcgi_send_timeout 120; fastcgi_read_timeout 180; fastcgi_buffer_size 128k; fastcgi_buffers 4 256k; fastcgi_busy_buffers_size 256k; fastcgi_temp_file_write_size 256k; fastcgi_intercept_errors on; fastcgi_ignore_client_abort off; Where am i going wrong with the config, I have tried various settings but the issue still persists. These are the errors i keep getting 2011/11/13 18:20:33 [error] 21583#0: *311683 upstream timed out (110: Connection timed out) while reading response header from upstream, client: IP, server: tastykhana.in, request: "GET url HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm.socket:", host: "tastykhana.in", referrer: "url"

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• Why is Denic not accepting my nameservers?

  - by Oliver Salzburg

  I'm currently in the process of moving all of our domains to our own nameservers. Which wasn't an issue until I hit our own .de domain. I (think I) understand the implications of having the NS inside it's own domain, hence the need for glue records. Until yesterday, I would have assumed I have a pretty good understanding of Bind and DNS zones until I was presented with this error from the Denic nameserver predelegation check: Inconsistent set of nameserver IP addresses (NS, provided glues, determined glues) ns2.hartwig-at.de [88.198.242.190/88.198.242.190] Default resolver determined: [], other resolvers determined: {88.198.242.190/88.198.242.190=[/2a01:4f8:d13:3c85:0:0:0:2, /88.198.242.190]} Inconsistent set of nameserver IP addresses (NS, provided glues, determined glues) ns1.hartwig-at.de [cloud.hartwig-at.de/176.221.46.23] Default resolver determined: [], other resolvers determined: {cloud.hartwig-at.de/176.221.46.23=[/2a00:1158:3:0:0:0:0:b6, /176.221.46.23]} Screenshot of the result The support of my registrar is either far better educated than me or doesn't have a clue. Either way, they're avoiding my questions in regards to what this error means. They just tell me Your nameserver has to return your own nameservers as the default resolver. But that doesn't make any sense to me and they refuse to try to explain it any other way. This is the head of my current zone file: @ 86400 IN SOA ns1.hartwig-at.de. hostmaster.hartwig-at.de. ( 2012070505 ; serial 1d ; refresh 3h ; retry 4w ; expiry 1h ) ; minimum 3600 IN NS ns1.hartwig-at.de. 3600 IN NS ns2.hartwig-at.de. 3600 IN MX 10 remote.hartwig-at.de. 3600 IN MX 20 mx1.hartwig-at.de. 3600 IN MX 30 mx2.hartwig-at.de. localhost 3600 IN A 127.0.0.1 localhost 3600 IN AAAA ::1 @ 3600 IN A 176.221.46.23 3600 IN AAAA 2a00:1158:3::b6 * 3600 IN A 176.221.46.23 3600 IN AAAA 2a00:1158:3::b6 hetzner 3600 IN A 88.198.242.190 hetzner 3600 IN AAAA 2a01:4f8:d13:3c85::2 cloud 3600 IN A 176.221.46.23 cloud 3600 IN AAAA 2a00:1158:3::b6 ; List all NS as A/AAAA record ns 3600 IN A 176.221.46.23 ns 3600 IN AAAA 2a00:1158:3::b6 ns1 3600 IN A 176.221.46.23 ns1 3600 IN AAAA 2a00:1158:3::b6 ns2 3600 IN A 88.198.242.190 ns2 3600 IN AAAA 2a01:4f8:d13:3c85::2 So, what is the problem with my zone? And what is the "default resolver"?

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• How to scan local network (LAN) for connected devices (MacOS)

  - by smotchkkiss

  I'm basically looking for something like this but available on Mac. I am trying to connect a new workstation to our wireless multifunction printer and I'm having a hell of a time getting the device to spit out an IP for me to connect to. Is there a way I can scan the network somehow? If it makes a difference, the new workstation is using MacOS X 10.6 Thanks in advance :)

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• Accessing webserver behind cheap router

  - by malfist

  I have a trendNET wireless/wired router, and inside the LAN I have a webserver on 192.168.10.103:80. Does anyone know how I can access the webserver from outside the LAN? I setup a "VirtualSever" to portforward publicIP:8080 to 192.168.10.103:80, but it never loads. Port scanning the external IP shows the port as "filtered" on the router, and from the inside, it shows 192.168.10.103:80 as open. Does anyone know how I can make this work?

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• Routers with decent parental monitoring / traffic logging?

  - by antiver

  I'm looking for consumer router / firmware recommendations with reasonably robust remote URL / hostname logging & reporting functionality. Most logging functionality I've seen is terrible - reporting only IP addresses, not rolling up reports or reporting any useful statistics. The logs are also often limited to merely the last few minutes/hours when handling high-traffic loads. Bonus points for providing a screenshot of the log reporting interface!

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• Save a shortcut to a samba share in KDE

  - by jwaddell

  Using Dolphin in KDE I have opened a particular (password protected) samba share, by typing in the IP address and navigating to the right folder. However I can't find any way to save this location for future use (other than saving the URL to a text file and copy-pasting it into Dolphin). I would be happy with some kind of bookmark in Dolphin or a desktop shortcut, etc.

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• Win 2k3 - DNS query ?

  - by nXqd

  I'm learning about network and I configured DNS in 2k3. In forward zone : cntt.edu www.cntt.edu [ 192.168.188.4 ] . [ All IP / DNS configuration is right ] After that I use wireshark to catch packet when I enter www.cntt.edu in IE . I see there's no DNS here, I forward directly to 192.168.188.4, there's no query . Any problem ? Thanks for reading this :)

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• wireless router on LAN

  - by Scott

  Hi, Can I put a wireless router (for a laptop to talk to) which is configured to use DHCP on our work LAN ? I just need the laptop to be able to talk to the internet. Will it automatically get the gateway information when it is assigned an IP via DHCP ? Thanks Scott

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• I am getting brute forced, what do I do

  - by Saif Bechan

  I am getting brute forced to my email server, IMAP and POP3. I have the full package of ASL installed but it just sends me the OSSEC logs. How can I ban the IP. I thought ASL automatically blocked these attacks after a few wrong tries. How can I do that.

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• What other protocols must not be fire-walled for FTP to work?

  - by Chris

  my Netgear router randomly reset itself the other day loosing all of my config settings: DSL details, Firewall rules, the lot! So I set about restoring all of the details manually, but when it came to configuring the firewall I wanted improve the security by explicitly setting 'deny' rules for everything that I figured is 'non-essential', and (although not necessary) whilst I was at it I set explicit 'allow' for the 'essential' protocols. I'll admit now I didn't really know what I was doing and everything was just 'my best guess', but I enabled only DNS, HTTP, HTTPS, FTP, SFTP, TFTP with everything else blocked. This did not work for me as I could not access 99% of web sites (although strangely Google worked!), so I played around a bit more and found that (oddly) if I disabled just the explicit 'allow' rules then everything worked fine, for browsing anyway. Today I came to work on some web-sites via FTP and just could not get a consistent connection, it kept dropping out after a few files or being blocked by the server or simply not connecting. It would authenticate okay but then stop when retrieving the initial directory listing! e.g.: Status: Delaying connection for 1 second due to previously failed connection attempt... Status: Resolving address of ftp.domain.co.uk Status: Resolving address of ftp.domain.co.uk Status: Connecting to 123.123.123.123:21... Status: Connecting to 123.123.123.123:21... Status: Connection established, waiting for welcome message... Status: Connection established, waiting for welcome message... Response: 421 Too many connections (8) from this IP Error: Could not connect to server Status: Delaying connection for 5 seconds due to previously failed connection attempt... Response: 421 Too many connections (8) from this IP Error: Could not connect to server Status: Delaying connection for 5 seconds due to previously failed connection attempt... I've checked and re-checked the FTP settings (they worked before anyway), I have Googled the I.T. out of the various protocols that I have blocked in the fire-wall but none seem essential to FTP (other than FTP/SFTP etc. which I have passively enabled). I'm (clearly) no server engineer, or protocols / fire-wall expert so I was hoping that some one could maybe shed some light on why my FTP is failing. I've been wondering if I ought to be allowing BGP, BOOTP and/or IDENT (or any others)? What other protocols are required for FTP? Thanks in advance!

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• Socks proxy on mac's shared internet

  - by AliBZ

  Hi all I use my mac's internet sharing to create wireless network for my ipod touch. I have a linux server and I use socks proxy. I wanna use this proxy on my ipod but i don't know how. I put my shared network connection behind the proxy with localhost ip but my ipod isn't behind the proxy. any ideas?

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• Putty Help with @ Key

  - by jb0510

  I am new to putty. I am pushing files to a customer with sftp command that includes @ sign in the command. e.g. sftp (login@IP Address) the session will not allow @ on the command line. It bounces me to the next line. Can anyone tell me how to correct this.

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• Configuration Deployment to Linux Systems

  - by William

  Hello, I'm looking for a nice way to add / remote ips (and possibly interact with an asset inventory system to track where ips are), start / stop processes, download logs, and all around genearal system admin duties from one place. It's okay if I require more than 1 program. That would still be better than having 50 million terminals open and trying to trace ip assignments etc on whiteboards. I'd also like to know if anyone knows any good asset management programs. Best Regards, William

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• How to implement custom domain feature like posterous?

  - by Weiwei

  here is how posterous works, I make a A record of DNS of my domain (blog.mydomainname.com) to posterous IP address 67.207.139.81 , in the manage panel of posterous , i put my custom domain (blog.meetingly.com). Then i can reach my posterous blog http://mydomainname.posterous.com from http://blog.mydomainname.com url. How posterous implements this? Is this a DNS level thing or web server level setting? Thanks a lot!

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• DNS CNAME - SSL-certificate issue.

  - by Phoibe

  Hey, I have obtained an SSL certificate by Thawte for domain.com Now my infrastructure changed due to heavy load I have mx.domain.com as SMTP relay storage.domain.com as Mail-Storage and domain.com pointing at Web-Server Every server is hosted on another dedicated/virtual server with individual IP. I do not want to put the Web-Server on the Mail-Storage for security reasons but I do want to use my SSL-Certificate for the Mail-Storage(POP3S/IMAPS). Is that possible or how do I solve that issue?

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• Does mailx send mail using an SMTP relay or does it directly connect to the target SMTP server?

  - by iamrohitbanga

  Suppose i send a mail using the following the following command: mailx [email protected] then does mailx first try to find out the SMTP server of my ISP for relaying the mail or does it connect directly. Does it depend on whether my PC has a public IP address or it is behind a NAT. How do I check the settings of mailx on my PC? How can I verify this using tcpdump?

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• Web site DNS configuration Without using hosting nameservers

  - by user39110

  Hi, i am publishing my website(www.muratturan.com) by using godaddy's "Total DNS Control". My configuration like this: 1-) I configured my domain to total dns control by setting nameservers to total dns control's. 2-) In total dns control panel i set A host to directly my VPS's ip address. 3-) Also i configured mx records to google apps. Everythings looks good but i am thinking that is this technuqie has any negative effects ? Thanks

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• What is the best way to configure windows firewall to open up sql server to lan computers

  - by Breadtruck

  Should I configure a specific port for SQl Server and open that port up to the lan ip address range or open up the firewall based on the program, and wouldn't this require making a rule for each instance? Do I need to add sql browser as a rule if I want lan computers to see the sql server instance?

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• Proxy Access to my Squid Proxy

  - by Fake4d

  I have a squid proxy cluster to let my users surf in the internet and on intranet ressources. Now there is a special user, that wants to configure another squid in the net of the users. So this proxy wants to access the internet over a proxy-proxy configuration. It doesnt work at the moment. So here is the question: Whats the configuration line for my squid.conf to allow an IP to use my squid as an upstream proxy?

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• Multi-site email relay based on email address (in AD?)

  - by MarkRobinson

  We have a multi site setup currently based around Exchange 2003, but we are getting a lot of traffic over the vpn as only one server has an internet facing IP. Is there such a product that could sit on a hosted rack somewhere that would look at an incoming email and from information in AD determine which mail server to relay the message to?

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• How do I prevent mail from my Exchange server from being blocked?

  - by Mike C

  Recently one of our client machines was infected with a virus and I believe was spamming addresses in the user's contact list. Since then our server has been appearing on blacklists and it has been causing our e-mail to be blocked and returned by many clients. The virus has since been cleared, what can I do to get our server off these blacklists so that we will have more reliable e-mail service? Will I have to change my IP address? Thanks, Mike

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• "No route to host" with ssl but not with telnet

  - by Clemens Bergmann

  I have a strange problem with connecting to a https site from one of my servers. When I type: telnet puppet 8140 I am presented with a standard telnet console and can talk to the Server as always: Connected to athena.hidden.tld. Escape character is '^]'. GET / HTTP/1.1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Reason: You're speaking plain HTTP to an SSL-enabled server port.<br /> Instead use the HTTPS scheme to access this URL, please.<br /> <blockquote>Hint: <a href="https://athena.hidden.tld:8140/"><b>https://athena.hidden.tld:8140/</b></a></blockquote></p> <hr> <address>Apache/2.2.16 (Debian) Server at athena.hidden.tld Port 8140</address> </body></html> Connection closed by foreign host. But when I try to connect to the same host and port with ssl: openssl s_client -connect puppet:8140 It is not working connect: No route to host connect:errno=113 I am confused. At first it sounded like a firewall problem but this could not be, could it? Because this would also prevent the telnet connection. As Firewall I am using ferm on both servers. The systems are debian squeeze vm-boxes. [edit 1] Even when I try to connect directly with the IP address: openssl s_client -connect 198.51.100.1:8140 #address exchanged connect: No route to host connect:errno=113 Bringing down the firewalls on both hosts with service ferm stop is also not helping. But when I do openssl s_client -connect localhost:8140 on the server machine it is connecting fine. [edit 2] if I connect to the IP with telnet it also is not working. telnet 198.51.100.1 8140 Trying 198.51.100.1... telnet: Unable to connect to remote host: No route to host The confusion might come from IPv6. I have IPv6 on all my hosts. It seems that telnet uses IPv6 by default and this works. For example: telnet -6 puppet 8140 works but telnet -4 puppet 8140 does not work. So there seems to be a problem with the IPv4 route. openssl seems to only (or by default) use IPv4 and therefore fails but telnet uses IPv6 and succeeds.

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• How to copy a 200GB file faster?

  - by RainDoctor

  I got a 200GB .tgz file on server A(RHEL 5.2). I wanna transfer that file to server B (RHEL 5.3). Server B is on ESXi 4 Update1. I gave 10GB to that Server B VM, with 4 vCPUs. Both Server A and Server B are connected with an ethernet cable with local IP addies (no switch involved) scp gives me about 3Mbps. Is there a way to get 400Mbps?

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