Networking :: WAN Connections To Servers ?
Mar 1, 2011
OK, so, basically, not so long ago I had a modem + LAN cable kind of internet setup, and my friends and colleagues had no problem connecting to my Apache, ircd, etc.
But a few months ago my ISP changed it's policy, and now I have a single cable, plugged directly into the 'eth0' port, which connects to WAN (static IP) and, through PPPoE, to the net (dynamic IP). (Sorry, my knowledge in networking is close to nonexistent)
So, now there is a problem. My friends CAN still connect to my FTP and httpd on Windows XP, through both the external, dynamic IP, as well as the static WAN IP, but my Slackware (WAN IP is set up with DHCP, PPPoE - through pppoe-setup, with firewall at '0') is refusing access. No sings of connection is shown in the /var/log/access_log.
Also, VoiceChatter server DOES log the connection attempt, but it refuses connection, sending a 'Auth challenge', and then cutting connection. (The 'challenge' bit was never there before the new net setup)
All connections are done through WAN static IP (though test with netwide dynamic IP yield the same results =)
I run Slackware 13.1, didn't touch the firewall settings at all, and, as mentioned, pppoe firewall is set to '0' value.
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Dec 2, 2008
So we have DNS round robin set up for 4 servers. If we ping dns name (basically an alias) server_connect it resolves with different IP address in round robin format. I.E. x.x.x.1 x.x.x.2 for the 4 different server IP addresses. When we do nslookup server_connect it will come back first time as server1_connect server2_connect through server4_connect so the server is able to resolve through ping and nslookup resolving the initial dns name (alias) to the dns name associated in the round robin. Problem is when we try to connect with http or telnet it comes back host unrecognized. I can put one of the 4 round robin servers in /etc/hosts and it connects fine so I'm thinking that either one of three things.
1) ttl
2) It does double connection first to identify itself to the round robin server and then handshake but second time it hits for the handshake the IP and dns name is different than what it expected so it fails.
3) Since we are trying to telnet to dns alias and it is returning different dns name it fails.
2 and 3 seem most promising but now I'm at a stand still.Anyone else come across this issue and if so how did you resolve.
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Feb 7, 2011
have a problem with my network-manager in ubuntu 10.10.when I dial one of my vpn connections, my other vpn connections be disabled and I can't use them!I tried to restart network-manager and gnome-panel, but it does't seem to solve this problem.
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Jan 28, 2010
I am noticing really odd behaviour after upgrading from 8.10 to 9.10 (via 9.04). My server frequently becomes unreachable. I am using it as an application server, running Apache, JBoss and MySql. Once the server goes idle, all web connections time out. SSH also times out. Usually the server wakes up on second SSH attempt and then everything: Web, SSH etc seems to run fine.
This is a server machine with no GUI. Can anyone point me to power management or other such settings I can tune from commandline? I have disabled power management by adding kernel parameter acpi=off. I still have the problem. The first network connection after the machine has gone idle takes a long time. All later connections run pretty smoothly.
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Mar 11, 2010
I have a small business that I run Squid and Dansguardian on Ubuntu for network proxy filtering, among other things. This works great, but does not block SSL connections on Port 443, such as https proxies. I understand that this is because this type of configuration is a "transparent proxy".
Is there a way to set one up "non-transparent" and, would that filter https?
I cannot blanket block 443, because some sites need it.
I have read that one can re-compile Squid to work with SSL, but not being a super guru, not sure of the implications of doing that.
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Mar 22, 2009
When setting up my server I noticed that I could control the amount of connections; the maximum seems to be 256. My server is currently windows 2003 server which is unlimited connections - before I change the server to F10 I need to be able to have unlimited connections (I often go over 256 connections, I have 25 web sites hosted). How do I do this on F10 or is there a better distro for web servers that have thousands of Internet connections at the one time?
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Aug 1, 2009
I tried to set up vnc following the steps of this webpage:
[URL]
which did not work. I changed everything back the way it was, but when I tried to ssh in to my remote server, the connection timed out? It showed nothing in secure logs. I tried to ssh in through webmin, in asked for auth but did not connect. The logs said this:
Jul 30 12:05:10 server sshd[2829]: Did not receive identification string from 209.139.209.100
I tried to telnet port 22 through the shell in webmin and got this:
> telnet 209.139.209.100 22
Trying 209.139.209.100...
Connected to 209.139.209.100.
Escape character is '^]'.
Connection closed by foreign host.
I tried reinstalling ssh, but got the same errors...It worked fine before the howto. I can't imagine how it changed something in ssh...
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Jan 9, 2010
I want to set up my laptop to allow connections to certain users with passwords from anywhere over the internet via SSH but I'm unsure about how I would go about doing this. I only thought it would be the case of setting up the open-ssh server on the laptop then, using my external IP and PuTTY on another PC outside of the network, connect to the external IP through port 22 so I tried this and wait 3 or 4 minutes or so and it says the connection times out.
I have also configured my router to use port forwarding but this doesn't seem to help much either and I have LAMP setup to allow connections to external IP : 80. The only thing I am able to do is access the laptop through the local network by using its internal IP's like 127.198.0.1:22 or something. I was wondering if anybody knows if and could tell me how I would do this as I really want to be able to access my home computer/laptop from my work sometimes, especially if I have work at home which is not with me at work or something.
I know this is possible but I'm quite new to this type of thing and don't know what is going wrong. Have I missed something or do I need to change any .conf files or anything?
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Feb 24, 2010
My setup:
Ubuntu Karmic Server Edition 64 bit
Dell PowerEdge T610
4 internal NIC RJ45
1 add-on NIC Fibre 1 Gb
Samba 3.4.0
two shares intended for WIN clients
Connections: eth0 (the first internal NIC) is part of a private network of 4 servers connected to a Gb switch. this connections serves as a fast link among these servers to regularly transfer (backup) large quantities of data. Only I can utilise it from within the server room (among those servers, obviously).
eth0: 192.168.0.AA1 eth4 is the Intel add-on NIC with 1 GB fibre connections to the public network of our institution. This is the link/IP my WIN clints have to use to access their shares. eth4: 134.XXX.YYY.ZZ1
My Problem: Despite having including both interfaces in my smb.conf only the internal connection via eth0 lives up to my expectation and delivers up to 50 MB/s. All clients trying to connect via eth4 will be able to see and access the shares, but file transfers commence with speeds severely below 0,5 MB/s with lots of aborts and warnings from the WIN file explorer.
So I experimented with the setting "interfaces" in the global section of smb.conf --- to no avail. I even set samba only to eth4: same problem. Only way to get flawless & fast transfers is the way through eth0. The samba log files of the clients I tried do show some errors, but I fear I am unable to interpret them properly.
/etc/network/interfaces
Code:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface Intel Gb link via fibre
auto eth4
[Code]...
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May 25, 2010
I'm curious how I can use a Windows client with two separate accounts to connect, at the same time, to a SMB server hosting two shares. (Provided permissions and accounts are all in order)
Scenario:User1 is always logged onto a Windows client mapped to a Public share on a Linux SMB server.I need a way to keep User1 connected to the Public share and then when needed, allow User1 to provide User2's credentials to connect to a Restricted share.The only way I've been able to do this is to disconnect from the Public Share then reconnect to the Restricted share using User2's credentials. (This is the issue because I need to keep User1 connected to the Public share).Is this a limitation of SMB? Or am I missing a configuration? Please point me in the right direction
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Jul 23, 2010
i would like to know how many connections per sec/min/hour, xampp can handle. I'm going to run SMF forum on my box, because i'm not ready yet with real server solution. System stats are: G31M-S2C; 2x2GB Kingston@920Mhz; E5200@3500Mhz; 500GB@7200 Seagate, all powered by Lucid x64. In a time i will migrate to a quad, mobo with raid support, etc. but at that point i'm want to know how much connections can xampp handle. Because of the forum nature, i think of auto deleting topics witn no new replys in 5 days for saving place (there will be minimum 1 and maybe max 5 photos per thread, maximum size 2Mb for each).
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Sep 11, 2010
When ever I try to sftp or even ssh into my server I get connection refused.
I have the port forwarded in my router.
What am I missing?
Also I have installed Ngnix so what do I need to do for it to work?
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May 11, 2010
Howcome mysql by default is only allowing connections from localhost? I want to access it remotely from another account (not root).
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May 21, 2010
I have a question about connections with an ubuntu server. Is there a way to know if the terminal computer (which is connected to my linux server) is using WinSCP to connect (on a Windows platform) or a linux system? It seems they are using the same port (22) and I think the exact same protocol (SSH / SFTP), is there a way to differentiate between the two though? And going farther there, is it possible to limit the connections only to linux terminal computers and reject requests coming from Windows computers?
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May 24, 2010
I have slapd-server running but it seems to refuse connections in a very odd way. Wireshark shows that everytime JavaEE-client tries to connect, only 2 packages are sent. As I understand, in tcp/ip protocol, the first is just "hello, who's there". The last is just a message consisting of ACK and RST. I think RST means "we're done". At this point I don't think any credentials are checked so I don't know what could be wrong
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Apr 12, 2011
I know Ubuntu can do amazing things, but I was wondering if it can use different Internet connections for different websites.
The Setup: We have 1x unshaped ADSL connection at 4MBPS (fastest available) that's used for office related things, Skype, General browsing etc. We have another ADSL connection, this time shaped and running at 4MBPS, I want to send all requests to facebook, twitter and downloading sites like fileserve, filesonic, hotfile etc. to the shaped connection. Can iptables be used to do this? The unshaped ADSL router is connected to eth0 and has an IP of 192.168.0.1 the shaped ADSL router is connected to eth2 and has an IP of 10.0.2.1 Local lan is connected to eth1 and has a range of 192.168.1.0/24 Can iptables send a certain webpage (*.facebook.*) to eth2 and other pages (*.google.*) to eth0 ?
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Jul 17, 2011
I have a ubuntu 10.04 dedicated server that I am having problems with. It intermittently cannot connect to any other servers outside its network.
Code:
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
8 packets transmitted, 0 received, 100% packet loss, time 7008ms
(I have tried a bunch of other ips too and none outside its network are pingable) I'm not sure if this is a problem with my server or a problem with the networking outside the server. I have been emailing my server provider and they keep on insisting the problem is with the server and that their network is working fine. Apparently all of their other servers work and they can login into the gateway and ping 8.8.8.8 from there. So they just want to reinstall the OS, but I thought I'd post here to see if anyone has any ideas.
Here is some info I have gained while troubleshooting: I haven't changed any settings at all on the server for months. I haven't done any updates for about a week. The strangest thing is that this is intermittent, there have been a few times in the last 24 hours where I have been able to ping 8.8.8.8 or other ips, but 98% of the time I can't. I have also tried rebooting the server, which had no effect. I can ping the gateway, and I can ping other servers on the same subnet. I can ssh onto the server from my home internet connection, and I can view webpages on apache, so incoming connections work.
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Apr 24, 2011
I'm not sure if this belongs in the Server or Networking section of the forums. Anyway, last month I upgraded my server to Ubuntu 10.04 LTS. Since then, I've had a recurring problem wherein after a certain period of time, the server stops accepting network connections. Ubuntu 10 will continue to reject network connections until someone logs into the server locally, after which time network connectivity is restored and the cycle begins anew. Essentially, the server goes into a "half sleep mode". I say half because the computer is still on and the fans are running.
I've done some searching around various forms and initially figured this issue was related to problems with the Network Manager service (https://bugs.launchpad.net/ubuntu/lu...er/+bug/524454), so I removed the service altogether. However, this problem is still occurring.
I've poured over /var/log/messages and /var/log/syslog, but have noticed no irregular behavior. Has anyone else experienced this issues? I'd rather not resort to downgrading back to Gusty Gibbon if I can help it.
I am happy to provide more information if its needed
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Jan 13, 2010
I have two ubuntu boxes. One is a 9.04 desktop edition and the other is a 9.10 server edition I am working on some code that needs to be highly tolerant of bad network connections. It sends transactions to a central database, but when the network is not available, it caches them locally to retry later.
I have the code working beautifully on my desktop box. but when I test it on this other box (the one running server edition) there is a HUGE DELAY every time it tries and fails to send a transaction to the database when the network is down.
I tested a little further, and I found that if i unplug my network cable and run ping somehost on the desktop, it fails instantly saying "ping: unknown host somehost" But if I unplug the cable on the server box and run the same ping command it lingers for about 40 seconds before the ping fails.
Does anybody have any idea why this might be happening? Is this a 9.04 vs 9.10 difference? Is this a desktop vs server difference? Is there some package I can install, or some config setting I can change that will make the server box insta-fail just like the desktop does?
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Jan 21, 2011
Is it fair to say that connLimit and hashlimit are very similiar on Linux i.e. while hashlimit caters to limits for groups of ports, they both set the connection rate limit per host? How in IPTables, do I configure a policy that limits connections on a port that encapsulates the total sum of all connections from all hosts? i.e. I do not want to allow more than 6000conn/minute for port range that is the sum of all connecting hosts?
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May 30, 2011
I recently installed Fedora 15 now, and during installation I set the internet connection manually, then did update and after reboot, the internet connection settings have been removed. Now I can not set because the network connection to the Internet Connection is inactive. I mention that before the update was functional internet connection.
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Aug 23, 2010
Neither of my wired network connections are listed in the network manager applet. I know that networking seems to be functional since I can ping local devices on the network. I can't resolve DNS names however. I suppose this is because network manager usually handles DNS? I've posted the outputs of various configurations below.
Code:
/etc/NetworkManager/nm-system-settings.cfg
# This file is installed into /etc/NetworkManager, and is loaded by
# NetworkManager by default. To override, specify: '--config file'
# during NM startup. This can be done by appending to DAEMON_OPTS in
[code]....
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Feb 27, 2010
I'm a bit confused about how ssh encrypts connections. I've read a few articles on ssh and they talk about 'keys pairs' (that is public and private keys) on the server and client computers. However, ssh doesn't seem to use these keys for encryption. What are the keys it uses? This question occurred to me when I was trying to make a remote login to an Ubuntu machine. From a remote login perspective, I haven't generated keys on my client machine and haven't enabled key based logins in ssh. (I use the default password based login). If there aren't any keys on my client, then how does encryption work?
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Jan 27, 2011
I just installed Fedora 14 in a hard disk of my PC. I installed MySQL also. I dontt know if this is the correct site for my question, but nobody MySQL related, have an answer yet. For MySQL accepting remote connections, my.cnf file must be edited (bind-address line or skip-networking line in that file). Well, that file in my Fedora-MySQL installation does not have such lines, so i assume, TCP/IP connections are allowed in MySQL. When i try to connect to the MySQL server it refuses the connection with the error 2003, that in short, means no TCP/IP connections are allowed. I disabled the firewall and retried but with no success, enabled the firewall again, and nothing happen. Is Fedora not accepting TCP/IP connections?
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Jan 3, 2011
Is there a way to restrict access for some users to connections from local network through SSH, and have other users that's permitted to log on from connections over the Internet?
E.g. John's laptop only have permissions to access the server on the local network, while Lucy can access the server both on the local network and from the Internet. (Through SSH in both cases)
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Sep 13, 2010
there is a cable connection and a wireless connection. Is it possible that I use the cable and the wireless to run a segmented download on both connections? Like half goes to wireless and the other half goes to the cable? Or if not the segmented download, then at least I surf the Internet with one and download on the other?
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Jun 18, 2009
once I updated , there will be no connections to Internet in GUI , while it's available in TUI . So it's wired , huh ? Before upating, it's available both in TUI and GUI, though all the time the network-manager shows no connection , in fact , there is and both GUI and CUI . Now I updated , and it can't access Internet from GUI.
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Sep 1, 2010
Latest kernel update since Fedora 2.6.33 are mapping all my NFS "shares" twice (two sets of icons, etc.). All work, but why is this happening - was fine previously.
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Jan 12, 2010
When I click on the network manager icon next to the date in the upper right corner of my screen, my network connections do not show up. I have added two DSL connections on my laptop (username & password) but it doesn't show up. Everyday I need to use
Code:
sudo pppoeconf
if I wish to connect to the internet.
Both these connections are added in the same way on my Desktop Computer and it shows up on the network manager. One of them is even the default which connects automatically on startup.
Because it's not working I assume network manager is not compatible with my laptop. Are there patches to install or other programs that can easily manage my internet connection?
I'm using Ubuntu 9.10 on a not-so-new laptop.
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Jul 27, 2010
I have recently installed lucid 10.04, and I am having difficulty accessing my wireless. Following instructions to install the drivers for my wireless card, I always run into a problem when I need to configure my card. When I go to system-administration-network, there is no connections tab listed. I can only access General, DNS and hosts.
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