Ubuntu Networking :: 2 NICs, Server Won't Respond To Requests But Internet Works

Apr 16, 2010

I recently set up a new web/file server with 9.10 server x64 with 2 NICs and I am trying to configure eth0 to respond to my LAN for internal samba filesharing and eth1 to handle website/ftp requests on my static IP, but whenever eth0 is up the server is not accessible at 173.XX.165.65 for web or ftp but both work fine at 10.1.10.100. When eth0 is down, public IP works fine. I have set /etc/network/interfaces like this:

Code:
# The primary network interface
auto eth0
iface eth0 inet static
address 10.1.10.100

[Code].....

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Ubuntu Networking :: Server With Both NICs Enabled Breaks Internet Connection?

Nov 25, 2010

I have installed Ubuntu 64 10.04 server. I have two nics and have set them up to both be static with their own IP with the correct gateway, network, broadcast, subnet and dns-nameserver. When I have both enabled, I can ping local pc's but I can't ping Internet sites like Google nor can I get out to the Internet with apt-get or Lynx.

If I disable one, then I am able to get out to the Internet. All my configs look good, and it does not matter which one I disable, just so long as there is only one NIC on, everything is good.

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Ubuntu :: Can't Get Apache To Respond To Outside Requests

Sep 6, 2010

I've been scouring the message boards and trying different things for two days and haven't found a solution. I set up Ubuntu 10.04.1 a few days ago using the server iso and selected the LAMP installation option. I will be using it as a sandbox to try out things from a PHP/MySQL book I purchased.

I have installed Gnome since sometimes I just can't get the command prompt to let me do things and Gnome may at least tell me why. I also installed PHPMyadmin.

My problem is that I can work with this thing all I want in any way I want - HTTP, SSH, SFTP, etc. - from within my home network but Apache refuses to respond to an outside request. Since it's only a test box it usually wouldn't be that big of a deal but I am going out of town for a couple of days and would really like to start working with my new book.

I am 99% sure my ISP is not blocking any ports. I have a ComTrend ADSL modem with router. I have given my Apache server a static IP on the NAT (xxx.xxx.x.101) and set up a dyndns address so I don't have to keep remembering the IP address.

Here is what I have tried so far: Setup a virtual server (port forwarding) on the router to to direct traffic on port 80 to internal IP .101The router told me its interface is using 80 so it would move itself to 8080 Made sure to also add port trigger for port 80 Made sure to save/reset the router Used my iPhone to connect via 3G - didn't work using IP or dyndns name Used iPhone to connect to 8080 and router responded

Set port forwarding/triggering for 8080 -> 80. No joy there, either Tried changing listening port to 8000Set port forwarding and triggering to allow port 8000 Changed ports.conf to read NameVirtualHost *:8000 and Listen 8000 Changed first line of /etc/apache2/sites-enabled/000-default to <VirtualHost *:8000> Restarted Apache service

Apache responded to dyndns.com:8000 from home machine No response when trying same on iPhone (sorry, it's the easiest way for me to test from outside my home network)

At one point, I added "ServerName localhost" to the otherwise empty httpd.conf file but that didn't seem to do a darn thing.

Many of the posts I have perused are at least a couple of years old and have included information on taking action with files that are not there or are no longer where they were. I have interpolated where I can but so far nothing has worked.

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CentOS 5 Networking :: 2 NICs Only One Works - Eth0 Don't Work

Jan 18, 2010

I have a Proliant DL 120 G5 with CentOS 5.4 and I have installed a Brodcom Corporation Netxtrem BCM 5722 Gigabit Ethernet PCI. So I have two interfaces: eth0 broadcom eth1 Intel The eth1 works, instead eth0 don't work. I can ping itself and 127.0.0.1 but I can't ping the gateway. The results of netstat -nr is:

[code]....

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Networking :: Configure 2 NICs To Share Internet

Mar 22, 2010

I am really bothered from this I cant configure the 2 nics to share the internet and I already changed the sysctl.conf file to
# Controls IP packet forwarding
net.ipv4.ip_forward = 1
I have one nic reeving the internet and working good and the other one cant see anything...

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Networking :: Confused With Two NICs, No Internet When Both Are Enabled?

Jul 14, 2011

I have been looking for a solution for this but am not certain how to word it to get a viable answer.My scenario:

Athena
Win7/Ubuntu 11.04
eth0 10.11.12.100/16 gateway+dns: 10.11.12.1

[code]....

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Networking :: Balance The Internet Requests From LAN Using 2 Connections?

Feb 17, 2010

I have a firewall ( a pc with debian 5) with 2 internet connections. each connected to a ethernet card (the firewall has 2 ethernet pci cards so it has one connection per card)how can i balance the internet requests from my LAN using this 2 connections?

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Fedora Networking :: Dual NICs And Internet Connectivity On F10

Apr 23, 2009

I've just installed Fedora 10 to basically work as a NAS for another machine - but also serve a couple of web pages. After having alot of issues with network manager (with it changing the subnet so nothing would work), I'm now almost there:

I have two network cards connected in the server:
1) eth0 connects to a switch that ultimately connects it to the net (on a 10.0.0.* network)
2) eth1 connects directly into another server for backups (192.168.0.* network).

Now when I setup eth0, I get network access can ping/ update/ surf the net - absolutely no problems, but when I connect eth1 in - the net dies and nothing works, I can ping devices on both the 10.0.* and 192.168.* networks, just nothing past the gateway. I presume this is either a route or DNS issue, but am unsure about where its falling foul - both the resolv.conf file looks fine as do the ifcfg-ethx scripts.

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Networking :: Setup 2 NICs With Access To Internet With 1 Gateway

Sep 13, 2009

I have 1 root-server with 2 NICs, both having their own internet IP addresses:

Code: eth0 = 8x.x.x.183
eth2 = 8x.x.x.205 We only have one gateway on that network:
Code: gateway = 8x.x.x.1 We want to use eth2 for postfix + http, and eth0 for all the other stuff.

How can this be setup ? With route / ip route / iptables ?

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Networking :: Share An Internet Connection From A Computer With Two NICs ?

Feb 24, 2010

Im posting after reading through a lot of articles explaining the same thing on how to share an internet connection from a computer with two NICs.

I have the following simple setup

When I first followed this guide

I was able to ping between the GW and a client on the LAN but couldn't access the internet from it. So I started to configure different things to get it to work which failed.

Now I can't ping between GW and the LAN. I tried to follow the same guide over again and even flushing the tables but still...

These are my current settings (without any chains).

(this client also has a wireless connection displayed in 'ifconfig')

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Ubuntu Networking :: SSH Connection - Router Works To Except Connection Requests

Jul 28, 2010

I'm trying to do a SSH connection between my home and work PC both machines are running ubuntu 10.04. I have read all the comunity documentation at [URL] from Work PC. I went on to the web site what is my ip address and noted down the number, From Home i opened a terminal and typed: pnig (ip address). to which their was no reply, now i'm assuming i need to configure the works router to except connection requests, is this Correct?

Also what information do i need from my works network and how do i get it? I understand that I need the routers expernal ip address, but how do i referiance a specified computer after that address? What program do i use in ubunu and how is that information applied to it?

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CentOS 5 Networking :: Routing 2 Internal Nets Through Separate NICs To Internet?

Nov 9, 2009

I have configured CentOS 5.4 as a router/firewall (iptables) as such, and it is working fine:

eth0 - Public IP/Intenet, DHCP
eth1 - 192.168.0.0 internal "net1"
eth2 -10.0.0.0 internal "net2"

I want to add a fourth NIC, eth3, which will be assigned its own Public IP/Internet address (thru DHCP; my ISP provides two). The purpose it to route all net1's internet-bound traffic through eth0, and all of net2's internet traffic to eth3. This allows me to use one router/firewall machine instead of two separate ones. I anticipate that without some specific routing instructions, the default route will be eth0 for all net1 and net2 internet traffic (eth3 will be ignored).

I thought of using just one NIC (eth0) but create an alias (eth0:0), but IPtables (and possible DHCP) can't differentiate between the two (besides, nics are inexpensive). Is there a way to do this through routing commands, or even use iptables prerouting/forward functions (or is using iptables problematic)?

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Networking :: Bonded NICs At Host OS - Ubuntu Server - Bridged To Virtual OS - UServ - In VMware Server

Jul 19, 2009

Just something that struck me while working on our virtual servers today.

I have bonded 3 NICs at the host in Ubuntu Server 8.04 LTS. They are using mode 0 for Round-robin. Point is to increase the speed/performance of all the servers, but mainly the fileserver. The fileserver is a virtual server running Ubuntu Server 8.04 LTS on VMware Server 2.0.

1) I noticed the NIC in the slave OS reported link speed as 1000 and Im unable to change it as the NIC (virtual one) doesnt support it. Does this not really matter, as the NIC doesnt exist, and it will run at higher speeds anyway? Or do I have to remove the bond on the host, bridge all 3 interfaces from the host to the slave OS, and then make a bond in the slave OS?

2) While at it, does mode 0 only increase performance on data being sent from the host or does it also increase the available incoming bandwidth?

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Ubuntu Networking :: Pxe Booting - Server Does Not Respond To Arp

Jan 21, 2010

I am trying to get a server to boot off the lan (pxe). I added a tftp server and tested it as operating successfully. I just plugged the pxe-server in and see the dhcp request/response as expected. The pxe-server then sends out an arp to the same address as the dhcp exchange, but the server never responds.

1. as the pxe-server already has info on the mac/ip-addr, why is it now sending another arp

2. why doesn't the server respond? I have most of my network setup the same way and the dhcp exchange is fine.

3. I'm guessing that the arp is triggered by the bootp exchange (next-server).

I do not have the server in the host table under that address.

127.0.0.1 localhost
127.0.1.1 ubuntu-desktop
192.168.5.101 windows1

Do I need to add 192.168.5.120 with a name to get arp to respond?

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Ubuntu Networking :: NICs On Clean Server Installation Not Working?

Aug 18, 2010

I have a clean installation of Ubuntu Server 10.04 x64 on an HP Proliant DL380 G3. It has two Broadcom NICs in addition to its ILO. During the installation, both NICs were listed... but neither was able to pull DHCP, nor did they function with manual settings. The first NIC is currently connected and is known good. So I left it alone and figured I'd troubleshoot it later (which is now). This server is going to be a VMware Server host. I wanted to install ESXi on it, but it doesn't like the old server's cheap ICH RAID controller.

[Code]...

I noticed here it says they're disabled. so I thought perhaps this was a 64-bit driver issue. So, I booted my trusty Ubuntu desktop 10.04 32-bit live cd, and the NIC works fine. Now, here's where it gets weird. Seeing that, I booted it to Ubuntu server 10.04 32-bit installation from a flash drive, expecting to see the NICs working fine during the installation.

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Fedora Networking :: Routing: 2 HW-Routers, 2 Nics On 1 Server?

Mar 19, 2011

i have a Server, which has 2 nics installed. Each of those is connected to a router, which is connected to internet. On the server, i have apache, maillserver and im-server running. On the other hand, also squid, dansguardian and clam are running. so now: via eth0 i would like to have just the traffic, which is requested from outside (the big bad internet..) to my server (apache, mail, etc). via eth1 i would like to have all OUTGOING (also to the big bad internet) from the server, which is requested by a internal client. And of course all requests to my own server

both nics shall route their traffic to their own router. For better comprehension please consult the enclosed graph. Until now, i did not find a good solution, the default route is set to the traffic from eth0, if not, no external request will find back to a client do you have a idea how to handle this the easiest way?

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CentOS 5 Networking :: Configuring DHCP Server With Two NICs?

Mar 31, 2011

configuring DHCP server with two NICs. I need DHCP server with 2 NICs:

eth1 - 192.168.103.11
eth2 - 192.168.123.11

The client also has two NICs and suppose to receive ip addresses eth1 from 192.168.103.0 and eth2 from 192.168.123.0 Here is the dhcpd.conf from dhcp server:

ddns-update-style interim;
authoritative;
ignore client-updates;

[code]....

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Networking :: Configuring 2 Nics To Talk To Two Different Subnets On A Sles10sp3 Server?

Nov 27, 2009

I am trying to setup a HP blade (BL460) server with 2 nics on sles10sp3. I want one nic to connect to a management vlan and and second to connect to the standard network. It should be possible for a desktop in the standard network to connect to either nic by providing the correct ip address.use this server as our first virtualisation hosts server using Xen. I dont want traffic used to upload / download images to the server through nic1 to effect the users traffic on the standard network on nic2. However any attempt at routing (which Im not good at) has led to the tx traffic all going out the default route (users subnet).

Each time I setup the nics via yast2 lan I can get the standard lan nic working ok. but cannot get the management nic working correctly. The server can ping a workstation on another vlan, but the workstation cannot ping the management nic. The default route appears to be forcing all traffic on the host out through this route, which I presume is normal behaviour. Using tcpdump I can see the ping packets received by the server, the server then responds through the default gateway, which the workstation does not see.

However, this normal behaviour will result in extra traffic on the users network when image downloads are initiated from the management interface.If I use a 172.24.1.0 network routed through 172.24.1.1 router setup as our management vlan , and 200.200.1.0 with router 200.200.1.1 as our lan for general users. Where server ips are nic1 10.1.1.10 and nic2 200.200.1.10 My workstation would be 200.200.1.10. If I ping the server at 10.1.1.10
I get no response. If I ping the server at 200.200.1.20 no problem.

Basically I used the network setup recommended by vmware to manage a virtual server. I actually have 4 nics, I thought by just talking about 2 nics the problem would be easier to explain. vmware specify that two nics should be used for management and two for the Lan. This is what I am trying to achieve, but both subnets must operate independently.

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CentOS 5 Networking :: Dnsmasq Dhcp - DNS Server Does Not Respond

Jan 9, 2011

I got a CentOS server setup as a dhcp server using dnsmasq. I followed this guide more or less: [URL] So, the problem seems to be concerning the DNS server on the clients. In windows I get the "limited connectivity" icon for the network, and when I select troubleshoot it says the DNS server does not respond. Issuing 'ipconfig /all' clearly shows the IP of the CentOS machine as the DNS server, which should be correct, yes?

ETH0 is working as WAN connection and that works great.. no problem with the WAN connection at all on the CentOS machine. ETH1 has the IP 192.168.0.1 and mask 255.255.255.0 When starting eth1, it sometimes says that it can't start eth1 because the IP 192.168.0.1 is already in use.. but that is most certainly not the case. Maybe there's some kind of issue here that messes with the DNS? What's mind boggling is that it works great on a linux machine (dhcp client) and on a windows xp machine. but it does not work on the windows 7 laptop and a vista laptop and a pda device.

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CentOS 5 Networking :: Server Does Sometimes Not Respond To External Contact?

Mar 1, 2011

I have a CentOS 5 Server running for private fun... Just for playing with it and learn a little linux.this server has to Network interface cards. one for connecting from extern and one from connecting from the LAN.when i want to connect from lan (eg via SSH) this allways works!when i want to connect not from LAN this only works sometimes! only if i establish at the same time a connection from LAN it wors mostly.with other devices i have no problem (tested another server with just 1 NIC) and this works too.also the problem is not dyndns because i have the same problem when i try to connect through the direct IP.

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Ubuntu Networking :: Samba Server Stops Accepting Mount Requests?

Apr 21, 2011

I'm having an issue with a Samba server running on an Ubuntu "server". Technically, it's not a server, it's just an old desktop with Ubuntu 10.04 running it..and I have a few server processes running (ProFTP, Samba, etc.)The Ubuntu server is where I store all of my important files that get backed up to a separate hard drive. I shared folders via Samba, and I use two computers to access the shares. I access the shares with an .sh file I created that uses the mount cifs command to mount to those shares.

It has been working flawlessly for a long long time, up until recently. For the past few days to a week, I will try to mount the shares with no result. In the terminal, the commands just freeze, as if the command is trying to execute, but having network issues.The only way I can get it to work is if I reboot the Ubuntu server, then it maps flawlessly. But a day later, it's back to hanging up when trying to mount.

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Ubuntu Networking :: Wired Networking - Connection Works But No Internet

Jun 1, 2011

I just installed Ubuntu 11.04 desktop on my desktop in dual boot with Windows 7.

Heres my problem, I am unable to connect to the Internet even though my wired Ethernet connection says it is connected normally. The wierd thing about this is that I also have a wireless card in my desktop and when I connect through that I am able to connect to the Internet. I am connecting to a router that is functioning as a repeater to my main router/cable modem. I have tried to solve this myself but am having no luck. Ironically, earlier today suddenly my ethernet connection worked for a few minutes without me modifying anything.

The output of some terminal commands are below.

Quote:

Quote:

Quote:

However a pint to that ip address (my router) is successful.

Quote:

Hosts.allow and hosts.deny are both fine (not blank but no entries)

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Ubuntu Networking :: Wifi Works But No Internet Only On (10.04) Side

Oct 24, 2010

Wifi Works, but No internet When I'm directly connected to the Wifi router, via LAN cable, I have internet (this is how I'm posting now) I have a desktop computer, this is also the same problem. Because of this it hasn't updated to 10.04 yet. Its still at the version previous (9.??). Might be relevant. This problem began when my wife's Mac had an update that killed her Wifi access, and we had to reset the Wifi Router. She didn't change anything, we just re-inputed all the data as before (passwords, ID). Since then I can't access my internet even if I can connect to the wifi.

Other Observations In the office, my Laptop's ubuntu side has no problems with accessing Internet through the wifi. My Windows side is unaffected (both Desktop and Laptop). One time I can connect, but when that happened on that same day she can't. Possibly a fluke or coincidence. I read the post of a similar matter, where the person's Empathy still works. when I tried check if that was the case with me, after getting my Empathy to work it began to work again. But this hasn't worked in a succeeding attempt. Below is my system information if it may be relevant.

[Code].....

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Ubuntu Networking :: Internet Through Modem Works But Not Through Wireless Router?

Jan 22, 2010

I just bought a TRENDNET TDM C4000 (=modem/ wiredrouter) and got it working. If I connect my computer with through the ethernet port directly, the internet will work. However, when I try connecting the ends of the ethernet cable on the modem and my wireless router, it's not transmitting. I know I set up the wireless router correctly because it worked with my previous modem. I just need to know how to configure my modem so that it works with my wireless router (D-Link DI-524).

I have a long wired ethernet wire to satisfy my academic needs for the internet at the moment but my mother is not able to surf the internet and it would be more convenient for myself to put the wire back to my desktop and have my laptop browsing wirelessly.

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Ubuntu Networking :: Updated From 9.04 9.10 And Now Wired Internet No Longer Works?

Jul 17, 2010

I used the "Upgrade" option the last couple of nights to go from 8.04 LTS and was going to go to latest version. Well got the upgrade done last night on 9.10 and now Broadcom gigabit wired connect will not connect to internet. Can ping router just fine. Just cannot get outside of it. Shows as configuredin ifconfig. But the name of it under the network manager is odd. Its ifupdown (eth0) (default) and maps to ent1.

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Ubuntu Networking :: Netbook: Internet Works With Windows Partition?

Jul 31, 2010

I just installed an Ubuntu partition on my MSI U210 netbook. Wireless worked fine on the Windows XP that was there before, but not on Ubuntu. I tried plugging in the Ethernet, and that had no effect.

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Ubuntu Networking :: Internet Connection Lost But Email Still Works?

Nov 24, 2010

I am a non-techie, have been gratefully using Ubuntu 8.10 for a few years for the basics: email, web, documents, photos. I have somehow lost my internet connection, but strangely my email still works...!?!? My router is showing all the correct green lights, but I cannot get to any url. I am posting this thread via work (windows) pc. I have searched on this forum and in anticipation have done as much homework as possible, see below.I have a Netgear wired router. I cannot find Network manager on the menus and tried this from the terminal:

Code:

network-manager
bash: network-manager: command not found
networkmanager

[code]....

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Ubuntu Networking :: Wired Internet Suddenly No Longer Works

Mar 6, 2011

My wired internet was working fine and dandy under Maverick until today. For no apparent reason, it stopped. The router works fine. All other computers are able to connect. I've tried using different cables with no luck. I have a Biostar A785G3 motherboard with an integrated Realtek RTL8111DL ethernet controller.

My problem sounds very similar to this guy's: [url]. But his strange solution didn't seem to work in my case.

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Fedora Security :: 2 Nics Internet Connection Sharing ?

Feb 2, 2010

I have several Proxy severs set up at our business. I always do the same basic config, except for my version of Fedora (I always grab the newest).

I put 2 nics in a machine Load Squid, Dansguardian and Firestarter. I use Firestarter to direct the surfing traffic from my LAN out a cable modem that I have for each store. This lessons the bandwidth on the T1.

Easy enough. My problem is Firestarter has always been a little flaky. But as of F11 the gui wont stay up for more than a few minutes at a time. It still functions, but you have to be quick if your going to use it because it will inevitable crash.

So I suppose it's time to start doing this the correct way and using IP Tables. Does anybody have a resource they can point me to that will help me understand how to do this? It looks like this might be as simple as setting it up with the GUI Firewall tool that comes with F12 but I'm still not exactly sure how.

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Ubuntu :: Forward All Requests Through The SOCKS Proxy Before Sending It To The Internet?

Sep 1, 2011

I am making a content filter for a school. I have a computer with Ubuntu Server and the SOCKS proxy, a DD-WRT router, and a switch. how I could forward all requests through the SOCKS proxy before sending it to the Internet.

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