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My server does not forward packets between interfaces. What am I missing?

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http://askubuntu.com – I'd like to get my Ubuntu 11.04 server to route packet between its two network interfaces. The two ethernet interfaces (eth0, eth1) work apparently well as such. Both have static IP addresses (192.168.2.15 & 192.168.3.15) and both are reachable from their respective network. All IP services as well as the Samba server are reachable from both sides. sysctl -p returns "net.ipv4.ip_forward=1" and I can even ping the interface "on the other side" from both networks. In other words: I can ping 192.168.2.15 from all PCs on the 192.168.3.0 network and 192.168.3.15 from all systems on the 192.1 ()

funckax's picture
Submitted by funckax on 09/13/2012

Stories similar to My server does not forward packets between interfaces. What am I missing?

I'd like to get my Ubuntu 11.04 server to route packet between its two network interfaces.

The two ethernet interfaces (eth0, eth1) work apparently well as such.

I have two network interfaces ppp0 (dail-up and connected to internet all time) and eth0 .I try to ping interface vmnet8(192.168.35.1) using ppp0(223.235.244.193) and get this message

root@VikkyHacks:~# ping -c 1 -I ppp0 192.168.35.1 PING 192.168.35.1 (192.168.35.1) from 223.235.244.193 ppp0: 56(84) bytes of data. ^C --- 192.168.35.1 ping statistics --- 1 packets transmitted, 0 received, 1

I'm having trouble getting IP forwarding going in Ubuntu 12.04 server with UFW. I'm trying to get OpenVPN working.

Hey everyone,

I have a server that should be connected to two networks. One where it is connected via a router to the internet and another one connected to a local network. I make certain ports of the server available in the internet, via port-forwarding. As soon as I configure the second interface (eth1), which has a static IP configuration, connection attempts from the internet fail.

Good Afternoon,

I have a static IP setup for eth0 via the /etc/network/interfaces file. In gnome the same static IP got configured for eth3.

This is causing an IP conflict that causes the box to not be reachable from my remote location once Ubuntu desktop (gnome) has started.

Is there any way to change this configuration without having to boot into Gnome itself to do it?

Fedora 16 eth0 issues 31 weeks 4 days ago

Hi,

I'm currently going to school in a computer technician program and I'm in need of a some help to complete a lab. I currently have one f16 server and one f16 client running. They both have 2 interfaces.

eth0 = dhcp eth1 = static (private college network)

The issue I'm having is that my eth0 interface on my server isn't receiving any IPV4 address. My client is working fine.

Hi,

I have a pretty simple network and facing problem while setting routes.

Network @ a glance: ------------------- Linux machine (two eth interfaces) is in one side and the other end is connected to two Firewalls.

Hi All,

I have 2 NICs in my U9.04 Server box (eth0, eth1). After I added 2 virtual interfaces for each physical interface (eth0:1,eth0:2,eth1:1,eth1:2), the MAC addresses of all the interfaces have changed to that of eth0. Because eth1 was configured to be on my local network, I can't access the box remotely anymore.

lxc networking quesion 11 weeks 3 days ago

I have a similar requirement to the OP of this thread.

I want the following configuration:

-Physical host (PhyHost) reachable from the network at IP 10.1.101.89 -LXC container (LxcHost) reachable from the network at IP 10.1.101.95 Each contactable from the other.

OS = Ubuntu Server 12.04LTS

PhyHost /etc/network/interfaces

auto br0 iface br0 inet static address 10.1.101.89 netm