I have a server running CentOS 7 and I connect to it by ssh. SSH takes a little bit to connect compared to the other server I have setup. This server has 2 ethernet ports (1 motherboard and 1 card). I use the card to create a bridge network for Kvm virtual machines and it works fine. There are times I can't ping or if I use the route command it hangs. I think it has to do with the default gateway for the main ethernet port.

Route when having issues

then I run sudo route add default gw 10.1.1.3 em1 or sudo route add default gw 10.1.1.3

I have added the default gateway to the /etc/sysconfig/network file, but still have issues.

Any ideas?

Thanks for the help.

P.S. I know that they should be static ip addresses and I'm working on it, but having to wait on the net admin.

First off you should not have two Default gateways.

Looking at what you have posted above it looks like the machine doesn't know what interface to use you have to clean up your network configuration. You should not be using the same network on both interfaces.

So would this solve it then?

cat /etc/sysconfig/network

route


Thanks for the help.

I think here is your problem;

Both interfaces are routing the same network. Your system doesn't know which interface it should send traffic through.

Right now or at least what I want is to have em1 dedicated to the main server and then p4p1 is being used for a bridge connection for Kvm virtual machines so br0 for vms. The server has 2 network cards one on the motherboard and one as a network card. Those cables go into a switch.

So what do I need to do to fix it? Sorry network knowledge is lacking, but I need to fix it.

P.S. I don't know if this matters or not, but some of the vms are only access local on the network while others have static ips setup for access outside of the network.

To fix this you will have to move one of the interfaces off the 10.1.1.0 network.

Sorry, but how do I do that and to what network then? since both of them still need to be accessed from outside the network and be able to access the outside network.

One thing you could do is split the 10.1.1.0 in to two networks.

10.1.1.0/25 or 255.255.255.128
10.1.1.128/25 or 255.255.255.128

Then place your Vm's on one network and your management on the other.

@lazydog

Thank you for the help. I will give that a try.