2 nic 2 gateway

[milos87]

Hello to everyone.

I have just installed PBX. I have problem.
Well, I have 2 NIC in the server, eth1 only for SIP with IP 10.1.xx.xx no internet acess, and the other eth0 with 192.168.xx.xx. LAN + Internet.

ifcfg for eth0
DEVICE=eth0
BOOTPROTO=static
ONBOOT='yes'
IPADDR=192.168.xx.xx
NETMASK=255.255.255.0
GATEWAY=192.168.xx.xx
ZONE=external

ifcfg for eth1
DEVICE=eth1
BOOTPROTO=static
ONBOOT='yes'
IPADDR=10.1.xx.xx
NETMASK=255.255.255.252
GATEWAY=10.1.xx.xx
ZONE=internal

How to setup one gw for eth0 and another for eth1.
Thanks in advance.

[TrevorH]

Don't put a GATEWAY= line in both ifcfg files or the last one to start will set the default route to that and that's not what you want.

You need to create a /etc/sysconfig/network-scripts/route-eth1 file and put ip route add x.x.x.x/yy via gg.aa.te.way/tt] lines in that but without the 'ip route add' portion of that. That will create specific routes for each x.x.x.x/yy subnets that you specify to go via the correct gateway.

[milos87]

TrevorH, thanks for the quick answer.

Well, i do this.

ifcfg for eth0

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DEVICE=eth0
BOOTPROTO=static
ONBOOT='yes'
IPADDR=192.168.3.xxx
NETMASK=255.255.255.0
GATEWAY=192.168.3.x
ZONE=external

new ifcfg for eth1

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DEVICE=eth1
BOOTPROTO=static
ONBOOT='yes'
IPADDR=10.1.19.22
NETMASK=255.255.255.252
ZONE=internal

create route-eth1

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10.1.19.22/30 via 10.1.19.21

And i got this

#netstat -rn

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Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.3.x     0.0.0.0         UG        0 0          0 eth0
10.1.19.20      0.0.0.0         255.255.255.252 U         0 0          0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1
192.168.3.x     0.0.0.0         255.255.255.0   U         0 0          0 eth0

[TrevorH]

10.1.19.20 21 22 and 23 are all within 10.1.19.20/30 (which is the same thing as 10.1.19.22/30). It probably doesn't add your route since it already knows it can reach .22 via that interface using the subnet mask. Use ip route get 10.1.19.22 (for example) to see which route it would take to get to your target ip.

[milos87]

This is what i got

# ip route get 10.1.19.22

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local 10.1.19.22 dev lo  src 10.1.19.22
    cache <local>

But now i have trouble with netmask if i use route-eth1 just like this

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10.1.19.22 via 10.1.19.21

#netstat -rn

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Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.3.x     0.0.0.0         UG        0 0          0 eth0
10.1.19.20      0.0.0.0         255.255.255.252 U         0 0          0 eth1
10.1.19.22      10.1.19.21      255.255.255.255 UGH       0 0          0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1
192.168.3.x     0.0.0.0         255.255.255.0   U         0 0          0 eth0

I also try this for route-eth1 and i lost route.

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ADDRESS0=10.1.19.22
NETMASK0=255.255.255.252
GATEWAY0=10.1.19.21

[TrevorH]

Wait, .22 appears to be your own ip address?

[milos87]

Wait, .22 appears to be your own ip address?

My mistake. I copied the wrong eth1 ip adress here. eth1 IPADDR=10.1.19.22

[TrevorH]

That's exactly the same ip address.