[CentOS] Simple routing question

Leon Fauster leonfauster at googlemail.com
Tue Sep 4 17:34:13 EDT 2012


Am 04.09.2012 um 20:34 schrieb James B. Byrne:
> We use a dual homed CentOS-6.3 host for our Internet gateway router. 
> Its internal nic (eth1) is configured such that the address
> 192.168.0.1 is one of its aliases.
> 
> # cat /etc/sysconfig/network-scripts/ifcfg-eth1:192BOOTPROTO=none
> BROADCAST=192.168.255.255
> DEVICE=eth1:192

^^^^^^^^

> IPADDR=192.168.0.1
> IPV6INIT=no
> MTU=""
> NAME="LAN - Non-routable"
> NETMASK=255.255.0.0
> NETWORK=192.168.0.0
> ONBOOT=yes
> ONPARENT=yes
> 
> Internal packets routed to 192.168.209.41 are passing through this
> router out onto the network.  I am afraid that the reason is not
> evident to me and I have been unable to locate an answer.
> 
> The primary address for eth1 has the following configuration:
> 
> # cat /etc/sysconfig/network-scripts/ifcfg-eth1
> BOOTPROTO=none
> BROADCAST=""
> DEFROUTE=yes
> DEVICE=eth1

^^^^^^^^^

> DOMAIN="hamilton.harte-lyne.ca harte-lyne.ca"
> GATEWAY=216.xxx.yyy.53
> HWADDR=00:25:90:60:11:8D
> IPADDR=216.xxx.xxx.1
> IPV4_FAILURE_FATAL=yes
> IPV6_AUTOCONF=yes
> IPV6_DEFROUTE=yes
> IPV6_FAILURE_FATAL=no
> IPV6INIT=yes
> IPV6_PEERDNS=yes
> IPV6_PEERROUTES=yes
> MACADDR=""
> MTU=""
> NAME="LAN Link - eth1"
> NETMASK=""
> NETWORK=""
> NM_CONTROLLED=no
> ONBOOT=yes
> PREFIX=24
> TYPE=Ethernet
> UUID=9c92fad9-6ecb-3e6c-eb4d-8a47c6f50c04
> 
> What configuration setting am I missing that will cause packets to
> 192.168.ccc.ddd to stay on the LAN and not try and pass though the WAN
> interface?


Is it correct to set the internal net as alias on the public 
interface (216.xxx.xxx.1) - both via eth1?  This is for sure 
not your intention. Maybe a typo ...

--
LF
 




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