[CentOS] Network routes
Les Mikesell
lesmikesell at gmail.com
Tue Jan 29 23:24:37 UTC 2008
Jason Pyeron wrote:
> I am unable to ping NE.TW.RKB.IP1 from an outside network. Other machines
> which do not have access or routes for NET.WOR.KA.0 respond just fine.
>
> How do I get it to respond on both NET.WOR.KA.0 and NE.TW.RKB.0 given all
> default traffic should go through NET.WOR.KA.1 unless it is in reply to
> traffic from NE.TW.KB.1 or there is an outage.
You probably want to remove the default route through NE.TW.KB.1 and add
routes for the specific networks that you can reach though it. Normally
routing is done toward a destination network/address without regard to
the route of a packet you might be replying to. As for an 'outage', how
do you define/detect the outage? Normally if you want routes to be
determined dynamically you would set up a routing protocol with the
next-hop routers - or for simple failover the alternative gateway
routers might be configured via hsrp or vrrp to have a floating IP
address that the rest of the LAN uses as the default gateway address.
> [root at host20 ~]# route -n
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> NET.WOR.KA.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> NE.TW.RKB.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
> 0.0.0.0 NET.WOR.KA.1 0.0.0.0 UG 0 0 0 eth1
> 0.0.0.0 NE.TW.RKB.1 0.0.0.0 UG 20 0 0 eth0
>
--
Les Mikesell
lesmikesell at gmail.com
More information about the CentOS
mailing list