RE: Network routes

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> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx 
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Ross S. W. Walker
> Sent: Tuesday, January 29, 2008 17:38
> To: CentOS mailing list
> Subject: RE:  Network routes
> 
> 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.RKB.1 or there is an outage.
> > 
> > [root@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
> > 
> > [root@host20 ~]# ifconfig
> > eth0      Link encap:Ethernet  HWaddr 00:17:31:0F:04:AE
> >           inet addr:NE.TW.RKB.IP1  Bcast:NE.TW.RKB.255  
> > Mask:255.255.255.0
> > eth0:pn   Link encap:Ethernet  HWaddr 00:17:31:0F:04:AE
> >           inet addr:192.168.1.20  Bcast:192.168.1.255  
> > Mask:255.255.255.0
> > eth1      Link encap:Ethernet  HWaddr 00:01:03:E9:42:D0
> >           inet addr:NET.WOR.KA.IP2  Bcast:NET.WOR.KA.255  
> > Mask:255.255.255.0
> > lo        Link encap:Local Loopback
> >           inet addr:127.0.0.1  Mask:255.0.0.0
> > 
> 
> You can have only 1 default route.
> 
> You can use RIP or some other routing protocol to
> advertise defualt routes to the host from the
> gateways based upon route availability or weight,
> or you can deploy reverse NAT'ing on the gateways
> so external IPs will be masqueraded as the
> internal IP of the gateway and thus be routed to
> the appropriate gateway based on which IP they
> arrived on.
> 
> -Ross
> 

But I have 2 physical network cards, on 2 different networks. Should they
not both have default routes?

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-                                                               -
- Jason Pyeron                      PD Inc. http://www.pdinc.us -
- Sr. Consultant                    10 West 24th Street #100    -
- +1 (443) 269-1555 x333            Baltimore, Maryland 21218   -
-                                                               -
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