Re: [LARTC] Public Router using Private Links

["Martin A. Brown" <mabrown-lartc@securepipe.com>]

Walt,

Try this....the "src" keyword is a hint to the kernel about what address
to select on a given route.  This will only work if the kernel is asked to
select the source IP based on a route.

# ip route change default via $CURRENTGATEWAY src $IP_ON_ETH3

This might work before the change:

# ping -n -v -I $IP_ON_ETH3 www.yahoo.com

See also:

  http://linux-ip.net/html/routing-saddr-selection.html
  http://linux-ip.net/gl/ip-cref/node155.html

Good luck,

-Martin

 : I am running a public core router using private links from my provider.
 :
 : Details:
 : RH7.3
 : 9 interfaces (all Intel)
 : eth0 is default gateway and has a private IP address
 : all other interfaces are links to other routers or networks
 : eth3 has a public IP address
 :
 : The core router will rarely need to access sites out on the internet,
 : but when it does it cannot get there because the eth0 has a private IP
 : address. Is there a way to force the router to use the ip address from
 : eth3 to access sites on the internet? If so, how would I route traffic
 : originating from eth3 to the internet? I have tried a few policy
 : statements coupled with some separate rules and tables to no avail. All
 : I am getting is Destination host unreachable when I issue the command
 : "ping -v -I eth3 www.yahoo.com".
 :
 : Please advise. Thank you in advance.
 :
 : Walt
 :

-- 
Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com

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