On Thu, Dec 30, 2010 at 9:33 AM, Daniel Hedlund <[email protected]> wrote:
> On Wed, Dec 29, 2010 at 16:06, Michael C. Robinson
> <[email protected]> wrote:
>> I don't want most packets to use a different routing table, just
>> the particular locally generated packets going to the updates site.
>> I figure that I need to use the iptables mangle table PREROUTING chain
>> and  mark the relevant packets to do this, but the only way I can get a
>> reaction is to use the POSTROUTING chain which seems pointless because
>> this chain takes effect after routing decisions have been made.
>
> Instead of dealing with iptables and rewriting packets, have you tried
> adding a host route using the "route add -host ..." command?
>
> Assuming you have two interfaces, eth0 and eth1, with eth0 being DSL
> and eth1 being Comcast...
>
> $> route add -host updates.opendns.com eth1
> $> route
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> ...
> 208.69.38.180   *               255.255.255.255 UH    0      0        0 eth1
> ...
>

And add a second host to your openDNS account and update each from the
associated interface.
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