[rhelv6-list] routing/interface question

[John Haxby]

On 26 June 2012 20:15, Kelly <kcobean at gmail.com> wrote:

> Peter Ruprecht <ruprech at ...> writes:
>
> >
> > Hi everyone,
> ...
> >
> > Does anyone know if there's a way to get RHEL 6 to give me the behavior
> > I'm used to with RHEL 5?  That is, how can I ping the interface on the
> > "other" subnet and actually get a reply?
> >
> > Thanks,
> > Peter Ruprecht
> >
>
> You'll need to set the rp_filter value to 0.  Right now, your RHEL6 host is
> configured to do strict source route checking, so if an interface receives
> a
> packet for which the reply interface is a different interface, the packet
> will
> be dropped.  Setting rp_filter to 0 allows the system to reply out a
> different
> interface than the packet was received on.  It's a sysctl parameter.
>
>
You're probably better of setting it to 2 (loose, rather than strict).

However, asymmetric routing is not necessarily a good idea so you would be
wise to investigate getting packets rto route out of the interface you'd
expect replies on.

jch
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