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SubjectRe: 2.2.17 IP masq bug


On Fri, 1 Dec 2000, Ben McCann wrote:

> I'm curious about how ICMP redirect is causing this problem.
> Would you elaborate on how ICMP is involved?

The masq box sends ICMP redirects to the internal host
when the destination host is on the same shared media, i.e.
"please, go directly to the destination". When the internal host
accepts these redirects it reroutes the packets directly to the
destination which is on the same LAN. The packets reach the destination
with saddr=10/8 because they are not masqueraded. It seems the
destination does not use direct route to 10/8 and the traffic
is not replied. The connection is not established when it is not
masqueraded. When we block these redirects the internal hosts
continue to forward the packets to the masq box without knowing
the destination is directly connected.

> -Ben McCann


Julian Anastasov <>

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