SUMMARY: a non routing problem.

From: Massimo Mentrasti (
Date: Tue Apr 20 1993 - 17:21:25 CDT

Sorry for the delay in posting this summary, I've been on holiday for a week.

My original question:

> I installed the sunlink X.25 on a SPARCserver 4/470, running Sun0S 4.1.3 to
> connect my site to the TCP/IP world.
> Obviuosly this server has two IP address, one related to the X.25 interface
> (std0) and another related to the standard ethernet interace (ie0).
> At the moment every packet from the outside networks is routed to the
> inside network by this server.
> How could I configure my server to avoid that it routes packets from the
> outside networks to the inside network unless the packets have the
> server address as their destination or their origination address ?

All the people suggested me to disable IP forwarding adding the following
line to the kernel configuration file:

options "IPFORWARDING=-1" # Never forward , see /sys/netinet/in_proto.c

I have reconfigured the kernel according to the instruction in the System
And Network Administration manual and rebooted. It seems to work.

Many thanks to:

Lutz Brunke <
Marc P. Rinfret <>
trdlnk! (Michael Sullivan)
Christian Lawrence <>
davidl@Newbridge.COM (David Law)
Mr T Crummey (DIJ) <> (Rod Livingood)
Barry Margolin <barmar@Think.COM>

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