Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!olivea!spool.mu.edu!caen!zaphod.mps.ohio-state.edu!ncar!woods
From: woods@ncar.ucar.edu (Greg Woods)
Newsgroups: comp.dcom.sys.cisco
Subject: Re: Cisco and Yellow Pages
Message-ID: <11969@ncar.ucar.edu>
Date: 27 Jun 91 20:27:21 GMT
References: <1991Jun27.104339.65104@pttrnl.nl>
Reply-To: woods@ncar.UCAR.EDU (Greg Woods)
Organization: Scientific Computing Division/NCAR, Boulder CO
Lines: 25

In article <1991Jun27.104339.65104@pttrnl.nl> thissen@pttrnl.nl writes:
>We tried to solve this problem with the configuring of a helper address
>in the cisco-router, so UDP broadcasts are forwarded. It didn't work.

The problem is that the helper-address command only forwards a specific
set of UDP port numbers by default, which does not, unfortunately,
include the sunrpc (portmapper) port.  The only solution is to
explicitly list the UDP port numbers to forward to the helper address,
using the "ip forward-protocol" command.  We have something like this:

ip forward-protocol udp 67
ip forward-protocol udp 68
ip forward-protocol udp 69
ip forward-protocol udp 42
ip forward-protocol udp 53
ip forward-protocol udp 37
ip forward-protocol udp 137
ip forward-protocol udp 138
ip forward-protocol udp 49
ip forward-protocol udp 111

It is port 111 (sunrpc) that is missing from the default list of port numbers
for helper addresses, and YP/NIS broadcasts need this port.

--Greg