Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ANLVM.CTD.ANL.GOV!B32357
From: B32357@ANLVM.CTD.ANL.GOV ("Linda Winkler,   312-972-7236")
Newsgroups: comp.protocols.tcp-ip
Subject: (none)
Message-ID: <8910260224.AA14579@ucbvax.Berkeley.EDU>
Date: 25 Oct 89 16:03:11 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 26

I have recently subnetted by Class B network and have a few questions/
problems.
Problem 1:  I have a Sun-3/280 running SunOS 3.5 and gated 1.9.1.3.
            My subnet mask is 0xfffffc00.  The Sun sends RIP updates
            with an IP destination address of 130.202.20.0 which is
            his broadcast address.  According to RFC1009, I believe
            this is an invalid address for an IP destination.
            It also causes machines on the network who do not
            subnet to send ARPs for destination 130.202.20.0
            because they think they should try to help out and
            forward the packets even though they are not gateways.
            The question is can I change the Sun's broadcast
            address under 3.5?  I have tried to set it to
            0xffffffff with no success.

Problem 2:  I have hosts who send a UDP packet to IP destination
            130.202.23.255.  I have three Suns acting as IP gateways
            (Sun OS 4.0 and 4.0.3) who rebroadcast the packet onto
            the same interface they received it on.  According to
            RFC1009 this is not allowed.  Because I have hosts on
            the network which do not understand subnetting, it
            causes a flurry of ARPs and rebroadcasts.  The question
            is why do the Suns rebroadcast the packet onto the
            same network/interface they received the packet on?

Thanks, Linda