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Date:      Wed, 06 May 1998 13:06:39 -0600
From:      Clod Baldrick <baldrick@rmsq.com>
To:        Andrew Short <Ashort@concentric.net>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Bizarre routing problem
Message-ID:  <3550B4BF.4FB981D@rmsq.com>
References:  <Pine.SUN.3.96.980506145529.1465H-100000@viking.cris.com>

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Thanks for the suggestion, Andrew.

Andrew Short wrote:
> Help more....need the ifconfig of the interfaces that are trying to talk
> to each other.  As a blind guess, make sure they have the same subnet mask
> AND broadcast address, because the broadcast address is both the send and
> receive address for the arp that goes out when you ping an address onthe
> same subnet.  If an interface isn't listening on the right broadcast
> address, it will go right over the interface and never see that it is
> being pinged.

Yep, that was one of the things I thought of.

FreebSD:
tomcat$ ifconfig ed2
ed2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 130.13.21.92 netmask 0xffffff00 broadcast 130.13.21.255
        ether 00:c0:0c:b0:5e:92 

Linux:
lancaster$ ifconfig eth0
eth0      Link encap:10Mbps Ethernet  HWaddr 00:A0:24:72:12:A7
          inet addr:130.13.21.91  Bcast:130.13.21.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1330492 errors:65 dropped:65 overruns:0
          TX packets:3378032 errors:0 dropped:0 overruns:0
          Interrupt:3 Base address:0x360 

(BTW: as far as I can tell, the 65 error/dropped packets on this interface
are packets that I've sent from tomcat.)

Regards.

-- 
Clod Baldrick
RMS, Longmont CO

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