is the host you are running simh on using intel ethernet chips? i've
experienced those chips gluing two packets together a lot, especially 
while driving the card in both directions by bpf. 

just a thought. 
isildur

On Mon, 28 Oct 2002, Olaf Seibert wrote:

> On Sat 26 Oct 2002 at 08:59:11 -0700, Jason R Thorpe wrote:
> > On Sat, Oct 26, 2002 at 05:28:16PM +0200, Olaf Seibert wrote:
> > 
> >  > Thanks, I'll try that. A pity that isn't in 1.6 then.
> > 
> > It came to my attention after 1.6 was released.  It will be in 1.6.1.
> 
> Ok. I rebuilt my recently cvs-ed sources, forced simh-vax to link with
> the new libpcap (1.3 (maybe that is not yet new enough?)), and now it
> works better but I still get the warnings.
> 
> # dhclient
> Internet Software Consortium DHCP Client V3.0rc10
> Copyright 1995-2001 Internet Software Consortium.
> All rights reserved.
> For info, please visit http://www.isc.org/products/DHCP
> 
> qe0: discarding oversize frame (len=1980)
> qe0: discarding oversize frame (len=1980)
> qe0: discarding oversize frame (len=1980)
> qe0: discarding oversize frame (len=1980)
> Oct 26 17:52:44  /netbsd: qe0: discarding oversize frame (len=1980)
> Listening on BPF/qe0/08:00:2b:aa:bb:cc
> Sending on   BPF/qe0/08:00:2b:aa:bb:cc
> Sending on   Socket/fallback
> DHCPDISCOVER on qe0 to 255.255.255.255 port 67 interval 3
> qe0: discarding oversize frame (len=2090)
> Oct 26 17:52:45  last message repeated 3 times
> Oct 26 17:52:49  /netbsd: qe0: discarding oversize frame (len=2090)
> DHCPOFFER from 10.0.0.5
> DHCPREQUEST on qe0 to 255.255.255.255 port 67
> DHCPACK from 10.0.0.5
> New Network Number: 10.0.0.0
> New Broadcast Address: 10.0.0.255
> 
> qe0: discarding oversize frame (len=1980)
> qe0: discarding oversize frame (len=1980)
> qe0: discarding oversize frame (len=1980)
> Oct 26 17:52:52  /netbsd: qe0: discarding oversize frame (len=1980)
> bound to 10.0.0.249 -- renewal in 36067 seconds.
> # qe0: discarding oversize frame (len=2090)
> Oct 26 17:52:52  last message repeated 2 times
> Oct 26 17:53:04  /netbsd: qe0: discarding oversize frame (len=2090)
> 
> Pinging the host machine on the address that belongs to the same
> interface as that simh-vax is using does not work however. Pinging other
> hosts on that network cable works. Since the default route is via the
> host machine, pinging anything else also fails. I see ARP requests going
> out on the wire:
> 
> tcpdump: listening on ne0
> 01:01:40.401620 arp who-has azenomei.falu.nl tell dhcp249.falu.nl
> 
> but no answers. (tcpdump also running on the same host machine)
> 
> After manually installing an arp table entry, I see pings going out, but
> no answers:
> 
> tcpdump: listening on ne0
> 01:03:26.177339 dhcp249.falu.nl > azenomei.falu.nl: icmp: echo request
> 
> I suppose that the packets just go out on the wire and are not processed
> as incoming packets locally on the host. Except that I wonder then why
> the dhcp worked - that server is also on the same machine.
> 
> Also, I tried a tcpdump inside simh-vax, and I suppose the promiscuous
> mode setting has no effect, since I saw no packets until I specifically
> sent some to it.
> 
> Pinging from the host, while tcpdump was running in simh-vax, gave this:
> 
> tcpdump: listening on qe0
> qe0: discarding oversize frame (len=2090)
> Oct 26 18:10:00  /netbsd: qe0: discarding oversize frame (len=2090)
> 18:10:00.570000 arp who-has 10.0.0.249 tell 10.0.0.5
> qe0: discarding oversize frame (len=2090)
> 18:10:01.660000 arp who-has 10.0.0.249 tell 10.0.0.5
> qe0: discarding oversize frame (len=2090)
> 18:10:02.690000 arp who-has 10.0.0.249 tell 10.0.0.5
> qe0: discarding oversize frame (len=2090)
> 18:10:03.970000 arp who-has 10.0.0.249 tell 10.0.0.5
> Oct 26 18:10:03  last message repeated 3 times
> 
> I suppose I should have seen the ARP replies at least from this side,
> but I see none. Or would the "oversized frame" be a sent frame instead
> of a received frame (as I was assuming)?
> 
> 
> >         -- Jason R. Thorpe <thorpej@wasabisystems.com>
> -Olaf.
> -- 
> ___ Olaf 'Rhialto' Seibert - rhialto@       -- Woe betide the one who feels
> \X/ polderland.nl  -- remorse without sin - Tom Poes, "Het boze oog", 4444.
>