[Simh] VAX and networking on Linux/PPC

Tue Feb 26 11:59:49 EST 2013

Hello there,

Back with more problems with simh vax on linux/ppc. The earlier RAUSER problem
was fixed (thanks Mark!) so I went on to install VMS in the VM. Until I got to
networking...

I cannot get TCP/IP to work on it. The line isn't completely dead though - I
see some DECnet related traffic (endnode-hello) and there's outgoing packets as
well, but overall communications fail (I can't ping, telnet or whatever from
nor to the vax).

I tried the following simh networking setups:
- bridged setup with raw tapX device
- bridged setup with built-in tap:tapX (as documented in 0readme_ethernet.txt)
- bridged setup with "taptap" linked dual-tapX like in the 3.8 days
- direct connection of eth0 (without host networking at all)

Nothing works. I captured a tcpdump from a full boot sequence of this last setup:

	tcpdump: WARNING: eth0: no IPv4 address assigned
	tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
	listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
	17:38:31.041712 
	17:38:31.234374 

^^ DECnet MOP stuff (looks 'empty' unless I specify -vv, which spews a ton of garbage)

	17:38:32.287022 endnode-hello endnode vers 2 eco 0 ueco 0 src 1.42 blksize 1498 rtr 0.0 hello 15 data 2
	17:38:48.092170 endnode-hello endnode vers 2 eco 0 ueco 0 src 1.42 blksize 1498 rtr 0.0 hello 15 data 2

^^ More DECnet stuff

	17:38:59.086423 ARP, Request who-has 192.168.1.124 tell 192.168.1.124, length 46

^^ VMS broadcasts the network to find its own MAC address? Heh.

	17:39:02.327686 endnode-hello endnode vers 2 eco 0 ueco 0 src 1.42 blksize 1498 rtr 0.0 hello 15 data 2
	17:39:17.391732 endnode-hello endnode vers 2 eco 0 ueco 0 src 1.42 blksize 1498 rtr 0.0 hello 15 data 2
	17:39:33.593397 endnode-hello endnode vers 2 eco 0 ueco 0 src 1.42 blksize 1498 rtr 0.0 hello 15 data 2
	17:39:37.598483 ARP, Request who-has 192.168.1.1 tell 192.168.1.124, length 46
	17:39:37.598610 ARP, Reply 192.168.1.1 is-at 00:8e:f2:4b:f1:f0 (oui Unknown), length 50
	17:39:38.759549 ARP, Request who-has 192.168.1.1 tell 192.168.1.124, length 46
	17:39:38.759655 ARP, Reply 192.168.1.1 is-at 00:8e:f2:4b:f1:f0 (oui Unknown), length 50
	17:39:40.773536 ARP, Request who-has 192.168.1.1 tell 192.168.1.124, length 46
	17:39:40.773649 ARP, Reply 192.168.1.1 is-at 00:8e:f2:4b:f1:f0 (oui Unknown), length 50

^^ This is where I tried to ping 192.168.1.1 (my router) from 192.168.1.124
(the vax VMS). The ARP request gets on the network, and the reply enters the
eth0 device. VMS doesn't see it though, and reports "100% packet loss".

	17:39:47.350871 endnode-hello endnode vers 2 eco 0 ueco 0 src 1.42 blksize 1498 rtr 0.0 hello 15 data 2
	17:40:02.410429 endnode-hello endnode vers 2 eco 0 ueco 0 src 1.42 blksize 1498 rtr 0.0 hello 15 data 2
	17:40:10.000022 IP 192.168.1.200 > 192.168.1.124: ICMP echo request, id 18837, seq 1, length 64
	17:40:11.008192 IP 192.168.1.200 > 192.168.1.124: ICMP echo request, id 18837, seq 2, length 64
	17:40:12.016198 IP 192.168.1.200 > 192.168.1.124: ICMP echo request, id 18837, seq 3, length 64
	17:40:13.024136 IP 192.168.1.200 > 192.168.1.124: ICMP echo request, id 18837, seq 4, length 64
	17:40:15.005941 ARP, Request who-has 192.168.1.124 tell 192.168.1.200, length 50
	17:40:16.005870 ARP, Request who-has 192.168.1.124 tell 192.168.1.200, length 50
	17:40:17.005903 ARP, Request who-has 192.168.1.124 tell 192.168.1.200, length 50

^^ This is where I tried to ping the vax from my laptop. My ARP requests enter
the eth0, but the vax never replies.

Has anyone tried running simh VAX on a PowerPC machine? I'm stumped...  and an
OS without networking is pretty useless. :-)

Thanks,

Lennert

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