[Simh] SIMH Ethernet Mac OS X

[Frederik Meerwaldt]

Dear SIMH-Users,

I have compiled the most recent version of the SIMH (V3.7-1) on my  
Mac OS X 10.4.10 Intel System (MacBook Pro).
For that I downloaded the most recent version of libpcap (v0.9.6) and  
compiled that and linked against this one.

I installed OpenVMS/vax 7.3 in the virtual machine and everything  
except networking works very well.
I initialize the Ethernet-Device by using the following lines in my  
vax.ini file:
set xq mac=08-00-2B-A1-B2-C3
attach xq en0
My en0-Device looks like:
en0: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST>  
mtu 1500
         inet 10.0.0.1 netmask 0xff000000 broadcast 10.255.255.255
         ether 00:16:cb:90:22:0c
         media: autoselect status: inactive
(I know that the media-status is inactive, because I am using en1  
(Wireless LAN), but attaching to en1 doesn't work and as I just need  
it as a kind of 'loopback' (Mac OS X Host <-> Emulated VMS System)  
this is enough for me.
My OpenVMS-System has the IP 10.0.0.2. If I ping the OSX-Host from  
the OVMS-System, I see the following lines in tcpdump -i en0:
14:21:40.068370 arp who-has 10.0.0.1 tell 10.0.0.2

But unfortunately the Mac-Box does not reply.
In the other way, things look SOMEWHAT better, but not fully - when I  
ping the OVMS-System from the OSX-Host I see:
14:22:40.007265 arp who-has 10.0.0.2 tell 10.0.0.1
14:22:40.015508 arp reply 10.0.0.2 is-at aa:00:04:00:02:c0 (oui Unknown)
[ these two packets repeat while pinging ]

It seems like the emulated OpenVMS-Machine receives the packets which  
are sent to the en0 ethernet-device, but the Mac OS X Host doesn't  
care about the packets on en0 (because the OVMS-Box is answering to  
the ARP-Request but Mac OS X doesn't care).
When I manually add the OVMS-Box to the arp-list on the OSX-Host by  
entering:
sudo arp -s 10.0.0.2 aa:00:04:00:02:c0
I even get the replies of the VMS Host in the tcpdump:
14:26:35.558787 IP 10.0.0.1 > 10.0.0.2: ICMP echo request, id 26950,  
seq 7, length 64
14:26:35.566451 IP 10.0.0.2 > 10.0.0.1: ICMP echo reply, id 26950,  
seq 7, length 64
14:26:36.558839 IP 10.0.0.1 > 10.0.0.2: ICMP echo request, id 26950,  
seq 8, length 64
14:26:36.560080 IP 10.0.0.2 > 10.0.0.1: ICMP echo reply, id 26950,  
seq 8, length 64
[...]

But again OSX just doesn't care about these packets - that's all the  
problem.
For Linux-Boxes I read about adding a mirror device so that this  
works... I don't have Linux and a mirror device (and I couldn't find  
a mirror device driver for OSX), so I would really appreciate another  
solution.

... while I'm already bothering you:
Anyone knows why attaching to the second ethernet device (a WLAN- 
Device in this case) doesn't work?:
sim> attach xq0 en1
File open error

(running simh as root)

I really really would appreciate running a local VMS Box (so I have a  
portable VAX).
Many thanks in advance,

Freddy