[Simh] Packet Loss

[Johnny Billquist]

"Between simulators" ...?

So you are running two simulators, and if I understand all of your text 
correctly, you have the same MAC address on both of them?

In that case, I would indeed expect for each one, to on average only get 
a 50% success rate on ping packets.

	Johnny

On 2016-08-23 19:12, David Coolbear wrote:
> I have simh running on a Linux host. When I installed simh (compiled
> from source) the host was running OpenSUSE 13.1. It subsequently was
> upgraded to 13.2. The Linux host has two NICs - one of them is dedicated
> to simh. The host os loads the kernel module for the NIC and admins it
> up, but does not configure an IP address. Both NICs are cabled into a
> gig-e switch and the switch is cabled into a cable modem.
>
> When the host was running OpenSUSE 13.1, networking on simh worked
> perfectly. I'm not certain, but I suspect that it also worked perfectly
> under 13.2. I recently ran both the PDP11 simulator and the VAX
> simulator. Both of these had about 50% packet loss when pinging between
> simulators or between the Linux host and either simulator.
>
> The pertinent portion of the simh initialization file looks like this:
>   set xq mac=08-00-2B-AA-BB-CC
>   at xq enp4s1
>
> Where the host's Etherent device is /dev/enp4s1.
>
> Versions look like this:
>   Host OS = OpenSUSE 13.2
>   simh version = V3.9-0
>   libpcap1-32bit-1.6.2-1.2.x86_64
>   libpcap1-1.6.2-1.2.x86_64
>   libpcap-devel-32bit-1.6.2-1.2.x86_64
>   libpcap-devel-1.6.2-1.2.x86_64
>
> The pdp11 simulator starts up normally...
>   PDP-11 simulator V3.9-0
>   libpcap version 1.6.2
>   Eth: opened OS device enp4s1
>   Disabling CR
>
>   73Boot from ra(0,0,0) at 0172150
>   :
>
> ...and networking does work a bit, but shows heavy packet loss...
>
>   # /etc/netstart
>   Assuming NETWORKING system ...
>   add host spdp11: gateway localhost
>   add net default: gateway 192.168.1.1
>   # ping 192.168.1.1
>   PING 192.168.1.1 (192.168.1.1): 56 data bytes
>   64 bytes from 192.168.1.1 <http://192.168.1.1>: icmp_seq=1 ttl=64
> time=933.352 ms
>   64 bytes from 192.168.1.1 <http://192.168.1.1>: icmp_seq=2 ttl=64
> time=266.672 ms
>   64 bytes from 192.168.1.1 <http://192.168.1.1>: icmp_seq=3 ttl=64
> time=250.005 ms
>   ^C
>   --- 192.168.1.1 ping statistics ---
>   5 packets transmitted, 3 packets received, 40% packet loss
>   round-trip min/avg/max = 250.005/0/933.352 ms
>   #
>
> Any ideas why this would be?
>
>
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