[Simh] Connecting to Ethernet

Tue Sep 4 17:01:36 EDT 2012

Al 04/09/12 19:07, En/na david.d.miller at att.net ha escrit:
> Sergey
>
> I printed the data you asked for and made no changes to VAX because 
> they looked OK to me.  TCPIP SHOW ROUTE looped and produced no output.
>
> I appreciate your examination of this problem.
>
> Diagnostic data follows......
>
>
> On Linux(Ubuntu) IP: 10.0.0.2 kermel 2.6.38-15-generic .....
>
> david at Thinkpad:~/vax$ ifconfig
> br0       Link encap:Ethernet  HWaddr 00:16:36:29:e6:7b
>           inet addr:10.0.0.2  Bcast:10.0.0.255 Mask:255.255.255.0
>           inet6 addr: fe80::216:36ff:fe29:e67b/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500 Metric:1
>           RX packets:11 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:46 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:811 (811.0 B)  TX bytes:16459 (16.4 KB)
>
> eth0      Link encap:Ethernet  HWaddr 00:16:36:29:e6:7b
>           inet6 addr: fe80::216:36ff:fe29:e67b/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500 Metric:1
>           RX packets:81237 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:73843 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:80090941 (80.0 MB)  TX bytes:11682488 (11.6 MB)
>           Interrupt:16
>
> tap0      Link encap:Ethernet  HWaddr 86:bc:f0:f2:2c:de
>           UP BROADCAST MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:500
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>
>
> david at Thinkpad:~/vax$ brctl show
> bridge name    bridge id        STP enabled    interfaces
> br0        8000.00163629e67b    no        eth0
>                             tap0
> david at Thinkpad:~/vax$ brctl show br0
> bridge name    bridge id        STP enabled    interfaces
> br0        8000.00163629e67b    no        eth0
>                             tap0
> david at Thinkpad:~/vax$ brctl showmacs br0
> port no    mac addr        is local?    ageing timer
>   1    00:0d:4b:4b:3d:ab    no           6.52
>   1    00:16:36:29:e6:7b    yes           0.00
>   1    00:21:6a:75:6d:04    no          63.15
>   2    86:bc:f0:f2:2c:de    yes           0.00
>   1    e0:46:9a:58:62:14    no          31.61
> david at Thinkpad:~/vax$ route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    
> Use Iface
> 10.0.0.0        0.0.0.0         255.255.255.0   U 0      0        0 br0
> 0.0.0.0         10.0.0.1        0.0.0.0         UG 0      0        0 br0
>
> In SIMH ......
>
> sim> sho ver
> VAX simulator V3.8-1 [64b data, 64b addresses, Ethernet support]
> sim> show xq
> XQ, address=20001920-2000192F, no vector, MAC=08:00:2B:AA:BB:CC, 
> type=DELQA, poll=100, attached to tap0
>
> In OpenVMS V7.3  on node MYVAX   4-SEP-2012
>
> $ tcpip show interface /full
>  Interface: LO0
>    IP_Addr: 127.0.0.1         NETWRK: 255.0.0.0 BRDCST:
> MTU:  4096
>      Flags: UP LOOP NOARP MCAST SMPX
>                                   RECEIVE        SEND
>    Packets                              0           0
>      Errors                             0           0
>    Collisions:                          0
>
>  Interface: QE0
>    IP_Addr: 10.0.0.99         NETWRK: 255.0.0.0 BRDCST: 10.255.255.255
>  Cluster
>     C_Addr:                 C_NETWRK: C_BRDCST:
>                        Ethernet_Addr: 08-00-2B-AA-BB-CC MTU:  1500
>      Flags: UP BRDCST RUN MCAST SMPX
>                                   RECEIVE        SEND
>    Packets                              0           5
>      Errors                             0           0
>    Collisions:                          0
>
> $ tcpip show route /full
> MYVAX::SYSTEM 09:53:18 TCPIP$UCP CPU=00:00:03.15 PF=4490 IO=341 MEM=931
> MYVAX::SYSTEM 09:53:22 TCPIP$UCP CPU=00:00:03.15 PF=4502 IO=347 MEM=943
> MYVAX::SYSTEM 09:53:29 TCPIP$UCP CPU=00:00:03.16 PF=4502 IO=353 MEM=943
>  Interrupt
>
> SHOW ROUTE just hangs .. well, I see it's doing I/Os, but no results.
>
> $ mc tcpip$ping 10.0.0.2
>

The only weird thing I see is there is a mismatch between the netmasks 
you assigned in the linux side (255.255.255.0) and the VAX side 
(255.0.0.0). That COULD be the cause of the PING timeout. The cause for 
the SHOW ROUTE is that it tries to get the names associated to the 
addresses, so it does a DNS call which times out, hence the hang you are 
observing. Try to change the netmask to 255.0.0.0 in the linux side and 
tell us what happens. It _should_ work, unless you have some sort of 
firewall at the linux side preventing the ping succeeding.

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