[Simh] Connecting to Ethernet
Sergey Oboguev
oboguev at yahoo.com
Tue Sep 4 13:53:22 EDT 2012
Hi David,
To begin with, on host side you have network mask for A-class IP address defined
as for C-class address.
Which is ok (or *may* be ok), but subnet/broadcast masks definitions mismatch on
host side and VAX side.
You need to have them equal.
This also distorts routing table on the host side.
Note "may" in "may be ok". Though A/B/C class scheme is supposed to be retured,
I'd rather stick to it until as initial step, just because not all software,
especially legacy software, may implement non-standard masking 100% correctly.
(As a matter of fact I have a set-up that uses A-class private subnet, but it
uses standard-size A class masks, i.e. 255.0.0.0 rather than 255.255.255.0.)
Fix this for a start and see what happens.
This said, it is suspicious that DELQA MAC address does not appear in list of
MAC addresses seen by the bridge and that tap0 counters are all 0.
But begin by fixing masks, do some pinging, and if it still does not work repost
new data.
Also see if SHOW DEVICE XQ /FULL indicates any errors.
- Sergey
________________________________
From: "david.d.miller at att.net" <david.d.miller at att.net>
To: simh at trailing-edge.com
Sent: Tue, September 4, 2012 10:10:52 AM
Subject: Re: [Simh] Connecting to Ethernet
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
Hangs as well.
--- On Mon, 9/3/12, Sergey Oboguev <oboguev at yahoo.com> wrote:
>From: Sergey Oboguev <oboguev at yahoo.com>
>Subject: Re: [Simh] Connecting to Ethernet
>To: david.d.miller at att.net, simh at trailing-edge.com
>Date: Monday, September 3, 2012, 5:34 PM
>
>
>Did you remember to configure the interface in TCP/IP services for OpenVMS?
>
>Assuming for the sake of example that your host uses IP address 192.168.21.3 for
>
>
>(initially) eth0 and (subsequently after bridging) br0, and assuming you want to
>
>assign
>
>IP address 192.168.21.200 to VAX instance, you need to configure QE0 inside VMS
>as follows:
>
> $ TCPIP SET INTERFACE QE0 /HOST=192.168.21.200
> $ TCPIP SET CONFIGURATION INTERFACE QE0 /HOST=192.168.21.200
>
>Depending on exact value of network addresses being used and network topology it
>
>
>may be necessary to additionally specify options /NETWORK_MASK=n.n.n.n and
>/BROADCAST_MASK=m.m.m.m, although usually VMS TCP/IP picks correct defaults for
>the masks.
>
>If it still does not work, please post the output of
>
> $ TCPIP SHOW INTERFACE /FULL
> $ TCPIP SHOW ROUTE /FULL
>
>and (in Linux)
>
> ifconfig br0
> ifcongig eth0
> ifconfig tap0
> brctl show
> brctl show br0
> brctl showmacs br0
> route -n
>
>and (at SIMH command console prompt)
>
> show xq
>
>Thanks,
>Sergey
>
>________________________________
>From: "david.d.miller at att.net" <david.d.miller at att.net>
>To: simh at trailing-edge.com
>Sent: Mon, September 3, 2012 4:10:48 PM
>Subject: Re: [Simh] Connecting to Ethernet
>
>
>Sergey
>
>That was a big help, but I'm not there yet. I did the following
>
>$ sudo ./ linux-tap.sh create br0 eth0 tap0 david
>$ sudo vax ; to start SIMH
>simh> ; the usual stuff
>simh> set xq mac=bla bla
>simh> att tap0 ; hooray, this is the first time this succeeded.
>simh> boot cpu
>
>When logged into VMS, I could PING and TELNET to LOCALHOST (and 127.0.0.1).
>But alas, not to my physical host. And my physical host can't see the VAX
>either.
>
>But I did so many things to get to this point that something else might be
>screwed up, so I need to reboot linux and start this drill again.
>
>Thanks for a great start!
>
>Any other suggestions?
>
>--- On Mon, 9/3/12, Sergey Oboguev <oboguev at yahoo.com> wrote:
>
>
>>From: Sergey Oboguev <oboguev at yahoo.com>
>>Subject: Re: [Simh] Basic questions
>>To: david.d.miller at att.net, simh at trailing-edge.com
>>Date: Monday, September 3, 2012, 12:20 PM
>>
>>
>>> In particular I get the following error:
>>> david at Thinkpad:~$ sudo brctl addbr br0
>>> david at Thinkpad:~$ sudo ifconfig tap0 up
>>> tap0: ERROR while getting interface flags: No such device
>>
>>Perhaps because
>>
>> /usr/sbin/tunctl -t $TAPDEV -u $USERID
>>
>>is missing.
>>
>>You may find the following script helpful:
>>http://oboguev.net/misc/linux-tap.sh.txt
>>
>>Usage is at the bottom or invokable as
>>
>> ./linux-tap.sh help
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.trailing-edge.com/pipermail/simh/attachments/20120904/3a10b7a4/attachment-0002.html>
More information about the Simh
mailing list