Before starting to dig into traffic captures I'd like to try two more things:
* a OpenVMS 7.3 setup on a new SIMH machine - if that works then I can think about migrating users and data from 7.2 * using a different ethernet card to rule out layer 1 problems This problem is not easily reproducible, "it just happens", so I can only report back after a certain amount of time. Thanks for now 2014-04-30 16:59 GMT+02:00 Mark Pizzolato - Info Comm <[email protected]>: > As Rick suggested, you should capture traffic in both directions. > Wireshark is an excellent tool for that. Additionally, Wireshark has > built-in protocol decoders which can interpret what is happening in the TCP > telnet session. If you aren’t familiar with, or don’t want to dig into the > details of the packet innards, you can save the capture contents, make it > available, and let me or someone else can interpret the details and offer > analysis. > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Lorenzo > *Sent:* Wednesday, April 30, 2014 7:25 AM > *To:* Rick Murphy > *Cc:* [email protected] > *Subject:* Re: [Simh] OpenVMS 7.2 VAX telnet failure > > > > What nmap is reporting should be the traffic from the VAX to the client. > No matter the client I use (e.g. telnet.exe, PuTTY...), all I get is an > endless stream of chars, which matches what appears in the traffic dump. > > Upgrading to SIMH 4.0 beta had no effect - after 14 hours I experienced > the same exact problem. > > During the telnet outage, which happened after ~14 hours of SIMH running, > FTP was still working fine. > > > > 2014-04-30 2:50 GMT+02:00 Rick Murphy <[email protected]>: > > At 06:21 PM 4/29/2014, Lorenzo wrote: > > Hi! > I'm running OpenVMS 7.2 VAX on a simh emulator, latest release > > (V3.9-0 from <http://simh.trailing-edge.com>simh.trailing-edge.com) and > compiled with networking (libpcap, no vde). > > > The emulator has got its own network card to which it's attached. > The host operating system is Linux, kernel 3.11. > My issue is that after an apparently random amount of time (usually a few > hours) the telnet server stops working. > I can't get any client to log in remotely - as soon as I connect to the > OpenVMS machine, > all I get is a blank character sequence, as follows (dumped by nmap): > > SF:NULL,1138,"\xff\xfb\x01\xff\xfb\x03\xff\xff\xff\xff\0\0\0\0\0\0\0\0\0\0 > > > > There's a beginning of some TELNET options negotiation going on there. > > That's the following: > 255 (IAC) > 251 (WILL) > 1 (ECHO) > 255 (IAC) > 251 (WILL) > 3 (SGA) [Suppress go-ahead) > > That's pretty standard. > The series of 0xff (IACs) and nulls that follow aren't. > > You really need to capture the traffic to-and-from. Is this coming from > the VAX to your client, or vice versa? > -Rick > > >
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