[Simh] FW: FW: FTP client connecting to SIMH/OpenVMS?

Peter Moreton petermoreton at hotmail.co.uk
Thu Jun 12 03:36:53 EDT 2008


Of course, very good point. I have a couple of spare PCMCIA NIC's, so could do this at no cost.
FYI, I found that the freeware, open source C# FTP library from http://www.enterprisedt.com/ works flawlessly with the OpenVMS/UCX FTP server, unlike the half-baked Microsoft FTP class.
 
 



> Date: Wed, 11 Jun 2008 19:34:58 -0400> From: eaberry1 at pacbell.net> To: petermoreton at hotmail.co.uk> CC: simh at trailing-edge.com> Subject: Re: [Simh] FW: FW: FTP client connecting to SIMH/OpenVMS?> > NIC cards are very cheap these days, even for laptops. If your laptop has> on-board NIC, you can buy a cardbus 2nd NIC adaptor. Let Windows use one and> the vax use the other. While commuting you can connect them with a 6"> crossover cable. (If the guy in the next seat asks what that's for, you can> say it's a jury-rigged carrying handle; or explain that your computer is> schizophrenic and the cable is so the left brain can talk to the right.)> When you get home you remove the crossover cable and connect both to your> cable router.> > Peter Moreton wrote:> > Thanks for that insight Brad (and others). FYI, the issue affects XP> > as well as Linux. Now I am aware of the issue, I can work by using a> > PC on the LAN as a client and a PC on the LAN running SIMH, instead> > of both Client and SIMH on the same machine. Of course this means I> > cannot now develop client-server apps on one laptop while commuting> > on train, but hey.... > > > > > > > > ------------------------------------------------------------------------> > > > > From: brad at heeltoe.com> > > To: jeremy at vsm.com.au> > > CC: petermoreton at hotmail.co.uk; simh at trailing-edge.com> > > Subject: Re: [Simh] FW: FTP client connecting to SIMH/OpenVMS?> > > Date: Tue, 10 Jun 2008 20:01:00 -0400> > >> > >> > > Jeremy Begg wrote:> > > >Peter,> > > >> > > >>I just found that I *can* FTP and Telnet into the VMS machine from> > > >>another Physical host on the LAN - so it seems as though TCP/IP> > traffic> > > >>between VMS and the PC running SIMH isn't routing, but so long as I> > > >>connect to the VMS machine from another PC on the LAN, then the VAX> > > >>responds as it should.> > > >> > > >I believe this is a known problem with SIMH (actually I believe> > it's a> > > >problem in the underlying networking library used by SIMH). To> > > >communicate between the host PC and the emulated VAX, the host PC> > > >needs to have an ethernet NIC which is dedicated to the VAX.> > >> > > if simh is running on linux, it's a long standing issue with> > linux (and> > > possibly every other unix)> > >> > > Depending on what sort of network "tap" you use to simulate the> > ethernet> > > you may not be able to access the simulated host from the host> > machine.> > > You can, however, access it from any other host on the network.> > >> > > I figured out exactly what the issue was years ago and asked the> > linux> > > networking community about it - the response was that most people> > didn't> > > notice or care and fixing it was hard.> > >> > > It happens more and more now that people are doing emulators as> > machines> > > get faster. I've run into before. I think I got around it last by> > > using an IP level tap internet (i.e. creating a new interface)> > but that> > > has it's own set of issues.> > >> > > I as I recall (dimly), if you use an ethernet level tap, the ethernet> > > driver has to duplicate each packet sent and pass them back up to the> > > simulator socket. Likewise, all packets received have to be> > duplicated> > > and sent to the simulator socket. I think right now the receive side> > > happens but not the transmit side.> > >> > > Typing it here is seems simple to fix but it didn't look easy at the> > > time. Ah yes. the problem is you also want to send packets back> > to the> > > host if they originated in the sim. but you don't know who sent> > them in> > > the ethernet driver (very low level). so you risk sending packets> > back> > > to the host which originated in the host and packets back to the sim> > > which originated in the sim.> > >> > > basically, you want to simulate a mini ethernet wire. I guess you> > > could do some sort of simple learning bridge.> > >> > > Hopefully this illustrates the problem and some of the complexity.> > >> > > anyway, simh suffers this problem as do many emulators.> > >> > > -brad> > >> > > > > > ------------------------------------------------------------------------> > Get 5GB of online storage for free! Get it Now!> > <http://clk.atdmt.com/UKM/go/msnnkmgl0010000005ukm/direct/01/>> > > > > > ------------------------------------------------------------------------> > Miss your Messenger buddies when on-the-go? Get Messenger on your > > Mobile! <http://clk.atdmt.com/UKM/go/msnnkmgl0010000001ukm/direct/01/>> > > > > > ------------------------------------------------------------------------> > > > _______________________________________________> > Simh mailing list> > Simh at trailing-edge.com> > http://mailman.trailing-edge.com/mailman/listinfo/simh> 
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