[HECnet] Connections?

[Mark Abene]

You're confusing everything I'm saying. Let's just skip it.


On Sat, May 5, 2018, 7:00 PM Mark Pizzolato <Mark at infocomm.com> wrote:

> Mark,
>
>
>
> I’ve seen no evidence that anything has changed at all on Linux or other
> operating systems.   Changes have been made within simh to better support
> some situations where bridges are used, but some sort of bridge setup needs
> to be done like it did long ago.
>
>
>
> Please point at specifics of what you are seeing that now allows telnet to
> an emulator’s IP address without setting up some sort of bridging.
>
>
>
> -          Mark
>
>
>
> *From:* owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] *On
> Behalf Of *Mark Abene
> *Sent:* Saturday, May 5, 2018 3:57 PM
> *To:* hecnet at update.uu.se
> *Subject:* Re: [HECnet] Connections?
>
>
>
> Nothing of the sort. I'm saying that in the past, you couldn't telnet to
> an emulator's IP address from within the same host server. Naturally the
> host server has multiple IPs for all the emulated guest OSes. This was a
> well known and well documented peculiarity of BSD and Linux when logged
> into a shell on the host server. It's no longer the case on more recent
> Linux systems.
>
>
>
> -Mark
>
>
>
>
>
> On Sat, May 5, 2018, 10:56 AM Mark Pizzolato <Mark at infocomm.com> wrote:
>
> Hi Mark,
>
>
>
> I’m not understanding what you saying here.
>
>
>
> Are you suggesting that on a single host system, you’ve got multiple
> independent simulators running which all are using the same IP address as
> the host system? And, if true these devices can then, not only uniquely
> communicate with remote systems (on the Internet say), and also to each
> other AND the host system?
>
>
>
> -          Mark
>
>
>
> *From:* owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] *On
> Behalf Of *Mark Abene
> *Sent:* Saturday, May 5, 2018 10:45 AM
> *To:* hecnet at update.uu.se
> *Subject:* Re: [HECnet] Connections?
>
>
>
> This is an often misunderstood generalization, with some people able and
> others not. I remember this being true on *BSD. You could not connect to a
> simulated IP on the same host. It *used* to also be true on Linux, but is
> no longer the case for some time. On my ubuntu server where I run dynamips,
> simh, and klh10, all on bridged taps, I can telnet to all instances, even
> locally.
>
>
>
> -Mark
>
>
>
>
>
>
>
> On Sat, May 5, 2018, 12:27 AM Johnny Billquist <bqt at softjar.se> wrote:
>
> On 2018-05-05 03:39, Robert Armstrong wrote:
> >>since once Multinet grabs the interface, I can’t get to the underlying
> > host.
> >
> >    Actually I think it’s a limitation in simh and the pcap library – the
> > simh guest OS can’t talk to the host OS on the same interface.  You can
> > work around the problem with a TAP device.  Check the archives for the
> > simh mailing list – it’s been discussed many times before.
>
> No. That is not correct. I run simh myself on a machine where I have
> both the native host and simh talking on the same ethernet. And they are
> both reachable by other hosts.
> The OP must be doing something else funny.
>
>    Johnny
>
> --
> Johnny Billquist                  || "I'm on a bus
>                                    ||  on a psychedelic trip
> email: bqt at softjar.se             ||  Reading murder books
> pdp is alive!                     ||  tryin' to stay hip" - B. Idol
>
>
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