<div dir="auto">Thank you, Johnny, that's what I was referring to.<div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Sun, May 6, 2018, 4:32 AM Johnny Billquist <<a href="mailto:bqt@softjar.se">bqt@softjar.se</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">What Mark actually is talking about, and referring to, is the question <br>
if sending packets are also seen by others connected to the same <br>
interface and receiving packets.<br>
<br>
It's a bit more complicated than just saying "BSD" does this, or "Linux" <br>
does that. But the bottom line is that some systems, and some hardware, <br>
makes outgoing packets also visible to programs reading from the <br>
interface, and other combinations do not.<br>
<br>
And if you do not receive outgoing packets, then two virtual machines on <br>
the same host, using the same interface, cannot communicate with each other.<br>
<br>
Johnny<br>
<br>
On 2018-05-06 04:00, Mark Pizzolato wrote:<br>
> Mark,<br>
> <br>
> I’ve seen no evidence that anything has changed at all on Linux or other <br>
> operating systems. Changes have been made within simh to better <br>
> support some situations where bridges are used, but some sort of bridge <br>
> setup needs to be done like it did long ago.<br>
> <br>
> Please point at specifics of what you are seeing that now allows telnet <br>
> to an emulator’s IP address without setting up some sort of bridging.<br>
> <br>
> -Mark<br>
> <br>
> *From:*<a href="mailto:owner-hecnet@Update.UU.SE" target="_blank" rel="noreferrer">owner-hecnet@Update.UU.SE</a> [mailto:<a href="mailto:owner-hecnet@Update.UU.SE" target="_blank" rel="noreferrer">owner-hecnet@Update.UU.SE</a>] *On <br>
> Behalf Of *Mark Abene<br>
> *Sent:* Saturday, May 5, 2018 3:57 PM<br>
> *To:* <a href="mailto:hecnet@update.uu.se" target="_blank" rel="noreferrer">hecnet@update.uu.se</a><br>
> *Subject:* Re: [HECnet] Connections?<br>
> <br>
> Nothing of the sort. I'm saying that in the past, you couldn't telnet to <br>
> an emulator's IP address from within the same host server. Naturally the <br>
> host server has multiple IPs for all the emulated guest OSes. This was a <br>
> well known and well documented peculiarity of BSD and Linux when logged <br>
> into a shell on the host server. It's no longer the case on more recent <br>
> Linux systems.<br>
> <br>
> -Mark<br>
> <br>
> On Sat, May 5, 2018, 10:56 AM Mark Pizzolato <<a href="mailto:Mark@infocomm.com" target="_blank" rel="noreferrer">Mark@infocomm.com</a> <br>
> <mailto:<a href="mailto:Mark@infocomm.com" target="_blank" rel="noreferrer">Mark@infocomm.com</a>>> wrote:<br>
> <br>
> Hi Mark,<br>
> <br>
> I’m not understanding what you saying here.<br>
> <br>
> Are you suggesting that on a single host system, you’ve got multiple<br>
> independent simulators running which all are using the same IP<br>
> address as the host system? And, if true these devices can then, not<br>
> only uniquely communicate with remote systems (on the Internet say),<br>
> and also to each other AND the host system?<br>
> <br>
> -Mark<br>
> <br>
> *From:*<a href="mailto:owner-hecnet@Update.UU.SE" target="_blank" rel="noreferrer">owner-hecnet@Update.UU.SE</a> <mailto:<a href="mailto:owner-hecnet@Update.UU.SE" target="_blank" rel="noreferrer">owner-hecnet@Update.UU.SE</a>><br>
> [mailto:<a href="mailto:owner-hecnet@Update.UU.SE" target="_blank" rel="noreferrer">owner-hecnet@Update.UU.SE</a><br>
> <mailto:<a href="mailto:owner-hecnet@Update.UU.SE" target="_blank" rel="noreferrer">owner-hecnet@Update.UU.SE</a>>] *On Behalf Of *Mark Abene<br>
> *Sent:* Saturday, May 5, 2018 10:45 AM<br>
> *To:* <a href="mailto:hecnet@update.uu.se" target="_blank" rel="noreferrer">hecnet@update.uu.se</a> <mailto:<a href="mailto:hecnet@update.uu.se" target="_blank" rel="noreferrer">hecnet@update.uu.se</a>><br>
> *Subject:* Re: [HECnet] Connections?<br>
> <br>
> This is an often misunderstood generalization, with some people able<br>
> and others not. I remember this being true on *BSD. You could not<br>
> connect to a simulated IP on the same host. It *used* to also be<br>
> true on Linux, but is no longer the case for some time. On my ubuntu<br>
> server where I run dynamips, simh, and klh10, all on bridged taps, I<br>
> can telnet to all instances, even locally.<br>
> <br>
> -Mark<br>
> <br>
> On Sat, May 5, 2018, 12:27 AM Johnny Billquist <<a href="mailto:bqt@softjar.se" target="_blank" rel="noreferrer">bqt@softjar.se</a><br>
> <mailto:<a href="mailto:bqt@softjar.se" target="_blank" rel="noreferrer">bqt@softjar.se</a>>> wrote:<br>
> <br>
> On 2018-05-05 03:39, Robert Armstrong wrote:<br>
> >>since once Multinet grabs the interface, I can’t get to the<br>
> underlying<br>
> > host.<br>
> ><br>
> > Actually I think it’s a limitation in simh and the pcap<br>
> library – the<br>
> > simh guest OS can’t talk to the host OS on the same<br>
> interface. You can<br>
> > work around the problem with a TAP device. Check the<br>
> archives for the<br>
> > simh mailing list – it’s been discussed many times before.<br>
> <br>
> No. That is not correct. I run simh myself on a machine where I<br>
> have<br>
> both the native host and simh talking on the same ethernet. And<br>
> they are<br>
> both reachable by other hosts.<br>
> The OP must be doing something else funny.<br>
> <br>
> Johnny<br>
> <br>
> -- <br>
> Johnny Billquist || "I'm on a bus<br>
> || on a psychedelic trip<br>
> email: <a href="mailto:bqt@softjar.se" target="_blank" rel="noreferrer">bqt@softjar.se</a> <mailto:<a href="mailto:bqt@softjar.se" target="_blank" rel="noreferrer">bqt@softjar.se</a>> || <br>
> Reading murder books<br>
> pdp is alive! || tryin' to stay hip" - B. Idol<br>
> <br>
<br>
-- <br>
Johnny Billquist || "I'm on a bus<br>
|| on a psychedelic trip<br>
email: <a href="mailto:bqt@softjar.se" target="_blank" rel="noreferrer">bqt@softjar.se</a> || Reading murder books<br>
pdp is alive! || tryin' to stay hip" - B. Idol<br>
</blockquote></div>