<div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr">On Tue, Aug 14, 2018 at 2:27 PM Ondrej Zajicek <<a href="mailto:santiago@crfreenet.org">santiago@crfreenet.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Mon, Aug 13, 2018 at 03:14:10PM +0200, Jakub Nowacki wrote:<br>
> Hi,<br>
> <br>
> I'm running BIRD on Arista which allows access to Linux bash. I'm having<br>
> issue with running multihop BFD session on it and I believe it's related to<br>
> port being already binded.<br>
> <br>
> > bash-4.3# netstat -tulpen | grep 4784<br>
> ><br>
> udp6 0 0 :::4784 :::*<br>
> > 0 4269 -<br>
<br>
Hi<br>
<br>
I thing 4269 here is PID, what is the process? netcat should return the<br>
process name, which is not here, but perhaps it is some limited variant<br>
of netcat. Maybe BFD is implemented in control plane on Arista, so it<br>
collides on kernel level?<br></blockquote><div> </div><div>4269 is Inode, netstat for some reason doesn't show PID/process name for ports related to BFD on Arista. This seems to be Arista thing not Bird, so probably that's not a place to investigate this here.</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Also, there should be an error message in the BIRD log related to bind<br>
errors.<br></blockquote><div> </div><div>I haven't seen any error messages in log, perhaps logging level were not set for it. I'll double check it.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
> I couldn't find any configuration option for BFD to change port being used,<br>
> but maybe there is one?<br>
<br>
There is no such option. Perhaps we should add it, as BGP and RIP also<br>
have port option.<br></blockquote><div><br></div><div>That would be super helpful. I could create Pull Request for it, but I've only written in C++ years ago, never actually touched plain C, it can take me some time.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
> Perhaps anyone run into similar issue and have a workaround?<br>
<br>
As a workaround you can recompile BIRD with changed BFD_MULTI_CTL_PORT in<br>
proto/bfd/bfd.h file.<br></blockquote><div><br></div><div>That's what I did. After changing port to arbitrary value, which is not taken on Arista it started to work. So it seems that BFD is failing due to Arista OS.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
-- <br>
Elen sila lumenn' omentielvo<br>
<br>
Ondrej 'Santiago' Zajicek (email: <a href="mailto:santiago@crfreenet.org" target="_blank">santiago@crfreenet.org</a>)<br>
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, <a href="http://wwwkeys.pgp.net" rel="noreferrer" target="_blank">wwwkeys.pgp.net</a>)<br>
"To err is human -- to blame it on a computer is even more so."<br>
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