Hello Ondrej,
Many thanks for the advise.
We have upgraded BIRD to the latest 1.6.8 version.
In this version seems the crash issue is resolved but the second issue with
- iBGP between RS-RS over IPv6 still exists. This BGP session is not able to
establish yet.
In my LAB I have successfully replicated the issue. Both Route Servers are on
BIRD with latest version 1.6.8. They have the following IPv6 addresses
configured:
RS1 IPv6 - 2001:67c:29f0::A:1:234:4
RS2 IPv6 - 2001:67c:29f0::A:1:234:5
Here is the config fo each RS
RS1 output:
# birdc6 show proto
BIRD 1.6.8 ready.
name proto table state since info
device1 Device master up 2021-07-20 10:50:21
P1234 Pipe master up 2021-07-20 10:50:21 => T1234
R1234x5 BGP T1234 start 2021-07-20 10:58:33 Connect
direct1 Direct master down 2021-07-20 11:09:51
kernel1 Kernel master down 2021-07-20 11:09:51
# cat AS1234
table T1234
protocol pipe P1234 from iBGP_PIPES {
description "RS";
peer table T1234;
export all;
}
protocol bgp R1234x5 {
description "iBGP_RS2";
source address 2001:67c:29f0::A:1:234:4;
neighbor 2001:67c:29f0::A:1:234:5 as 1234;
local as myas;
prefer older on;
missing lladdr ignore;
import none;
export none;
passive off;
table T1234;
# add paths on;
# direct;
}
===============================================================================
RS2 output:
# birdc6 show proto
BIRD 1.6.8 ready.
name proto table state since info
device1 Device master up 2021-07-20 10:52:23
P1234 Pipe master up 2021-07-20 10:52:23 => T1234
R1234x4 BGP T1234 start 2021-07-20 10:58:46 Connect
direct1 Direct master down 2021-07-20 11:09:21
kernel1 Kernel master down 2021-07-20 11:09:21
# cat AS1234
table T1234
protocol pipe P1234 from iBGP_PIPES {
description "RS";
peer table T1234;
export all;
}
protocol bgp R1234x4 {
description "iBGP_RS1";
source address 2001:67c:29f0::A:1:234:5;
neighbor 2001:67c:29f0::A:1:234:4 as 1234;
local as myas;
prefer older on;
missing lladdr ignore;
import none;
export none;
passive off;
table T1234;
# add paths on;
# direct;
}
Seems the issue happens when remote peer is also BIRD. When remote peer is
router ( Cisco, Juniper, Quagga etc... ) the session is successfully
established.
On IPv4 iBGP between both RS works fine. So the issue related only with IPv6
stack.
I appreciate any kind of help.
Best~
Javor Kliachev
Senior Engineer IP Services
office: +359 2 974 33 11
mobile: +359 885 98 84 95
[ http://www.neterra.net/ | www.neterra.net ] [
https://bg.linkedin.com/pub/javor-kliachev/11/b46/843 |
]
From: "Ondrej Zajicek" <[email protected]>
To: "Javor Kliachev" <[email protected]>
Cc: "bird-users" <[email protected]>, "inmt-ip" <[email protected]>
Sent: Friday, 9 July, 2021 16:33:20
Subject: Re: BIRD - iBGP between RS over IPv6 lead to crash (segfault)
On Fri, Jul 09, 2021 at 11:43:53AM +0300, Javor Kliachev wrote:
Hello,
We're using BIRD 1.6.4 as Route Server.
Recently we have decided to establish an internal BGP session between both RS
over IPv6
But when we added our config in BIRD then it has crashed immediately with the
following error:
[35878512.553496] bird6[2545]: segfault at 0 ip 000055f60242c331 sp
00007ffd43689460 error 4 in bird6[55f60240a000+86000]
Another more strange:
Initially before the crash we have added the following config below and RS was
stable but session was not able to establish.
We have made a capture of the traffic during the attempt of session
establishment and seems TCP handshake works but then not procced futher.
...
Could someone BIRD developer to suggest some solution for fixing this issue?
We highly appreciate any kind of support.
Hello
Well, first upgrade and try latest legacy version (1.6.8). Version 1.6.4
is too old and not worth to us to check whether it was already fixed or
not.
--
Elen sila lumenn' omentielvo
Ondrej 'Santiago' Zajicek (email: [email protected])
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
