GNU bug report logs - #52520
Multicast is off by default

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mathieu Othacehe <othacehe <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#52520: closed (Multicast is off by default)
Date: Tue, 21 Dec 2021 19:41:02 +0000

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Your message dated Tue, 21 Dec 2021 20:40:29 +0100
with message-id <87ilvhbvbm.fsf <at> gnu.org>
and subject line Re: bug#52520: Multicast is off by default
has caused the debbugs.gnu.org bug report #52520,
regarding Multicast is off by default
to be marked as done.

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52520: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=52520
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From: Mathieu Othacehe <othacehe <at> gnu.org>
To: bug-guix <at> gnu.org
Subject: Multicast is off by default
Date: Wed, 15 Dec 2021 20:36:06 +0100

Hello,

Since the guile-netlink switch the static IP interfaces no longer have
multicast support. This can be confirmed this way:

--8<---------------cut here---------------start------------->8---
4: eno4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether b0:26:28:b7:9d:09 brd ff:ff:ff:ff:ff:ff
5: eno2: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether b0:26:28:b7:9d:0b brd ff:ff:ff:ff:ff:ff
    inet 141.80.181.40/24 brd 141.80.181.255 scope global eno2
       valid_lft forever preferred_lft forever
    inet6 fe80::b226:28ff:feb7:9d0b/64 scope link 
       valid_lft forever preferred_lft forever
--8<---------------cut here---------------end--------------->8---

eno2 that is managed by the static-networking service is lacking
multicast support, while eno4 that is not managed by this service has
multicast support.

This can be adjusted by running:

--8<---------------cut here---------------start------------->8---
ip link set multicast on eno1
--8<---------------cut here---------------end--------------->8---

which immediately fixes Avahi discovery that depends on it.

I think that we could maybe apply the following patch, even though I
didn't test it.

--8<---------------cut here---------------start------------->8---
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 5f93483dda..af3fe015b9 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -2546,6 +2546,7 @@ (define network-set-up/linux
                                                 #$(network-address-ipv6? address))
                                       ;; FIXME: loopback?
                                       (link-set #$(network-address-device address)
+                                                #:multicast-on #t
                                                 #:up #t)))
                                 addresses)
--8<---------------cut here---------------end--------------->8---

Thanks,

Mathieu

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From: Mathieu Othacehe <othacehe <at> gnu.org>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: Julien Lepiller <julien <at> lepiller.eu>, 52520-done <at> debbugs.gnu.org
Subject: Re: bug#52520: Multicast is off by default
Date: Tue, 21 Dec 2021 20:40:29 +0100

Hey,

> BTW, for the purposes of fixing the bug you initially reported, I
> suggest simply adding #:multicast-on #t as you initially proposed.
> We discuss the proper API separately.

Done with: d2f9578a9f1249dfecb0a6b4cd06fd9641fcd1a9.

Thanks,

Mathieu

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