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Date:      Sat, 15 Apr 2023 17:18:20 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 269908] CARP feature breaks the network
Message-ID:  <bug-269908-7501-OQ6AiPSpUj@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-269908-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-269908-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D269908

--- Comment #11 from Zhenlei Huang <zlei@FreeBSD.org> ---
While testing carp, I see multiple issues. The fix will not come immediatel=
y,
so I'd like to propose you do the following to see if it helps.

1. While in the example of the man doc, host A and B are set different advs=
kew,
I recommend against and set advskew to a same one. So you can change vhid s=
tate
on either host.
2. The preferred way to make a host master or backup is `ifconfig nic0 vhid=
 1
state master` or `ifconfig nic0 vhid 1 state backup`.
3. For aliases, the recommend prefixlen / netmask is 32 / 255.255.255.255
4. If `CISCO ACI endpoint table messed up`, can you try setting only virtua=
l IP
10.10.4.19 on both hosts and see whether it helps or not ? i.e., only `ifco=
nfig
nic0 vhid 1 advskew 20 10.10.4.19/28`.

Apparently the fourth suggestion has drawbacks and you lost the ability to
reach exact host via host IP (not the virtual one).

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