florian.haas at linbit
Sep 16, 2009, 10:02 AM
Post #4 of 5
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Re: [Linux-HA] Problem with gratuitous arps in IPaddr2
[In reply to]
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On 2009-09-16 18:18, Lars Marowsky-Bree wrote:
> On 2009-09-15T15:30:14, Florian Haas <florian.haas [at] linbit> wrote:
>
>> No one seems to have acted on this when it was first posted, but we just
>> discussed this on #linux-ha, and Lars and Dejan were kind enough to
>> offer an explanation:
>
> Why is this cross-posted over 3 lists? One would suffice. Ah well.
Misch posted it on linux-ha, it belongs in linux-ha-dev, and just in
case I'm wrong and it's in fact Pacemaker related, then Andrew is most
likely to read it quickest on pacemaker. That's all. It may be a
heuristic too crude for Your Excellency, but it worked for me. :)
>> This appears to be the case on any system where libnet (on Debian,
>> libnet1-dev) is not available *at compile time*. The obvious workaround,
>> per Lars' and Dejan's suggestion, is to compile resource-agents on a
>> system with libnet installed.
>
> No, the right solution would be to fix the stand-alone send_arp and drop
> the libnet dependency (libnet is not exactly well maintained), and be
> rid of the distinction between the two.
See, that's why I referred to a "workaround", rather than a "solution".
> The send_arp.linux.c code file has different semantics than
> send_arp.libnet.c (I doubt it was ever tested), and can do way more than
> we need, but at the same, can't do a few things we want (like sending
> both ARP types at once, backgrounding, etc).
>
> A simple 7 step plan if someone feels like coding a bit of C:
>
> 1. rm -f send_arp.linux.c
> 2. mv send_arp.libnet.c send_arp.c
> 3. vi send_arp.c
> 4. s/libnet calls/standalone calls/
> 5. fix build
> 6. compile
> 7. ship
>
> Patches welcome ;-)
>
>> Andrew -- assuming you are building packages for RHEL on CentOS, can you
>> make sure you pull libnet into the build environment?
>
> RHEL packages get build on RHEL, not on CentOS.
>
> FWIW, this also affects IPaddr.
Tough luck then. Time to prod the CentOS clustering folks. Fabian?
Cheers,
Florian
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