[ClusterLabs] IPaddr2, interval between unsolicited ARP packets
飯田 雄介
iidayuus at intellilink.co.jp
Wed Oct 5 04:19:14 EDT 2016
Hi, Hamaguchi-san
send_arp exists in two versions depending on the environment.
https://github.com/ClusterLabs/resource-agents/blob/master/tools/send_arp.libnet.c
https://github.com/ClusterLabs/resource-agents/blob/master/tools/send_arp.linux.c
Those that contain in your environment, it seems that it is send_arp.linux.c.
send_arp.linux.c has been made to also work with the same options as the send_arp.libnet.c.
However, -i and -p In send_arp.linux.c is not used.
send_arp.linux.c sends arp every second because it is driven by the alarm(1).
https://github.com/ClusterLabs/resource-agents/blob/master/tools/send_arp.linux.c#L384
This interval cannot be changed because they are hard-coded.
Regards, Yusuke
> -----Original Message-----
> From: Shinjiro Hamaguchi [mailto:hamaguchi at agile.ne.jp]
> Sent: Wednesday, October 05, 2016 1:57 PM
> To: users at clusterlabs.org
> Subject: Re: [ClusterLabs] IPaddr2, interval between unsolicited ARP packets
>
> Matsushima-san
>
>
> Thank you very much for your reply.
> And sorry for late reply.
>
>
> >Do you get same result by executing the command manually with different
> parameters like this?
> I tried following command but same result (1sec interval)
>
> [command used to send unsolicited arp]
> /usr/libexec/heartbeat/send_arp -i 1500 -r 8 eth0 192.168.12.215 auto not_used
> not_used
>
> [result of tcudump]
> 04:31:50.475928 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
> 04:31:51.476053 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
> 04:31:52.476146 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
> 04:31:53.476246 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
> 04:31:54.476287 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
> 04:31:55.476406 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
> 04:31:56.476448 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
> 04:31:57.476572 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> 192.168.12.215, length 28
>
> >Please also make sure the PID file has been created properly.
> When I checked manually with send_arp command, I didn't use send_arp command
> with "-p" option.
>
> Even when I did fail-over of IPaddr2resource (not manually execute send_arp
> command), I couldn't see pid file generated at /var/run/resource-agents/.
> I used following command to see if pid file generated.
>
> watch -n0.1 "ls -la /var/run/resource-agents/"
>
>
> Thank you in advance.
>
>
> On Wed, Oct 5, 2016 at 12:20 PM, Digimer <lists at alteeve.ca> wrote:
>
>
>
>
>
> -------- Forwarded Message --------
> Subject: Re: [ClusterLabs] IPaddr2, interval between unsolicited ARP
> packets
> Date: Tue, 4 Oct 2016 11:18:37 +0900
> From: Takehiro Matsushima <takehiro.dreamizm at gmail.com>
> Reply-To: Cluster Labs - All topics related to open-source clustering
> welcomed <users at clusterlabs.org>
> To: Cluster Labs - All topics related to open-source clustering welcomed
> <users at clusterlabs.org>
>
> Hello Hamaguchi-san,
>
> Do you get same result by executing the command manually with
> different parameters like this?
> #/usr/libexec/heartbeat/send_arp -i 1500 -r 8 -p
> /var/run/resource-agents/send_arp-192.168.12.215 eth0
> 192.168.12.215
> auto not_used not_used
>
> Please also make sure the PID file has been created properly.
>
> Thank you,
>
> Takehiro MATSUSHIMA
>
> 2016-10-03 14:45 GMT+09:00 Shinjiro Hamaguchi
> <hamaguchi at agile.ne.jp>:
> > Hello everyone!!
> >
> >
> > I'm using IPaddr2 for VIP.
> >
> > In the IPaddr2 document, it say interval between unsolicited ARP
> packets is
> > default 200msec and can change it using option "-i", but when i check
> with
> > tcpdump, it looks like sending arp every 1000msec fixed.
> >
> > Does someone have any idea ?
> >
> > Thank you in advance.
> >
> >
> > [environment]
> > kvm, centOS 6.8
> > pacemaker-1.1.14-8.el6_8.1.x86_64
> > cman-3.0.12.1-78.el6.x86_64
> > resource-agents-3.9.5-34.el6_8.2.x86_64
> >
> >
> > [command used to send unsolicited arp]
> > NOTE: i got this command from /var/log/cluster/corosync.log
> > #/usr/libexec/heartbeat/send_arp -i 200 -r 5 -p
> > /var/run/resource-agents/send_arp-192.168.12.215 eth0
> 192.168.12.215 auto
> > not_used not_used
> >
> > [result of tcudump]
> >
> > #tcpdump arp
> >
> > tcpdump: verbose output suppressed, use -v or -vv for full protocol
> decode
> >
> > listening on eth0, link-type EN10MB (Ethernet), capture size 65535
> bytes
> >
> > 05:28:17.267296 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> > 192.168.12.215, length 28
> >
> > 05:28:18.267519 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> > 192.168.12.215, length 28
> >
> > 05:28:19.267638 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> > 192.168.12.215, length 28
> >
> > 05:28:20.267715 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> > 192.168.12.215, length 28
> >
> > 05:28:21.267801 ARP, Request who-has 192.168.12.215 (Broadcast) tell
> > 192.168.12.215, length 28
> >
> >
> >
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