Hello, On 24.06.23 01:37, RVP wrote:
On Fri, 23 Jun 2023, Brian Buhrow wrote:hello. My understanding is that the arp caching mechanism works regardless of whetheryou use static MAC addresses or dynamically generated ones. [...]If you then run brconfig on the bridge containing the domu, you'll see the MAC address youassigned, or which was assigned dynamically, alive and well.Right, but, cacheing implies a timeout, and is there a timeout for the MAC addresses on Xen IFs? Does an `arp -an' indicate this (I can't test this-- no Xen set up.)
On my Dom0, it looks like there is a timeout for the MAC adresses. The lines below are random but subsequent samples of the "arp -an" command on the Dom0 (192.168.2.50) within a timespan of ~5 minutes. What catched my eye so far:
- there seem to be expirations, that resolve / renew (*1)- there are very long timeouts (23h+) that shortly later seem to be reset to a shorter value (*2)
So I am wondering what the expectation should be. Are the MAC address timeouts supposed to be long-lived (hours...) or are they usually short-lived (seconds)? Does the output below indicate some issue?
Kind regards Matthias ``` vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 23h59m52s S (*2) ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 20s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 2s R ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 2s R ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 1s R ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 8s R ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 13s R vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 23h59m52s S (*2) ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 20s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 2s R ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 2s R ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 1s R ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 8s R ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 13s R vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 23h59m51s S ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 19s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 1s R ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 1s R ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 expired R (*1) ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 7s R ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 12s R vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 16s R ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 29s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 26s R ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 26s R ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 25s R ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 2s D ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 23h59m52s S (*2) vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 10s R ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 23s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 20s R ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 20s R ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 19s R ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 26s R ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 1s D vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 29s R ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 10s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 23h59m52s S (*2) ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 23h59m52s S (*2) ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 23h59m51s S (*2) ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 23h59m58s S (*2) ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 3s R vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 25s R ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 6s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 3s D ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 3s D ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 2s D ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 23h59m54s S (*2) ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 23h59m59s S (*2) vhost2$ doas arp -an ? (192.168.2.254) at e0:28:6d:25:44:6c on re0 23s R ? (192.168.2.191) at 98:ee:cb:f0:3c:b8 on re0 4s R ? (192.168.2.51) at 00:16:3e:00:00:01 on re0 1s D ? (192.168.2.54) at 00:16:3e:00:00:04 on re0 1s D ? (192.168.2.55) at 00:16:3e:00:00:05 on re0 30s R ? (192.168.2.52) at 00:16:3e:00:00:02 on re0 23h59m52s S (*2) ? (192.168.2.53) at 00:16:3e:00:00:03 on re0 23h59m57s S (*2) ```
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