Does FreeBSD do proactive ARP refresh?,Re: Does FreeBSD do proactive ARP refresh?

[sthaug at nethelp.no]

> Can you show your config and stats after the test?
> # sysctl net.link.ether
> # netstat -sp arp
> # netstat -sp ip
> # netstat -sp udp

OK, below is the output from these commands, run on the iperf3 sender,
from before and after one test run. I ran the test for 370 seconds,
and had 3 periods of packet loss, spaced 120 seconds apart.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no
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# Before
sthaug at pondus% sysctl net.link.ether
net.link.ether.inet.allow_multicast: 0
net.link.ether.inet.log_arp_permanent_modify: 1
net.link.ether.inet.log_arp_movements: 1
net.link.ether.inet.log_arp_wrong_iface: 1
net.link.ether.inet.garp_rexmit_count: 0
net.link.ether.inet.max_log_per_second: 1
net.link.ether.inet.maxhold: 1
net.link.ether.inet.wait: 20
net.link.ether.inet.proxyall: 0
net.link.ether.inet.maxtries: 5
net.link.ether.inet.max_age: 120
net.link.ether.ipfw: 0
sthaug at pondus% netstat -sp arp
arp:
        67 ARP requests sent
        812 ARP replies sent
        54274 ARP requests received
        63 ARP replies received
        54337 ARP packets received
        339 total packets dropped due to no ARP entry
        63 ARP entrys timed out
        0 Duplicate IPs seen
sthaug at pondus% netstat -sp ip
ip:
        52434 total packets received
        0 bad header checksums
        0 with size smaller than minimum
        0 with data size < data length
        0 with ip length > max ip packet size
        0 with header length < data size
        0 with data length < header length
        0 with bad options
        0 with incorrect version number
        0 fragments received
        0 fragments dropped (dup or out of space)
        0 fragments dropped after timeout
        0 packets reassembled ok
        51339 packets for this host
        0 packets for unknown/unsupported protocol
        33 packets forwarded (18 packets fast forwarded)
        1 packet not forwardable
        0 packets received for unknown multicast group
        0 redirects sent
        109204414 packets sent from this host
        0 packets sent with fabricated ip header
        0 output packets dropped due to no bufs, etc.
        23551 output packets discarded due to no route
        0 output datagrams fragmented
        0 fragments created
        0 datagrams that can't be fragmented
        0 tunneling packets that can't find gif
        0 datagrams with bad address in header
sthaug at pondus% netstat -sp udp
udp:
        2750 datagrams received
        0 with incomplete header
        0 with bad data length field
        0 with bad checksum
        440 with no checksum
        2138 dropped due to no socket
        0 broadcast/multicast datagrams undelivered
        0 dropped due to full socket buffers
        0 not for hashed pcb
        612 delivered
        109160018 datagrams output
        0 times multicast source filter matched
# After
sthaug at pondus% sysctl net.link.ether
net.link.ether.inet.allow_multicast: 0
net.link.ether.inet.log_arp_permanent_modify: 1
net.link.ether.inet.log_arp_movements: 1
net.link.ether.inet.log_arp_wrong_iface: 1
net.link.ether.inet.garp_rexmit_count: 0
net.link.ether.inet.max_log_per_second: 1
net.link.ether.inet.maxhold: 1
net.link.ether.inet.wait: 20
net.link.ether.inet.proxyall: 0
net.link.ether.inet.maxtries: 5
net.link.ether.inet.max_age: 120
net.link.ether.ipfw: 0
sthaug at pondus% netstat -sp arp
arp:
        70 ARP requests sent
        813 ARP replies sent
        54297 ARP requests received
        66 ARP replies received
        54363 ARP packets received
        351 total packets dropped due to no ARP entry
        66 ARP entrys timed out
        0 Duplicate IPs seen
sthaug at pondus% netstat -sp ip
ip:
        52527 total packets received
        0 bad header checksums
        0 with size smaller than minimum
        0 with data size < data length
        0 with ip length > max ip packet size
        0 with header length < data size
        0 with data length < header length
        0 with bad options
        0 with incorrect version number
        0 fragments received
        0 fragments dropped (dup or out of space)
        0 fragments dropped after timeout
        0 packets reassembled ok
        51432 packets for this host
        0 packets for unknown/unsupported protocol
        33 packets forwarded (18 packets fast forwarded)
        1 packet not forwardable
        0 packets received for unknown multicast group
        0 redirects sent
        111059559 packets sent from this host
        0 packets sent with fabricated ip header
        0 output packets dropped due to no bufs, etc.
        23551 output packets discarded due to no route
        0 output datagrams fragmented
        0 fragments created
        0 datagrams that can't be fragmented
        0 tunneling packets that can't find gif
        0 datagrams with bad address in header
sthaug at pondus% netstat -sp udp
udp:
        2751 datagrams received
        0 with incomplete header
        0 with bad data length field
        0 with bad checksum
        440 with no checksum
        2138 dropped due to no socket
        0 broadcast/multicast datagrams undelivered
        0 dropped due to full socket buffers
        0 not for hashed pcb
        613 delivered
        111015060 datagrams output
        0 times multicast source filter matched