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if_epair(4): use ether_gen_addr(9) for stable MAC address Before this change epair interfaces get a random MAC. This does not help dhcp/dyndns when an epair gets destroyed/recreated after restart of a jail. With this change: $ sysctl net.link.epair.ether_gen_addr=0 $ ifconfig epair8 create > /dev/null; ifconfig epair8a | grep ether; ifconfig epair8b | grep ether; ifconfig epair8a destroy ether 02:cb:78:56:e4:0a ether 02:cb:78:56:e4:0b $ ifconfig epair8 create > /dev/null; ifconfig epair8a | grep ether; ifconfig epair8b | grep ether; ifconfig epair8a destroy ether 02:8b:9b:6a:8f:0a ether 02:8b:9b:6a:8f:0b $ sysctl net.link.epair.ether_gen_addr=1 $ ifconfig epair8 create > /dev/null; ifconfig epair8a | grep ether; ifconfig epair8b | grep ether; ifconfig epair8a destroy ether 58:9c:fc:10:2b:b4 ether 58:9c:fc:00:39:10 $ ifconfig epair8 create > /dev/null; ifconfig epair8a | grep ether; ifconfig epair8b | grep ether; ifconfig epair8a destroy ether 58:9c:fc:10:2b:b4 ether 58:9c:fc:00:39:10 A follow up commit will change the default to 1 in main. Approved by: bz,ivy,kp Relnotes: yes Differential Revision: https://reviews.freebsd.org/D51157 78537728: Document tunable net.link.epair.ether_gen_addr Approved by: hrs Fixes: 590493c1419092e98f7ad1dcadb886973502341e ("if_epair(4): use ether_gen_addr(9) for stable MAC address") Differential Revision: https://reviews.freebsd.org/D51861 (cherry picked from commit 590493c1419092e98f7ad1dcadb886973502341e) (cherry picked from commit 78537728efc5387558c97ba2730ce746d6259013) |
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