Date: Mon, 27 Mar 2023 10:00:05 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 270478] Duplicated ARP reply sent from if_bridge member Message-ID: <bug-270478-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D270478 Bug ID: 270478 Summary: Duplicated ARP reply sent from if_bridge member Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: zlei@FreeBSD.org Observed the problem while repeating https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D240106#c28 A script to repeat: ``` #!/bin/sh kldload -nq if_bridge epa=3D$( ifconfig epair create ) epb=3D${epa%a}b j=3D$( jail -ic vnet persist ) ifconfig $epb vnet $j b=3D$( jexec $j ifconfig bridge create ) jexec $j ifconfig $b addm $epb jexec $j ifconfig $epb up jexec $j ifconfig $b inet 192.168.2.2/24 ifconfig $epa inet 192.168.2.1/24 # pre populate arp table for jail jexec $j ping -qc1 192.168.2.1 # print interfaces ifconfig $epa jexec $j ifconfig $epb jexec $j ifconfig $b tmp=3D$( mktemp ) nohup tcpdump -i $epa -Uw $tmp > /dev/null & # clear host arp table, and trigger an arp request via ping arp -da sleep 1 ping -c1 192.168.2.2 # wait a little for tcpdump to write all packets sleep 2 kill $! # show arp table in jail jexec $j arp -na jail -R $j ifconfig $epa destroy tcpdump -ennv -r $tmp 'arp or icmp' rm $tmp ``` The output: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D PING 192.168.2.1 (192.168.2.1): 56 data bytes --- 192.168.2.1 ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev =3D 0.181/0.181/0.181/0.000 ms epair0a: flags=3D8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu = 1500 options=3D8<VLAN_MTU> ether 02:30:35:63:2b:0a inet 192.168.2.1 netmask 0xffffff00 broadcast 192.168.2.255 groups: epair media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>) status: active nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> epair0b: flags=3D8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metri= c 0 mtu 1500 options=3D8<VLAN_MTU> ether 02:30:35:63:2b:0b groups: epair media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>) status: active nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> bridge0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu = 1500 ether ea:80:d1:f2:05:ae inet 192.168.2.2 netmask 0xffffff00 broadcast 192.168.2.255 id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15 maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200 root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0 member: epair0b flags=3D143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 2 priority 128 path cost 2000 groups: bridge nd6 options=3D9<PERFORMNUD,IFDISABLED> 192.168.2.2 (192.168.2.2) deleted PING 192.168.2.2 (192.168.2.2): 56 data bytes 64 bytes from 192.168.2.2: icmp_seq=3D0 ttl=3D64 time=3D0.155 ms --- 192.168.2.2 ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev =3D 0.155/0.155/0.155/0.000 ms ? (192.168.2.2) at ea:80:d1:f2:05:ae on bridge0 permanent [bridge] ? (192.168.2.1) at 02:30:35:63:2b:0a on bridge0 expires in 1198 seconds [bridge] reading from file /tmp/tmp.WKOgI9yi, link-type EN10MB (Ethernet) 01:59:02.272912 02:30:35:63:2b:0a > ff:ff:ff:ff:ff:ff, ethertype ARP (0x080= 6), length 42: Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.2.2 tell 192.168.2.1, length 28 01:59:02.272963 ea:80:d1:f2:05:ae > 02:30:35:63:2b:0a, ethertype ARP (0x080= 6), length 42: Ethernet (len 6), IPv4 (len 4), Reply 192.168.2.2 is-at ea:80:d1:f2:05:ae, length 28 01:59:02.272969 02:30:35:63:2b:0a > ea:80:d1:f2:05:ae, ethertype IPv4 (0x08= 00), length 98: (tos 0x0, ttl 64, id 34746, offset 0, flags [none], proto ICMP (= 1), length 84) 192.168.2.1 > 192.168.2.2: ICMP echo request, id 27667, seq 0, length 64 01:59:02.272971 02:30:35:63:2b:0b > 02:30:35:63:2b:0a, ethertype ARP (0x080= 6), length 42: Ethernet (len 6), IPv4 (len 4), Reply 192.168.2.2 is-at 02:30:35:63:2b:0b, length 28 01:59:02.273013 ea:80:d1:f2:05:ae > 02:30:35:63:2b:0a, ethertype IPv4 (0x08= 00), length 98: (tos 0x0, ttl 64, id 33683, offset 0, flags [none], proto ICMP (= 1), length 84) 192.168.2.2 > 192.168.2.1: ICMP echo reply, id 27667, seq 0, length 64 --=20 You are receiving this mail because: You are the assignee for the bug.=
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