Date: Fri, 14 Nov 2025 02:41:41 +0000 From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 262292] Seemingly not possible for IPv6 to function over tap devices on if_bridge Message-ID: <bug-262292-27103-xEd5pypCrv@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-262292-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-262292-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262292 --- Comment #11 from Brad Ackerman <brad@facefault.org> --- (In reply to ivy from comment #10) So the problem is that I'm not quite figuring out how to share a /64 with the jails. I've got a /64 from which I'd like to assign both jails and the host; if I remove the address from the host's external interface NDP on the bridge starts working — but telling ifconfig that the prefixlen is 128 on all the global-scope addresses (and then setting up a far gateway on the jail) doesn't seem to make a difference. jails: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500 options=0 ether 58:9c:fc:10:80:39 inet 172.21.188.1 netmask 0xfffffc00 broadcast 172.21.191.255 inet6 fe80::5a9c:fcff:fe10:8039%jails prefixlen 64 scopeid 0x4 inet6 2604:2dc0:200:2116::ff:ffff prefixlen 64 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: e0a_powerdns flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 8 priority 128 path cost 2000 groups: bridge nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> e0a_powerdns: flags=1008943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500 description: vnet0 host interface for Bastille jail powerdns options=8<VLAN_MTU> ether 02:57:e9:cd:fc:0a groups: epair media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>) status: active nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> Inside jail, the other side of the epair: vnet0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500 options=8<VLAN_MTU> ether 02:57:e9:cd:fc:0b inet6 2604:2dc0:200:2116::4 prefixlen 64 inet6 fe80::57:e9ff:fecd:fc0b%vnet0 prefixlen 64 scopeid 0x9 groups: epair media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>) status: active nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> $ sudo tcpdump -nvvve -i jails tcpdump: listening on jails, link-type EN10MB (Ethernet), snapshot length 262144 bytes 02:13:07.789039 02:cb:b3:d7:b8:0b > 33:33:ff:ff:ff:ff, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payload length: 32) 2604:2dc0:200:2116::4 > ff02::1:ffff:ffff: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2604:2d c0:200:2116::ff:ffff source link-address option (1), length 8 (1): 02:cb:b3:d7:b8:0b 0x0000: 02cb b3d7 b80b 02:13:08.789166 02:cb:b3:d7:b8:0b > 33:33:ff:ff:ff:ff, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payload length: 32) 2604:2dc0:200:2116::4 > ff02::1:ffff:ffff: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2604:2d c0:200:2116::ff:ffff source link-address option (1), length 8 (1): 02:cb:b3:d7:b8:0b 0x0000: 02cb b3d7 b80b 02:13:09.816291 02:cb:b3:d7:b8:0b > 33:33:ff:ff:ff:ff, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payl oad length: 32) 2604:2dc0:200:2116::4 > ff02::1:ffff:ffff: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2604:2dc0:200:2116::ff:ffff source link-address option (1), length 8 (1): 02:cb:b3:d7:b8:0b 0x0000: 02cb b3d7 b80b 02:13:15.163167 02:cb:b3:d7:b8:0b > 33:33:ff:ff:ff:ff, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payload length: 32) 2604:2dc0:200:2116::4 > ff02::1:ffff:ffff: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2604:2d c0:200:2116::ff:ffff source link-address option (1), length 8 (1): 02:cb:b3:d7:b8:0b 0x0000: 02cb b3d7 b80b -- You are receiving this mail because: You are the assignee for the bug.
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