Re: FBSD 15 :: if_bridge help needed

On Wed, Oct 8, 2025 at 3:59 AM Lexi Winter <ivy@freebsd.org> wrote:
>
> Paul Procacci wrote in <CAFbbPuhiLsWcjbVD9F_RH+Q+5b2BZcAnLK2h3AqiJjkcOkxaMQ@mail.gmail.com>:
> > From hosts' perspective:
> > -----------------------------------------------------------
> > root@host:~ # tcpdump -ni epair0a
> > tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
> > listening on epair0a, link-type EN10MB (Ethernet), snapshot length 262144 bytes
>
> > From Jail 1's perspective:
> > -----------------------------------------------------------
> > root@Jail1:/ # tcpdump -ni epair0b.60
> > tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
> > listening on epair0b.60, link-type EN10MB (Ethernet), snapshot length
> > 262144 bytes
> > 07:52:03.722196 ARP, Request who-has 192.168.60.2 tell 192.168.60.1, length 28
> > 07:52:04.785635 ARP, Request who-has 192.168.60.2 tell 192.168.60.1, length 28
>
> this seems like the packets are not making it out of the vlan(4)
> interface for some reason.  could you please re-run this with
> tcpdump -ve (it doesn't show .1q tags otherwise) and include
> the output for both epair0b.60 and epair0b in the jail?
>
> also for my reference, please include the ifconfig output for
> epair0b.60, epair0b and epair0a (i think you already showed this,
> it's just easier to have it all together, if you don't mind).

Sure.  This isn't a problem and I think you're onto something:

root@fw:/ # tcpdump -nvi epair0b -e
tcpdump: listening on epair0b, link-type EN10MB (Ethernet), snapshot
length 262144 bytes
^C
root@Jail 1:/ # tcpdump -nvi epair0b.60 -e
tcpdump: listening on epair0b.60, link-type EN10MB (Ethernet),
snapshot length 262144 bytes
08:00:29.095183 58:9c:fc:10:bb:b7 > ff:ff:ff:ff:ff:ff, ethertype ARP
(0x0806), length 42: Ethernet (len 6), IPv4 (len 4), Request who-has
192.168.60.2 tell 192.168.60.1, length 28
08:00:30.158598 58:9c:fc:10:bb:b7 > ff:ff:ff:ff:ff:ff, ethertype ARP
(0x0806), length 42: Ethernet (len 6), IPv4 (len 4), Request who-has
192.168.60.2 tell 192.168.60.1, length 28


.... and the output of the interfaces ....
root@Host:~ # ifconfig epair0a
epair0a: flags=1008943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_UP>
metric 0 mtu 1500
        options=60000b<RXCSUM,TXCSUM,VLAN_MTU,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 58:9c:fc:10:8b:0f
        groups: epair
        media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>


root@Jail 1:/ # ifconfig epair0b; ifconfig epair0b.60
epair0b: flags=1008942<BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_UP>
metric 0 mtu 1500
        options=60000b<RXCSUM,TXCSUM,VLAN_MTU,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 58:9c:fc:10:bb:b7
        groups: epair
        media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
epair0b.60: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP>
metric 0 mtu 1500
        options=0
        ether 58:9c:fc:10:bb:b7
        inet 192.168.60.1 netmask 0xffffff00 broadcast 192.168.60.255
        groups: vlan
        vlan: 60 vlanproto: 802.1q vlanpcp: 0 parent interface: epair0b
        media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

Let me know if you want anything more.

~Paul
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