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From: Marcin Gryszkalis <mg@fork.pl>
To: <freebsd-net@freebsd.org>
Subject: em, pf - losing tcp traffic
Date: Sat, 01 Sep 2018 15:03:53 +0200
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Hi
I have pretty old gateway that started to behave strange.

Few times a day the lan interface stops receiving tcp and icmp traffic.
With tcpdump I can see arp, dns (udp), rtp over udp, netbios=20
broadcasts (169.254/16), sip packets - but no tcp and also icmp ping=20
replies=20
stop coming.

The only way to fix it is ifconfig down + ifconfig up.

The system is 11.2(amd64).
Card:
em3@pci0:7:0:0: class=3D0x020000 card=3D0x002e8086 chip=3D0x100e8086 rev=3D0x=
02=20
hdr=3D0x00
    vendor     =3D 'Intel Corporation'
    device     =3D '82540EM Gigabit Ethernet Controller'

lan0: flags=3D8947<UP,BROADCAST,DEBUG,RUNNING,PROMISC,SIMPLEX,MULTICAST>=20
metric 0 mtu 1500
       =20
options=3D209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC>
        ether 00:07:e9:11:24:61
        hwaddr 00:07:e9:11:24:61
        inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255=20
        nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active

pf limits are not reached, pf reload or restart doesn't help.

The switch is dummy L2 so it shouldn't be able to recognize udp from tcp.=20

I don't know what else could I check or try...=20
Please advise :)

best regards
--=20
Marcin Gryszkalis, PGP 0xA5DBEEC7 http://fork.pl/gpg.txt