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Mon, 8 Dec 2025 10:33:48 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 5B8AXm35085377 for net@FreeBSD.org; Mon, 8 Dec 2025 10:33:48 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 291420] [epair] Bad UDP packet checksum with epair(4) and txcsum enabled Date: Mon, 08 Dec 2025 10:33:47 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 14.3-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: dmitryluhtionov@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: net@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Networking and TCP/IP with FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-net List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-net@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D291420 --- Comment #6 from Dmitry Lukhtionov --- (In reply to Michael Tuexen from comment #4) On host machine ``` root@DL360_Gen9_m19:/home/mitya # sysctl sysctl dev.bge.1.forced_udpcsum=3D1 dev.bge.1.forced_udpcsum: 0 -> 1 root@DL360_Gen9_m19:/home/mitya # ifconfig bge1 down root@DL360_Gen9_m19:/home/mitya # ifconfig bge1 up root@DL360_Gen9_m19:/home/mitya # ifconfig bge1 bge1: flags=3D1008943 metric 0 mtu 1500 =20=20=20=20=20=20=20 options=3Dc009b ether c4:34:6b:b8:e4:39 inet 193.34.20.5 netmask 0xfffffff0 broadcast 193.34.20.15 media: Ethernet autoselect (1000baseT ) status: active nd6 options=3D29 root@DL360_Gen9_m19:/home/mitya # ifconfig epair1a epair1a: flags=3D1008943 metric 0 mtu 1500 options=3D20000b ether 02:ef:5d:1e:0d:0a groups: epair media: Ethernet 10Gbase-T (10Gbase-T ) status: active nd6 options=3D9 ``` Inside jail ``` root@mail:/ # ifconfig epair1b epair1b: flags=3D1008843 m= etric 0 mtu 1500 options=3D20000b ether 02:ef:5d:1e:0d:0b inet 193.34.20.8 netmask 0xfffffff0 broadcast 193.34.20.15 groups: epair media: Ethernet 10Gbase-T (10Gbase-T ) status: active nd6 options=3D29 root@mail:/ # drill i.ua @193.34.20.4 ;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 12682 ;; flags: qr rd ra ; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0=20 ;; QUESTION SECTION: ;; i.ua. IN A ;; ANSWER SECTION: i.ua. 21 IN A 104.18.2.81 i.ua. 21 IN A 104.18.3.81 ;; AUTHORITY SECTION: ;; ADDITIONAL SECTION: ;; Query time: 0 msec ;; SERVER: 193.34.20.4 ;; WHEN: Mon Dec 8 12:32:25 2025 ;; MSG SIZE rcvd: 54 ``` BUT ``` root@mail:/ # ping 193.34.20.5 PING 193.34.20.5 (193.34.20.5): 56 data bytes ^C --- 193.34.20.5 ping statistics --- 4 packets transmitted, 0 packets received, 100.0% packet loss root@mail:/ # ping 193.34.20.4 PING 193.34.20.4 (193.34.20.4): 56 data bytes 64 bytes from 193.34.20.4: icmp_seq=3D0 ttl=3D64 time=3D0.482 ms 64 bytes from 193.34.20.4: icmp_seq=3D1 ttl=3D64 time=3D0.283 ms 64 bytes from 193.34.20.4: icmp_seq=3D2 ttl=3D64 time=3D0.479 ms 64 bytes from 193.34.20.4: icmp_seq=3D3 ttl=3D64 time=3D0.323 ms ^C --- 193.34.20.4 ping statistics --- 4 packets transmitted, 4 packets received, 0.0% packet loss round-trip min/avg/max/stddev =3D 0.283/0.392/0.482/0.090 ms ``` --=20 You are receiving this mail because: You are the assignee for the bug.=