https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255432
Bug ID: 255432
Summary: pf fragment reassembly leads to invalid IP checksum
since 13.0-RELEASE
Product: Base System
Version: 13.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: topi...@gmx.net
Scenario: I have 2 lagg interfaces: one with mtu 1500 another with mtu 9000.
Both have several VLANs.
Fragmented UDP packets are received by VLAN of first interface, reassembled by
pf ("scrub in all fragment reassemble"), and then sent out as jumbo frame by
VLAN of second interface.
All networks cards are mellanox ("mce"). All H/W offload features but LRO are
enabled.
Before 13.0 everything worked fine. Since 13.0, the resulting jumbo frame is
sent out with invalid IP checksum and thus discarded by receiver.
Disabling TXCSUM on outgoing VLAN interface doesn't change anything.
I tried to disable VLAN_HWCSUM on outgoing LAGG interface, but this seems to be
impossible without reboot - ifconfig still shows this feature as enabled. As
this is a production system, rebooting for further tests is not an option.
But: if I decrease mtu of outgoing VLAN interface to 1500, the packet gets
fragmented again and IP checksums are correct.
I know that there are (cheap) network cards with broken/limited H/W offload
support and thus you should disable all these features. But AFAIK mellanox
cards are not affected by this and actually they worked until 13.0
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
freebsd-bugs@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-bugs
To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
