https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248494
Bug ID: 248494
Summary: if_vmx(4) duplicate packets in netmap mode
Product: Base System
Version: 12.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 217042
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217042&action=edit
ICMP DUP packets
scp'in a file stalls due to DUP packets if the interface is if_vmx(4); and it
is opened in NETMAP mode,
Steps to reproduce:
ifconfig vmx0 -vlanhwtso -vlanhwfilter -vlanhwtag -vlanhwcsum -txcsum -rxcsum
-tso4 -tso6 -lro -txcsum6 -rxcsum6
./bridge -i netmap:vmx0 -i netmap:vmx0^
Copy a file which makes use of the vmx0 interface:
scp file root@gw:
Connection will stall.
Interestingly PINGs seem to be OK until you start scp'in the file. Then they
both start getting DUP packets.
Please see attached PCAP file and the pic.
Environment:
root@OPNsense:~ # uname -a
FreeBSD OPNsense.localdomain 12.1-STABLE FreeBSD 12.1-STABLE #2
677f5a8efda(stable/12)-dirty: Tue Aug 4 14:55:58 PDT 2020
root@client_bsd12:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64
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