--- Comment #9 from Sydney Meyer <> ---
In its most basic form, without doing nat, without have pf loaded, the problem
comes up e.g. in the following setup:

(PC1) on xn0 <--> on xn0 (FreeBSD DomU Router) on xn1 <--> (PC2) on xn0.

- Install FreeBSD on DomU Router with 2 paravirtual network interfaces in
different subnets
- sysctl net.inet.ip.forwarding=1 on Router
- Setup PC1/2 with FreeBSD/Linux/Windows with the FreeBSD Router as their
- On PC1: dd if=/dev/zero bs=1M | nc -l 5001
- On PC2: nc 5001 | dd of=/dev/zero bs=1M
- Or any other TCP-Connection, e.g. ssh, for that matter.

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