[Bug 188261] [xen] FreeBSD DomU PVHVM guests cannot 'route' traffic for other Xen PV guests on same Dom0 Host.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188261

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

(PC1) 10.0.1.2/24 on xn0 <--> 10.0.1.1/24 on xn0 (FreeBSD DomU Router)
10.0.2.1/24 on xn1 <--> (PC2) 10.0.2.2/24 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
Gateway.
- On PC1: dd if=/dev/zero bs=1M | nc -l 5001
- On PC2: nc 1.2.3.4 5001 | dd of=/dev/zero bs=1M
- Or any other TCP-Connection, e.g. ssh, for that matter.

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