NAT (ipfw/natd) broken in latest -CURRENT
Joe Marcus Clarke
marcus at freebsd.org
Wed Dec 17 15:34:53 UTC 2008
Marko Zec wrote:
> On Wednesday 17 December 2008 10:34:54 Paolo Pisati wrote:
>> Joe Marcus Clarke wrote:
>>> I just upgraded my i386 -CURRENT box from November 14 to today, and
>>> now my SSH-over-PPP VPN tunnel no longer works. I did some packet
>>> captures, and it appears that NAT is no longer working. If I send
>>> a telnet packet from my client side over the PPP tunnel, I see the
>>> SYN go out on the server side network properly translated. The
>>> destination host ACKs correctly, but the ACK never goes back across
>>> the tunnel. It's as if natd is no longer translating the packet on
>>> the inbound path. Besides the upgrade, nothing has changed in my
>>> environment.
>> lately some work has been done on the vimage and routing tree stuff,
>> thus your best bet is to go back
>> some days and try again.
>
> Hi Joe,
>
> could you try building your kernel with options VIMAGE_GLOBALS and tell
> us whether this makes any difference - turning on VIMAGE_GLOBALS should
> revert certain aspects of virtualization changes that recently got
> merged into the tree.
Thanks for the suggestion, but the results are the same. I turned on
-verbose on natd, and I see the ACK packet come back from the
destination, and natd is translating it correctly. However, I never see
the ACK on the remote end of the tunnel. It looks like a routing
problem at this point. It's as if the kernel doesn't know on what
interface to encapsulate the reply packet.
Joe
>
> Cheers,
>
> Marko
>
>
--
Joe Marcus Clarke
FreeBSD GNOME Team :: gnome at FreeBSD.org
FreeNode / #freebsd-gnome
http://www.FreeBSD.org/gnome
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