[Bug 792] mtu and NAT wrong solution

[bugzilla-daemon at mindrot.org]

http://bugzilla.mindrot.org/show_bug.cgi?id=792

           Summary: mtu and NAT wrong solution
           Product: Portable OpenSSH
           Version: -current
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P4
         Component: Miscellaneous
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: e_arizon_benito at yahoo.com


It's well known that ssh tunneling have problems crossing an IP masquerading
gateway and solutions point to reduce the interface MTU. But reducing the
interface MTU makes many other applications not to work or to run extremly
slowly. For example Windows clients behind the NAT can't connect to terminal
servers when I reduce it. 
So I think it must be considered a bug or a "requested feature" to let ssh
choose the length of its own data packets.

Due to this problem I can't properly use ssh for tunneling VNC or SMB shares or
even cvs (with -Z option activated).


P.S.:
 All the test I have made are based on ADSL 256/128 and RDSI connections.

 Also notice that all the VPN solutions I have tested provide for some method to
control packet length to avoid problems .( CIPE, POPTOP, OpenVPN) so maybe is
just a matter of "copy and paste" some free available code.



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