[2891] in linux-net channel archive
IP masquerading: what is ``need to frag''?
daemon@ATHENA.MIT.EDU (raju@dontpanic.indiagate.com)
Sun May 12 22:56:02 1996
Date: 12 May 96 15:49:00 +0630
From: raju@dontpanic.indiagate.com
To: linux-net@vger.rutgers.edu
* From: raju@dontpanic.indiagate.com (Raj Mathur)
* Reply-To: raju@dontpanic.indiagate.com
* To: linux-net@vger.rutgers.edu
Hi, Fellow Linuxers,
Recently setup IP masquerading on our newly-acquired Internet link.
The setup is:
My machine --> Router --> Internet
202.41.30.252 202.41.31.247
So the router (202.41.31.247) is masquerading as my machine
(202.41.30.252) for the rest of the 'Net.
Most things (including DNS) go through OK. However, the 2 FTP sites I
tried (sunsite.unc.edu and ftp.cdrom.com) as well as a couple of WWW
sites (lod.com for e.g.) give hung connections. The FTP sites hang
after the ``Port command successful'' for a DIR and the WWW sites hang
after establishing connection.
On doing a tcpdump on the WAN interface on the router I found a
message akin to this when the connection was about to hang:
202.41.31.247 -> sunsite.unc.edu: 202.41.30.252 icmp host
unreachable: need to frag
Does anyone have any ideas?
Router config:
486 DX/2, 8mb, Linux 1.3.89 with firewalling, forwarding,
masquerading, aliasing enabled. (Forwarding required since it actually
_is_ a router for 4 other WAN interfaces).
WAN interfaces: all mtu 1006, SLIP
Eth interface: mtu 1500
Any help appreciated.
-- Raju
--
Raj Mathur Don't Panic! BBS New Delhi India
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