Thank you for getting back to me...I have a slightly better understanding of
ifconfig now... 8-)
The Netcomm is a "Smart i-Share56" running uClinux:
-----------------------------------------------
Smart I-Share 56 Version 1.0.6.8 -- Thu Jun 7 14:19:20 EST 2001
uClinux version 2.0.38.0 ([EMAIL PROTECTED]) (gcc version
egcs-2.91.66 19990314 (egcs-1.1.2 release)) #363 Thu Jun 7 14:18:50 EST 2001
-----------------------------------------------
I tried issuing the command you suggested without seeing any change, but did
see one thing which has to be related...as you'll see, on eth0 RX packets
are being dropped. This number increases each time I try to send something
largish...also "collisions"?
-----------------------------------------------
eth0 Link encap:Ethernet HWaddr 00:60:64:02:32:12
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1480 Metric:1
RX packets:425282 errors:8 dropped:3344 overruns:0 frame:779
TX packets:386374 errors:0 dropped:0 overruns:0 carrier:0
collisions:480
Interrupt:3 Base address:0x300
lo Link encap:Local Loopback
inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0.0.0
UP BROADCAST LOOPBACK RUNNING MTU:3584 Metric:1
RX packets:24 errors:0 dropped:0 overruns:0 frame:0
TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
ppp0 Link encap:Point-to-Point Protocol
inet addr:203.14.156.30 P-t-P:203.14.156.2 Mask:255.255.255.0
UP POINTOPOINT RUNNING MTU:1500 Metric:1
RX packets:347664 errors:0 dropped:0 overruns:0 frame:0
TX packets:375078 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
Memory:333036-333c02
sl0 Link encap:Serial Line IP
inet addr:10.255.255.253 P-t-P:10.255.255.254 Mask:255.0.0.0
UP POINTOPOINT RUNNING MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:161 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
-----------------------------------------------
----- Original Message -----
From: Derek Jennings <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, February 02, 2003 1:30 AM
Subject: Re: [newbie] Postfix and ICMP
> On Saturday 01 Feb 2003 12:53 pm, Ross Slade wrote:
> > Some background...
> >
> > I use a Netcomm modem/router/hub/firewall which runs embedded Linux for
my
> > connection to the internet...on my LAN I have one Mandrake 8.1 box and
two
> > WinME boxes. The Mandrake box is a simple server running Apache, Postfix
> > and Squid mainly.
> >
> > The Netcomm uses port forwarding on ports 80 & 25 (ONLY) to the Mandrake
> > box.
> >
> > As you may have guessed, I have a problem... 8-)
> >
> > The problem is this:
> >
> > I receive mail and everything else just fine, and I can send small
emails
> > (under about 10-15k) just fine, but cannot send anything larger. If I
try
> > it will start to send then slow gradually until it comes to a grinding
halt
> > and eventually times out.
> >
> > As near as I can determine it's related to this:
> >
http://home.uninet.ee/~ragnar/manuals/postfix-19990906-pl02/faq.html#timeou
> >t s
> >
> > My knowledge is very limited, but obviously (?) I need to forward ICMP
> > messages to the Mandrake box.
> >
> > My questions: How? What other ports should be forwarded?
> >
> > Thanks...
> >
> > -Ross
> >
>
> This is an interesting problem. The effect you are suffering from is
> described here http://alive.znep.com/~marcs/mtu/
>
> The ICMP packets I think use the same port number as the data packets, but
> with a different header, so it is not just a matter of forwarding a
different
> port number.
>
> I wonder are you using pppoe (ppp over Ethernet) as your protocol to your
> ISP?
>
> If so then the pppoe overhead could be your problem. The maximum MTU size
used
> with pppoe should be 1480 bytes, but your Ethernet port will have a
default
> MTU size of 1500 bytes.
>
> The simplest solution could be to just issue the command
> ifconfig eth0 mtu 1480
>
> HTH
>
> derek
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