SLIP MTU problem

SLIP MTU problem

Post by John W. Templ » Thu, 11 Jan 1996 04:00:00

I'm having a SLIP MTU problem on OS5.  I've specified a "-m 1500" on
the slattach command, but ifconfig shows me:


I even tried editing /usr/include/sys/netinet/slip.h and changed
#define MAXSLIP 296 to 1500 and rebuilt the kernel, to no avail.
Is this a bug or am I missing something?
John W. Temples, III       ||       Providing the first public access Internet
Gulfnet Kuwait             ||            site in the Arabian Gulf region


1. How to modify MTU value under DIP slip mode ?

I have tried to add the command "get $mtu 1500" in my diphost
configuration file. Then, use "dip /etc/diphosts" to connect my Internet
Service Provider. After connection, I used "ifconfig" to check the MTU of
my slip/ppp line. The value is still 296 (default one). The MTU of my LAN
segent (el0) is 1500. Afterwards, I used "dip -m 1500 /etc/diphosts" to
call my Internet Service Provider for testing again. But I still got the
same MTU value. It is still 296.

My provider had set the MTU value to 1500 at the ppp port of the ppp server.
So my linux cannot receive any ip packets which size is bigger than 296.
When I want to download one file via ftp (which file size is bigger 296), my
linux will freeze and get nothing.

Anyone can tell me how to change the default value of MTU to 1500 except
the above two method. Or tell me what's the problem for the above problem.

Thanks a lot for your kind attention !

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