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Conference 7.286::fddi

Title:	FDDI - The Next Generation

Moderator:	NETCAD::STEFANI

Created:	Thu Apr 27 1989
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2259
Total number of notes:	8590

1124.0. "MTU size, when will it be possible to change it? in Ultrix?" by STKHLM::PENNSATER () Fri Oct 22 1993 11:36

hi
i read note 638 in this conferance
On ultrix V4.3a
Mtu size on ethernet are 1500 bytes.
Are there any way to change the mtu size on the kernel on disk, to /vmunix on disk.

To get the mtu size of 1500 on the fddi interface:
from dbx /vmunix

dbx>  p  &fza_softc[0].is_ed.ess_ac.ac_if.if_mtu
0x..........

dbx> a  0x.........=0x5dc

Any more thoughts about this?
mats

T.R	Title	User	Personal Name	Date	Lines
1124.1	MTU Size.	STKHLM::PENNSATER		`Fri Oct 22 1993 12:20`	11
	hi IS, as mention in .0 , this a supported way of doing it? Will this work? If not, How could my customer acomplishe this? The customers bridge will only pass each packet on to the ethernet backbone, so he need a way to change the mtu-size. mats p
1124.2		NETRIX::thomas	The Code Warrior	`Fri Oct 22 1993 12:35`	9
	Supported? Not really. Will it work, yes. I usually do it via assign ifnet->if_mtu = 1500 or assign ifnet->if_next->if_mtu = 1500 depending on where it is in the ifnet list.