mcr@Sandelman.OCUnix.on.ca (Michael Richardson) (05/28/91)
A day or two ago I wrote: > I spend part of Thursday and Friday testing out a SLIP connection >between fts1 (aka fts.ocunix.on.ca) and latour (aka >latour.sandelman.ocunix.on.ca). > fts1 is a 25Mhz AMI Mark II 386 board running ISC 2.2 > latour is a Sun 3/60 running SunOS 4.1(.0) with the streams based code from >Rayan Zachariassen (UofT). > Both have 8Meg of ram and a T2500. > The biggest problem I had was with MTU sizes. RFC 1055, and my Sun >slip stuff recommend a 1006 byte MTU in order to be compatible -- I >can see the reasoning for increasing this with MNP modems. > How can I decrease it with the ISC slip implementation? How can I >even find out what it is? /etc/conf/mdevice.d/slip/Space.c The above file revealed nothing at all. This problem is really annoying me. I was about to increase the MTU to 8192 on the Sun end (which just involves editing /usr/include/sys/slip.h and recompiling) when I realized that it may now be too big the other way. Short of poking around the live kernel (which I may start doing in a moment) how can I find out the value of ifnet->if_mtu? Neither ifconfig nor netstat seem to allow me to do that. Can anyone offer any advice on poking around ISC 386/ix kernels? :!mcr!: -- :!mcr!: | The postmaster never | So much mail, Michael Richardson | resolves twice. | so little time. HOME: mcr@sandelman.ocunix.on.ca Bell: (613) 237-5629 Small Ottawa nodes contact me about joining ocunix.on.ca!