Path: utzoo!utgpu!watserv1!watmath!att!ucbvax!PAN.SSEC.HONEYWELL.COM!thompson From: thompson@PAN.SSEC.HONEYWELL.COM (John Thompson) Newsgroups: comp.sys.apollo Subject: re: TCP routing from ring through node to ether on SR10.2? Message-ID: <9008311845.AA20019@pan.ssec.honeywell.com> Date: 31 Aug 90 18:45:33 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 44 > I've got 4 SR10.2 machines on a ring, addresses 128.183.30.1, 2, 3, 4. > I'd like to route through # .30.1 and out via its ether, address .10.55. > I wasn't able to get it running under 9.7 and haven't been able to get it > to work under 10.2. > > The gateway node gets to the rest of the ether world as well as the nodes > on the ring. The ring nodes can telnet to the ring (.30.1) and ether > (.10.155) side of the gate, but can't get past that to anywhere useful. > > What the solution, subnets? I'm using gateway masks: > /etc/ifconfig dr0 128.183.30.1 netmask 255.255.255.0 > /etc/ifconfig eth0 128.183.10.155 netmask 255.255.0.0 broadcast 0 > and the other ring nodes are likewise masked 255.255.255.0 > > If I mask the ether side also 255.255.255.0 then the rest of the ethernet > people yell at me about bogus broadcasts. The default route on the ring > nodes is to the ring address of the gateway (.30.1). Some networkers here > have mentioned Proxy ARP, but I'm not sure what it is, or how to do it. Yell at the ethernet people. You're correct in your subnetting. The guys (nodes) on the ethernet are busy thinking that packets going to 128.183.30.2 (in the ring) are host 30.2 on network 128.183 -- THEIR OWN NETWORK! Because of this, they don't bother sending it to your gateway! > I can't be the only one using this ring/ether gateway configuration... How > did you solve it? We had the exact same problem. One of our ethernet machines was not using subnets. It could reach our gateways; our gateways could reach it; no other combo worked. When we set subnets up (all the other nodes already had them), everything was fine. John Thompson (jt) Honeywell, SSEC Plymouth, MN 55441 thompson@pan.ssec.honeywell.com As ever, my opinions do not necessarily agree with Honeywell's or reality's. (Honeywell's do not necessarily agree with mine or reality's, either) It doesn't matter whether you win or lose -- it's how you place the blame!