torstein@nic.forut.no (Torstein Meyer) (06/25/91)
We have tried out a number of sollutions, though admitting a lack of
internet and routing know-how. Our set up is :
---- ethernet --------|------------------------|-----------------
le0 le0
eldo.forut.no rado.forut.no
fza0 fza0
|========= fddi =========|
Both eldo and rado being DEC Station 5000/200 running Ultrix 4.1 with
fddi adapters and ethernet adapters installed.
How do we set up this to avoid any traffic accross the fddi segment but
the traffic between eldo and rado, still being able to perform any nor-
mal ethernet(tcp/ip) traffic using the common ethernet ????
Any solutions or hints are welcome concerning
ifconfig
/etc/hosts
/etc/networks
/etc/rc.local
routed ?
....
Our attepmts often gave odd warnings, such as ....
# ping feldo
feldo.fddi is alive
# ping nic
icp->icmp_type (5) != ICMP_ECHOREPLY (0)
nic.forut.no is alive
# ifconfig fza0 down
Torstein Meyer torstein@forit.forut.no +47 83 80 150
Syst.cons FORUT-IT +47 83 82 420 (fax)
Box 2806 Elverhoy N-9001 Tromsoebarmar@think.com (Barry Margolin) (06/25/91)
In article <torstein.677787597@nic.forut.no> torstein@nic.forut.no (Torstein Meyer) writes: >---- ethernet --------|------------------------|----------------- > le0 le0 > eldo.forut.no rado.forut.no > fza0 fza0 > |========= fddi =========| >How do we set up this to avoid any traffic accross the fddi segment but >the traffic between eldo and rado, still being able to perform any nor- >mal ethernet(tcp/ip) traffic using the common ethernet ???? If eldo and rado's ethernet interfaces are connected to the same subnet, as indicated in your diagram, you shouldn't need to do anything. The fddi segment will always add a hop to any route to any other host on the ethernet, so it should never be chosen. You can make sure that eldo and rado are never used as gateways by specifying the "-q" option to routed, which prevents them from broadcasting their routing tables. >Our attepmts often gave odd warnings, such as .... ># ping feldo >feldo.fddi is alive I assume "feldo" is the name you've given to eldo's fddi address? ># ping nic >icp->icmp_type (5) != ICMP_ECHOREPLY (0) >nic.forut.no is alive ICMP type 5 is a redirect. Your default gateway was simply informing you of a better gateway to use to get to nic.forut.no. You haven't given any reason for me to think this is unreasonable. ># ifconfig fza0 down Did you mean to show the behavior resulting from shutting down the fddi interface? -- Barry Margolin, Thinking Machines Corp. barmar@think.com {uunet,harvard}!think!barmar