tkevans@fallst.UUCP (Tim Evans) (01/05/91)
I'm adding 4 VAX 11/750's with *binary-only* 4.2BSD licenses
(previously running on an XNS network) to a TCP/IP
network. The network is a Class B network, with a 255.255.255.0
netmask. 4.2BSD seems not to understand subnetting, so the
first such machine on the net sees only itself and a few
others (386's with an older TCP/IP) which also don't understand
subnetting.
What can be done with 4.2BSD to make things work?
PLEASE NOTE: As indicated above, we do not have source for
4.2BSD. (Long story, not appropriate here.)
Thank you.
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Tim Evans 2201 Brookhaven Ct, Fallston, MD 21047bob@MorningStar.Com (Bob Sutterfield) (01/06/91)
In article <1873@fallst.UUCP> tkevans@fallst.UUCP (Tim Evans) writes:
What can be done with 4.2BSD to make [subnets] work?
Euthanasia? :-)
Proxy ARP can fool old IP implementations into dealing with modern
networks. Get tut.cis.ohio-state.edu:pub/proxyarp/proxyarpd.shar.Z
and run it on something nearby that already knows about subnetting.0004219666@MCIMAIL.COM (Bob Stine) (01/06/91)
>I'm adding 4 VAX 11/750's with *binary-only* 4.2BSD licenses >(previously running on an XNS network) to a TCP/IP >network. The network is a Class B network, with a 255.255.255.0 >netmask. 4.2BSD seems not to understand subnetting, so the >first such machine on the net sees only itself and a few >others (386's with an older TCP/IP) which also don't understand >subnetting. >What can be done with 4.2BSD to make things work? If your gateways can do proxy arp, then you could tell the 4.2 hosts that they are attached to a net with mask 255.255.0.0. Proxy arp (a.k.a. "the arp hack," "promiscuous arp") is generally considered to be a kludge, however. Otherwise, you could install host routes for all the hosts on remote subnets with which the 4.2 needs to communicate. Failing these workarounds, I think that you are wedged, although I will be watching this space with interest. - Bob Stine bstine@MCIMail.com