jf@ap.co.umist.ac.uk (John Forrest) (03/27/91)
We have ordered a Webster Multiport Gateway and are about to put in a Localtalk network for our Macs. In preperation we have put up CAP (to ensure it compiled on our Apollo's) and a few other things. We've got hold of atalkad, and have compiled that too. I am a bit concerned, though, about the issue of TCP subnets in the configuration. The program obviously supports them, but only refers to the use of whole number subnets. Since our group has a separate network, our group is allocated a registered TYPE C network address (192.84.82). This we subnet using three subnet bits, to give a potential of 6 physical networks of 30 nodes each. [subnetmask ffffffe0]. This serves us well because we have two physically separate networks as it is, and want to add one or two for the Localtalk networks. Essentially we plan to use two of the Multigates four Localtalk ports for standard use (one is to be dedicated to a laser, and the other kept spare for the moment). I was hoping to use two of the subnets for these - or have a single one (I'm not yet that concerned which). If I can't use subnets, this is going to be scuppered. Could someone please let me know if my plan is feasible, or if I have to work around this. The problem seems to be that of setting broadcasting addresses, but maybe it is worse. As far as I can tell, MacTCP is happy with subnets - it definitely allows you to set them up. John Forrest Dept of Computation UMIST
tom@wcc.oz.au (Tom Evans) (04/01/91)
In article <1991Mar26.192901.1670@cns.umist.ac.uk>, jf@ap.co.umist.ac.uk (John Forrest) writes: > We have ordered a Webster Multiport Gateway and are about to > put in a Localtalk network for our Macs. In preperation we have > put up CAP (to ensure it compiled on our Apollo's) and a few > other things. We've got hold of atalkad, and have compiled that > too. I am a bit concerned, though, about the issue of TCP > subnets in the configuration. The program obviously supports > them, but only refers to the use of whole number subnets. CAP maps "whole number" Class C subnets to IPTalk (AppleTalk) networks. Thus all CAP hosts that are on a Class C Subnet are deemed to be on the same AppleTalk network. Whether or not you are subnetted as you describe (subnetmask ffffffe0). It should work OK, as long as the routers handle the "full subnet" broadcast IP address properly (192.84.82.255). If this doesn't work properly you may need to run atalkrd. Possibly not though. If the MultiGate and the CAP host are on the same subnet it should be simple. > Essentially we plan to use two of the Multigates four Localtalk > ports for standard use (one is to be dedicated to a laser, and > the other kept spare for the moment). I was hoping to use two > of the subnets for these Completely separate subject. Setting up MacIP (protocol that supports MacTCP and NCSA Telnet etc.) is a completely separate issue to CAP. They aren't really related. I'll send you mail on this. > As far > as I can tell, MacTCP is happy with subnets - it definitely > allows you to set them up. But what it actually does with subnets is a mystery. It probably only uses this information when it is directly on Ethernet. Going through MacIP is another matter - the "routing decisions" are different. ======================== Tom Evans tom@wcc.oz.au ** ADD ".au" MANUALLY (don't trust "reply") ** Webster Computer Corp P/L, 1270 Ferntree Gully Rd Scoresby, Melbourne 3179 Victoria, Australia 61-3-764-1100 FAX ...764-1179 A.C.N. 004 818 455 wcc@cup.portal.com 2109 O'Toole Avenue, Suite J SAN JOSE CA 95131 - 1303 CALIFORNIA 1-408-954-8054 FAX 1-408-954-1832 wcc-uk@cup.portal.com Unit 7, Weltech Centre Ridgeway, Welwyn Garden City Hertfordshire AL7 2AA LONDON UK. Ph 44-707-336969 Mobile 44-836-725849 FAX 44-707-373378