---------- X-Sun-Data-Type: text X-Sun-Data-Description: text X-Sun-Data-Name: text X-Sun-Charset: us-ascii X-Sun-Content-Lines: 94 original question was: >Hi > >We have a class B Network that looks like this > > >Netmask 255.255.255.0 147.86.128.x backbone 10BASE5 >---------------------------------------------------------- > | | > +---------------+ more hosts, more router > | Sun Router | > +---------------+ > | >Netmask 255.255.255.0 | 147.86.192.x > > > >This was ok for the last two years, but now we need more IP addresses >on the backbone. My idea was to change the netmask to >255.255.240.0 . This is great, giving me much more addresses where >I need it. This is bad, leaving us only 15 subnets. >With different netmasks within our Network, we could have both: >more addresses on the backbone, 15 subnets each containing >up to 15 subnets. This would look like: > > >Netmask 255.255.240.0 147.86.x.x backbone 10BASE5 >---------------------------------------------------------- > | | > +---------------+ more hosts, more router > | Sun Router | > +---------------+ > | >Netmask 255.255.255.0 | 147.86.192.x > > > >This would also be cool because I wouldn't have to change all the >netmasks behind the various routers on the backbone. > >But... > >Sun says in its answerbook: (SunOS 5.3) >"If you are going to subnet, you will need to select a network-wide >netmask". - I guess different netmasks on a sun router do not work. > > >So I ask you: > >- has anybody out there a class B network with different netmasks and > would be so kind to tell me, how he has done it? > >- are there other specialized routers, who can manage different netmasks ? > >- can DEC or HP Workstations act as routers with different netmasks ? > >- Is my idea about this subject weird and there are much better solutions for > this problem ? > > >any answer will be appreciated > >Beat Heggli > There are different opinions on this subject. - John O'Connor sent me a summary from an earlier request to the mailing list. - Kevin Sheehan says a netmask applies to the whole address - Glenn Satchell suggests to create some more subnets, he knows that Cisco routers can handle different netmasks - Vippin Chadha says about the same as Kevin Sheehan - Kenneth Okenka has done it with CISCO Routers - Cindy Yoho has done it - Russ Poffenberger says it is a violation of the spec - Paulo Licio de Geus had bad exprience with the RIP routing protocol - Steve Ozoa tells you something usefull about routing protocols - Michael Myers says the subnet mask need to be the same for the entire network - Dave Russell did it with OSPF - Steven Dick did it as well and tells you how it has to be done. - Todd Miller has done it with cisco routers I set up a router on our backbone to join 2 subnets in one, giving me some breath for new hosts on that segment. Then we are going to take away some routers and put in bridges instead. After that I'm going to test a configuration with different netmasks with a Solaris 2.4 host. And at the turn of the century we will get a brand new fibre backbone. Thanks and by ---------- X-Sun-Data-Type: mail-file X-Sun-Data-Description: mail-file X-Sun-Data-Name: John O'Connor X-Sun-Encoding-Info: uuencode X-Sun-Content-Lines: 277 begin 600 John O'Connor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end ---------- X-Sun-Data-Type: mail-file X-Sun-Data-Description: mail-file X-Sun-Data-Name: Michael Myers X-Sun-Encoding-Info: uuencode X-Sun-Content-Lines: 93 begin 600 Michael Myers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end ---------- X-Sun-Data-Type: mail-file X-Sun-Data-Description: mail-file X-Sun-Data-Name: Dave Russell X-Sun-Encoding-Info: uuencode X-Sun-Content-Lines: 39 begin 600 Dave Russell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