Don't forget "the Simplicity Principle!" :-) I liked MADMAN's answer best. He's a CCIE and it shows.
Without some idea of the fellow's topology, we can't recommend VLANs, and, although I know VLANs are extremely popular and the obvious choice for some situations, they add complexity that may not be necessary. And recommending Mobile IP for something as simple as this is definitely overkill. Priscilla Xia Hongbing wrote: > > One thing I want to mentioned is that Mobile IP can solve your > problem. You > can move to another place without changing your IP address, but > still keep > connection. However, you must configure both floor 1 and floor > 2 router to > support Foreign agent and home agent function. Your computer > client also > support mobile IP registration. > > ----- Original Message ----- > From: "Priscilla Oppenheimer" > To: > Sent: Thursday, January 09, 2003 4:58 PM > Subject: RE: Subnet question [7:60711] > > > > Larry Letterman wrote: > > > > > > thats pris's job here....if she writes enough detailed > > > answers we dont have to buy her books...:) > > > > Oh no! > > > > By the way, the only nicknames that are supported are Cilla, > PO, (and Cil, > > if you are Chuck.) Nicknames that map to "sissified" have > been deprecated. > > The preferred name is my canonical name, Priscilla. :-) > > > > > > > > Larry Letterman > > > Network Engineer > > > San Jose Transport > > > Cisco Systems Inc. > > > > > > > > > > > > > -----Original Message----- > > > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On > > > Behalf Of > > > > Tamhankar, Nitin > > > > Sent: Thursday, January 09, 2003 11:18 AM > > > > To: [EMAIL PROTECTED] > > > > Subject: RE: Subnet question [7:60711] > > > > > > > > > > > > Thank you very much for taking pains to right such a > detailed > > > explanation. > > > > Thank you all for your answers they were very helpful. > > > > > > > > Thanks > > > > Nitin > > > > > > > > -----Original Message----- > > > > From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] > > > > Sent: Thursday, January 09, 2003 12:36 PM > > > > To: [EMAIL PROTECTED] > > > > Subject: RE: Subnet question [7:60711] > > > > > > > > > > > > You may not need virtual LANs. Real LANs solve the > problem. > > > :-) This is a > > > > classic case of subnetting. > > > > > > > > With DHCP, the client should get the right address when it > > > > broadcasts after > > > > it moves, so there's no issue. > > > > > > > > Leaving DHCP out of the picture, the need to ensure that a > > > moved > > > > node can't > > > > communicate is met simply by the way IP works. > > > > > > > > Assume there's a client with this config: > > > > > > > > address = 100.10.1.100 > > > > subnet mask = 255.255.255.0 > > > > default gateway = 100.10.1.1 > > > > > > > > Assume the client is physically sitting on the > 100.10.2.0/24 > > > network. When > > > > it wants to send to nodes on the 100.10.1.0 network, it > will > > > compare its > > > > address with the destination address, assume it's on the > same > > > subnet, and > > > > send an ARP broadcast. The ARP broadcast won't reach the > > > > destination though, > > > > which is on a different LAN, so it won't work. > > > > > > > > (Make sure the router isn't configured for Proxy ARP. But > > > even with Proxy > > > > ARP, communication won't work. With Proxy ARP, the router > > > could respond on > > > > behalf of the destination on the 100.10.1.0 network. > However > > > that host > > > > wouldn't be able to respond because it would assume that > > > 100.10.1.1 is > > > > local.) > > > > > > > > Assume the client wishes to reach devices on the > 100.10.2.0 > > > or 100.10.3.0 > > > > network. It will compare its address with the destination > > > address > > > > and decide > > > > that it's not on the same subnet, so it needs to send to > the > > > default > > > > gateway. It will send a broadcast for the default gateway, > > > which > > > > won't work > > > > because 10.10.1.1 is on a different LAN. Once again make > sure > > > Proxy ARP is > > > > disabled. I'll leave it to the reader to figure out what > > > would happen in > > > > this case if Proxy ARP were enabled. :-) > > > > > > > > The question of VLANs versus real LANs requires more info. > > > How many router > > > > ports to you have? Is each router port a subnet? Or do you > > > plan to have > > > > multiple subnets out one router port, in which case you > need > > > VLANs and > > > > inter-VLAN routing on the router. > > > > > > > > _______________________________ > > > > > > > > Priscilla Oppenheimer > > > > www.troubleshootingnetworks.com > > > > www.priscilla.com > > > > > > > > Nathan Nakao wrote: > > > > > > > > > > I'd probably use VLAN's. > > > > > > > > > > Conf t > > > > > Int vlan 101 > > > > > Int vlan 102 > > > > > Int vlan 103 > > > > > > > > > > Then setup the DHCP to assign IP addresses accordingly. > > > > > > > > > > Once that is done. Set the vlans to 101 for first > floor, 102 > > > > > for second > > > > > floor, and 103 for third floor. > > > > > > > > > > -----Original Message----- > > > > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]] > > > On > > > > > Behalf Of > > > > > Tamhankar, Nitin > > > > > Sent: Thursday, January 09, 2003 8:40 AM > > > > > To: [EMAIL PROTECTED] > > > > > Subject: Subnet question [7:60711] > > > > > > > > > > > > > > > This might be a very elementary question for some of you > > > guys > > > > > but I > > > > > would appreciate the answer. > > > > > > > > > > If an office which has 3 different floors and has Cisco > > > routers > > > > > and > > > > > catalyst switches and windows environment. We need to > > > configure > > > > > it in > > > > > such a way that each floor is on its own subnet for > example > > > > > > > > > > floor1 100.10.1.0 > > > > > floor2 100.10.2.0 > > > > > floor3 100.10.3.0 > > > > > > > > > > Also if a computer which has IP address in subnet > > > 100.10.1.0 is > > > > > moved > > > > > from floor 1 to floor 2, it should not communicate with > the > > > > > network > > > > > unless its IP address is changed to one in 100.10.2.0 > > > subnet. > > > > > > > > > > How it can be accomplished? > > > > > > > > > > Thank you > > > > > Nitin > > > > > > > > > > [GroupStudy.com removed an attachment of type > > > > > application/ms-tnef] > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=60846&t=60711 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
