Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!rutgers!att!tut.cis.ohio-state.edu!ucbvax!CAYMAN.COM!brad From: brad@CAYMAN.COM Newsgroups: comp.protocols.appletalk Subject: Re: Need help with Telneting across Zones with Fastpath Message-ID: <9011241409.AA10478@andros.Cayman.COM> Date: 24 Nov 90 14:09:09 GMT References: Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 53 >> Date: 21 Nov 90 14:09:46 GMT >> From: usc!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!ra!jhh1@apple.com (Jim Harfst) >> Subject: Re: Need help with Telneting across Zones with Fastpath >> >FastPaths and GatorBoxes ONLY BRIDGE IP TRAFFIC THAT ARE WITHIN THEIR >> >STATIC OR DYNAMIC RANGES. If you IICX's IP address is not maintained >> >by the box, IT WILL NOT forward it. (Sorry for all the caps, but I am >> >trying to stress a point in stupidity on the part of Kinetics and Cayman.) >> >> >Mike Temkin >> >mst@csun.edu >> >Cal. State U. Northridge, School of Engineering and Computer Science I will go out on a limb here and make some assumptions. 1) is that the Mac IIcx is in a different zone than the fastpath or gatorbox. 2) is that you won't call me stupid, as I wrote the code that does this in the gatorbox and am working with the IETF workgroup to standardize the protocol. The problem may be that given the current "psuedo standard" protocol for encapsulating IP inside AppleTalk, statically assigned addresses are not accessible from zones other than the localtalk zone of the gateway. Why? The gateway needs to establish a mapping between the appletalk address of the macintosh and the macintosh's IP address (just like ARP does with hardware addresses on ethernet). With static addressing, no conversation occurs between the macintosh and the gateway. Note: dynamically assigned addresses will work in this case. This is because the macintosh will "talk" to the gateway and "ask" for an IP address. At the time of "asking", the gateway can remember the appletalk source address and complete the ip address to appletalk address mapping. Statically assigned addresses work on the local zone becase the gateway will "arp" using NBP in the local zone for the mac's IP address. Mac's not in the local zone (like your mac, behind a netbridge) will not see these lookups and will not respond. Two simple enhancements can solve this (warning - oversimplification of a solution comming) 1) is to have the gatorboxes and fastpaths configured with a "list of zones" to search for statically assigned IP addresses. You could then add the zone name which you Mac IIcx resides to this list and be happy. 2) is to extend the protocol to include a way for statically assigned mac's to "talk" to the gateway to establish their mapping. I would not be suprised if both solutions arrive at around the same time. (and of course, everything I have said here may be wrong - feel free to send me e-mail if more explaination would help) -brad