Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!pasteur!ucbvax!ntt-20.ntt.jp!MURAKAMI
From: MURAKAMI@ntt-20.ntt.jp (ken-ichiro murakami)
Newsgroups: comp.protocols.tcp-ip
Subject: HYROUTE(TCP/IP gateway between HYPERchannel and ethernet)
Message-ID: <12399974875.18.MURAKAMI@NTT-20.NTT.JP>
Date: 21 May 88 20:36:22 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 42

I have some questions about address mapping between HYPERchannel and IP
address. Please let me know if you know HYROUTE mapping mechanism.

  We are using HYROUTE on SUN to connect hosts on HYPERchannel and hosts
on ethernet by TCP/IP.  We used class A IP address on Hyperchannel and
class C IP address on ethernet so far. We did not obtained the class A
address from SRI-NIC. This is because these hosts are isolated from
our main network. Recently, we decided to connect the HYPER channel
network to our main network and change the address from class A to
subnetted class B which we obtained from SRI-NIC. When I asked our
support engineer to change it, he told me that it was impossible to
use subnetted class B address on HYPERchannel. I heard the problem was
caused by HYROUTE address mapping facility. 

  Since I could not find HYROUTE documents around me, I estimated the
mapping from /etc/hosts, /etc/networks and /etc/hycf files. It seems
there is no dynamic mapping between HYPERchannel address and IP
address. Static mapping is employed. In addition to it, the mapping is
so simple and HYPERchannel address(8bit physical address + 8bit
logical address) is used as the lower 2 byte of IP address. It
consumes a lot of IP address. Our network address is class B and we
cannot afford to assign a lot of subnet and host address to
HYPERchannel. So, I'd like to ask you the following questions;


(1) Is there any way to save IP address on HYPERchannel?
(2) Why does HYROUTE need class A address on HYPERchannel?
(3) Where are the documents for HYROUTE and its mapping algorithm?
    Is it possible to get it?


Thanks in advance.

					KEN
			murakami%ntt-20.ntt.jp@relay.cs.net

	Ken-ichiro Murakami
	NTT Laboratories
	3-9-11, Midori-cho, Musashino-shi
	Tokyo, 180 Japan

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