Path: utzoo!utgpu!water!watmath!clyde!bellcore!tness7!killer!osu-cis!tut.cis.ohio-state.edu!mandrill!gatech!purdue!decwrl!ucbvax!SKL-CRC.ARPA!symchych From: symchych@SKL-CRC.ARPA (Tim Symchych) Newsgroups: comp.protocols.tcp-ip Subject: Re: Linking LAN's via Public X.25 Message-ID: <8806031954.AA28270@skl-crc.arpa> Date: 3 Jun 88 19:54:59 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 21 Dan: Yes, there are still versions of IP around in hosts that do not perform well. Regardless of some of the fine work that has been done in end-to-end performance, we still use what comes off the shelf, and if the vendors don't put it out in the product, then we don't have it. Most of our sites have no interest in "patch and run" systems for their users. Many people on this mailing list have covered this problem, including the problems of mixing speeds on segments of the path that traverse ethernet, leased lines and non-IP packet switched nets. Except for ethernet LANS, all our links between hosts use combinations of different link types. I guess that in our case, X.25 is the least of our problems. Something I forgot to mention is that in our PDN connections at 9600, we use 256 byte packets with a window size of up to 7 packets. I also received some hints on the 56 kbps X.25 line to our Butterfly from Dave Capshaw at Lockheed. Seems that some tuning may be possible between the PSN and the Butterfly. regards tim