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RE: MTU of the Internet?
by Tony Hain 07 Feb '98

07 Feb '98

This thread has drifted all over the place and the only conclusions I can see are: The core infrastructure MTU is >= 1500 People are telling clients to set their Win95 MTU to 576 PMTU is randomly broken by clueless filtering Some dial-access devices are buffer limited A small MTU (53 byte?) would increase perceived response at the expense of performance I have been an advocate of the bigger defaults is better camp, but there is a real concern that the wrong values could actually cause more damage than their gain is worth. If the above list is incorrect or incomplete it would be useful for people to constructively tell Peter that now.

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Re: FDDI or 100Mb Ethernet
by Lewis Eatherton 07 Feb '98

07 Feb '98

FDDI would be my last choice. 100MB ethernet can be run full duplex, is less expensive, and far easier to troubleshoot. At 07:42 PM 2/5/98 -0500, Charles Sprickman wrote: >Hi, > >We colocate with our upstream, so we (thankfully) don't have to deal with >Bell Atlantic for our main Internet connection. We are currently running >a 10Mb ethernet link to our provider, but our contract allows for more >than that should we ever need it. Since the Bay ASN we now use will soon >be history and will be replaced by a shiny new(?) Cisco, I'm thinking of >upgrading the link now rather than later. > >We have a choice of FDDI or 100Mb ethernet. I'm thinking FDDI is better, >and not too much more expensive for our side. Are there any negatives >with FDDI? How does the 4000(?) Byte MTU affect things? All of our >outgoing links, T1 and ether are all 1500. Does the work of fragmenting >the packets down to 1500 amount to anything? All this talk about MTUs has >got me wondering. > >Thanks, > >Charles > >~~~~~~~~~ ~~~~~~~~~~~ >Charles Sprickman Internet Channel >INCH System Administration Team (212)243-5200 >spork(a)inch.com access(a)inch.com > > > Lewis Eatherton Network Architect SegaSoft, Inc 650.654.2318

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RE: MTU of the Internet?
by Peter Ford 07 Feb '98

07 Feb '98

There are other techniques such as split-TCP and Snoop that can be applied in place of a POP based Web cache. On the other hand, RAS/NAS servers that are under-buffered are not part of the solution space. trenchingly yours, peter > -----Original Message----- > From: Phil Howard [SMTP:phil@charon.milepost.com] > Sent: Friday, February 06, 1998 7:32 PM > To: ltd(a)interlink.com.au > Cc: nanog(a)merit.edu > Subject: Re: MTU of the Internet? > > > perhaps this is one of the not-so-obvious benefits of running a web > > proxy cache such as squid. the greater internet can have larger > > packets floating around, and the local proxy of the ISP can deal with > > horrible tcp stacks, retransmissions and client machine with small > > receive buffer sizes. > > And imagine having 2 interfaces on this machine, one with MTU=1500 and > one with MTU=576. > > -- > Phil Howard | no33ads4(a)dumb5ads.org ads6suck(a)dumb2ads.org > stop3it7(a)spammer9.com > phil | no0way72(a)lame7ads.net die8spam(a)no99ads1.net > eat7this(a)anyplace.com > at | w5x8y4z5(a)anyplace.com stop2it1(a)spammer0.com > a9b0c8d8(a)noplace4.com > milepost | die6spam(a)noplace8.com end6it79(a)no2place.com > a5b0c5d3(a)s0p8a2m1.edu > dot | crash053(a)anyplace.org crash981(a)spam6mer.com > end8it77(a)dumbads7.org > com | no20ads6(a)anyplace.org stop6221(a)dumb3ads.com > ads9suck(a)no7place.net

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RE: MTU of the Internet?
by Joe Provo - Network Architect 07 Feb '98

07 Feb '98

tonyhain(a)microsoft.com wrote: > This thread has drifted all over the place and the only conclusions I can > see are: > > The core infrastructure MTU is >= 1500 > People are telling clients to set their Win95 MTU to 576 > PMTU is randomly broken by clueless filtering > Some dial-access devices are buffer limited > A small MTU (53 byte?) would increase perceived response at the expense of > performance > You missed: HTTP is a painful protocol. jzp

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Re: Quality of Service by Ferguson and Huston
by Matt Magri 07 Feb '98

07 Feb '98

Hank Nussbacher <hank(a)ibm.net.il> wrote: >At 03:39 PM 2/4/98 -0500, Gordon Cook wrote: >>For ordering data on the book see: >>http://www.wiley.com/compbooks/catalog/24358-2.htm > >Or go to www.amazon.com and save 20% on Wiley's price (ISBN0471243582). It was even lower at www.bookpool.com when I checked there (searched for "Quality of Service"). They probably won't send you as many ads as Amazon, tho... ;-) Matt -- Matt Magri Netmeg Internet

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Re: High capacity wireless WAN equipment.
by Louis A. Destree 06 Feb '98

06 Feb '98

I want to thank all that replied to my query. For a while I tried to respond individually, but I was literally blown away with the volume of responses. I think I've got the information I need. Thanks to all who responded. Louis -- Louis A. Destree Senior Network Engineer FlashNet Communications destree(a)flash.net

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RE: Cross-country connectivity
by Joe Kawa 06 Feb '98

06 Feb '98

Adam, I'd check www.savvis.com Joe Kawa, jkawa(a)savvis.com Manager, SAVVIS NCC 888 - NETOPS1 -----Original Message----- From: Adam Rothschild [SMTP:asr@millburn.net] Sent: Friday, February 06, 1998 10:06 AM To: nanog(a)merit.edu Subject: Cross-country connectivity NANOG people: I would like to obtain a cross-counrty dedicated data circuit (NYC <-> LA to be exact), and I would like suggestions regarding telco/topology/technology/etc. I would like something that can provide ~ 200k - 1.5M of bandwidth, and is relatively inexpensive. Any suggestions/insight would be greatly appreciated. -=asr

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Cross-country connectivity
by Adam Rothschild 06 Feb '98

06 Feb '98

NANOG people: I would like to obtain a cross-counrty dedicated data circuit (NYC <-> LA to be exact), and I would like suggestions regarding telco/topology/technology/etc. I would like something that can provide ~ 200k - 1.5M of bandwidth, and is relatively inexpensive. Any suggestions/insight would be greatly appreciated. -=asr

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Re: High capacity wireless WAN equipment.
by Douglas Kerry 06 Feb '98

06 Feb '98

By far the most comprehensive site on wireless LANs/MANs I've found is http://hydra.carleton.ca/info/wlan.html Doug Kerry Sr Network Engineer SuperNet, Inc., a Qwest Company kerry(a)sni.net

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Re:High capacity wireless WAN equipment.?
by Trevor Izsak 06 Feb '98

06 Feb '98

This may be of interest to you, Nortel bought BNI ( a leader in broadband wireless tech.) and they are supplying broadband LMDS products to Teligent. Check out www.nortel.com or www.broadbandnetworks.com (good site for product info) Trevor...

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