At 2:57 PM -0800 3/20/98, Kent W. England wrote:
As I recall, the world didn't end when the NSFNET NSSs were installed and they decremented TTL twice. Weren't they changed to decrement once, appearing as one instead of two routers?
You got this part right. I thought we had heard the last of the TTL whining then. Apparently we haven't made much progress in the last eight years.
(For those who don't remember the NSFNET "routers" they consisted of an IBM RS6000 attached to each of several T1/T3 interfaces, interconnected across a FDDI with a route server. Nine RS6000s in all. 200 amp service required. :-)
But this part is wrong. The description above is kind of a combination of the T1 NSS (rack of RTs, each RT services at most a single T1 or Ethernet, they talk to a route processor) and the T3 NSS (RS/6000 with autonomous port cards, pretty similar to any modern router). There's a half-decent description of the NSS architecture at http://www.merit.edu/nsfnet/ Historically yours, --John -- John Scudder email: jgs@ieng.com Internet Engineering Group, LLC phone: (734) 213-4939 x14 122 S. Main, Suite 280 fax: (734) 669-8661 Ann Arbor, MI 48104 www: http://www.ieng.com