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Conference 7.286::fddi

Title:	FDDI - The Next Generation

Moderator:	NETCAD::STEFANI

Created:	Thu Apr 27 1989
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2259
Total number of notes:	8590

385.0. "bootp & DECfoo 500s" by MIPSBX::thomas (The Code Warrior) Mon Nov 04 1991 17:43

On the LKG LAN, I've notice that a significant amount of IP broadcast traffic
is due to the bootp requests of various DECconcentrators and DECbridges.  Since
bootp PDUs are addressed to 255.255.255.255, all IP hosts must at least do a 
UDP port lookup.

Why doesn't the FDDI f/w implement backoff timers for bootp as is done for
MOP?  Most of the gear seems to reissue bootp requests every 75 seconds or so.

Of hosts issuing unanswered bootp requests, 10 are DEFEBs, 14 are DEFCNs,
11 are VT1000s, 1 is a DS3100, and 2 are DECservers.

Since 4am today of ~17000 bootp requests, 16500 are from DEFEBs or DEFCNs.

T.R	Title	User	Personal Name	Date	Lines
385.1		COMICS::WOODWARD	Smile!	`Tue Nov 05 1991 06:00`	6
	Just a guess, if you're running v3.x firmware in the boxes AND haven't given them an IP address they'll continually request this address by trying a BOOTP about every 1 minute - is this your problem? if so issue the devices with IP addresses and they'll shut up. Steve
385.2		NAC::THOMAS	The Code Warrior	`Tue Nov 05 1991 06:49`	1
	I understand that. But the retry interval is too small in any case.
385.3		LEVERS::ANIL		`Tue Nov 05 1991 17:40`	8
	The backoff algorithm and retry interval used in DEFEB and DEFCN are as per the bootp spec (rfc951) which calls for an eventual 64 seconds (with random fudge) retry. Your comment is noted, however. The LKG devices should be assigned IP addresses soon.. your note has hopefully been forwarded to the network manager. Anil
385.4	DECbridge bootp request every 3 seconds or so...	KERNEL::LLOYDA	Don't worry... Be Happy ;^)	`Mon Apr 19 1993 12:24`	9
	Hi, What file is the Bridge actual going to ask for (or is it just going to try and get it's IP address from it) ? Is there anyway to configure a host to send the IP address that it is requesting ? Alan.
385.5	See 921.4	QUIVER::WALTER		`Mon Apr 19 1993 18:14`	4
	See note 921.4. The bridge only looks for the IP address in the bootp reply. Some Unix systems insist that a load file be specified in the bootptab file, so create an empty file. I think that should work.
385.6	Thanks...	KERNEL::LLOYDA	Don't worry... Be Happy ;^)	`Tue Apr 20 1993 05:40`	3
	Thanks for the info... Alan. :*)