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Conference netcad::hub_mgnt

Title:	DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:	Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:	NETCAD::COLELLADT

Created:	Wed Nov 13 1991
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	4455
Total number of notes:	16761

2736.0. "What protocol types to pass for SNMP please ?" by CHEFS::HANCOCK_M (Use what you (used to) sell) Mon Sep 11 1995 10:04


	Hi,
		I wish to manage remote entities with HUBwatch using SNMP,
		and these entities are the far side of a Brouter-brouter link
		where the brouters are in bridging mode.

	The brouters are set up to filter everything except the usual stuff
	(LAT,DECnet etc).I would like to know what protocol type to let through
	to allow SNMP management.If we pass everything,it works,but this is not
	ideal,so which protocol types do we need to allow please ??

	I checked the LAN address and protocol registry document,but not very
	helpful,only Digital-assigned addresses,presumably SNMP is in the
	public domain ?

				Cheers Mick 

	Cross Posted in HUB_MGMT and ETHERNET

T.R	Title	User	Personal Name	Date	Lines
2736.1	Protocol Type IP (0x0800).	WARFUT::NAEEM		`Mon Sep 11 1995 11:45`	8
	SNMP uses IP as network protocol.So ,let 0800 (protocol type) through.Also ,SNMP uses UDP as Transport .If filtering on brouter allows ,then allow UDP only. Naeem.
2736.2		FOUNDR::OUIMETTE	Eyes of the World	`Mon Sep 11 1995 12:50`	29
	From the ethernet conference; you would also need to bridge ARP (08-06) if the station/agent are in the same subnet, and you may want to be cautious there... <<< UPSAR::USER$411:[NOTES$LIBRARY]ETHERNET.NOTE;1 >>> -< Ethernet Volume 3 >- ================================================================================ Note 730.2 What protocol types to pass for SNMP please ? 2 of 2 FOUNDR::OUIMETTE "Eyes of the World" 16 lines 11-SEP-1995 12:48 -< Bridge ARP traffic cautiously... >- -------------------------------------------------------------------------------- And, to add to Brad's reply, be cautious about enabling bridging of ARP (08-06). If the customer is filtering everything except DECnet/LAT etc, then it may be because they want to block excessive broadcast traffic. Whenever possible, IP should be routed, not bridged. This may or may not be practical for your customer, depending upon their IP topology. If "real" routing of IP is a problem, you can either place the snmp agent in a private, non-advertised subnet, or utilize proxy arp on the DECbrouter to create a "hidden" subnet. If you have questions about setting up DECbrouters as above, post them in KALI::DEWBR. And if excessive B'cast traffic isn't a problem, disregard all of the above & just bridge the beast..... :^) -chuck