Solved

SNMP broadcasts across subnets

Posted on 2007-11-16
1
777 Views
Last Modified: 2009-07-29
We recently installed a piece of software that discovers/manages the Neoware thin clients on our network.   It discovered the local thin clients successfully, but I had to make some modifications on our Cisco 3550 switch to enable the discovery broadcasts to cross to the other subnets.

First, I added a route on the computer with the management software pointing to the switch, then added the following on the switch (as suggested by NeoWare):
-------------------------------------
access-list 102 permit ip any any
access-list 152 permit ip any any
access-list 176 permit udp host 10.x.x.x any eq 161
access-list 176 deny ip any any
--------------------------------------
interface Ethernet1
ip access-group 102 in
ip access-group 152 out
ip directed-broadcast 176
--------------------------------------

I'm obviously skipping a lot of the config, but that's it in a nutshell, and it does the trick.   My question is: are there any drawbacks this?   There's ten subnets I'm looking across, connected via 10MB fiber, with only minimal (Citrix) data crossing, so there seems to be plenty of bandwidth; also, this entire setup is behind a firewall, so shouldn't be a security issue.

Again, we're not experiencing any problems, just want to make sure this won't cause us any problems in the future.
0
Comment
Question by:itatahh
1 Comment
 
LVL 28

Accepted Solution

by:
Jan Springer earned 250 total points
ID: 20301427
My standard is always "no ip directed-broadcast".

Do this:

access-list 102 permit udp host 10.x.x.x any eq 161
access-list 102 deny udp any any eq 161
<other statements here>
access-list 102 permit ip any any
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Suggested Solutions

This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
I eventually solved a perplexing problem setting up telnet for a new switch.  I installed a new Cisco WS-03560X-24P switch connected to an existing Cisco 4506 running a WS-X4013-10GE Sup II-Plus. After configuring vlans and trunking,  I could no…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now