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James Neave wrote:
<snip>
> Question:
> 
> I have lots of remote sites with some "business" ADSL routers that have
> SNMP (SNMP v1/v2 agent MIB-II and ADSL Line MIB). Does SNMP work
> cross-subnet and is it secure?

SNMP uses IP, so it's routable and can work across the entire internet.

There are many versions of snmp, the newer ones can be fairly secure,
but it's still not generally something you want to expose to the world.

I prohibit all external (internet) access to snmp with firewall rules,
allowing only my known data-gathering systems access.  I also typically
set all communities read-only since I'm mainly monitoring, rather than
trying to control things with snmp.

Remember, if you're going out across the internet and are not using a
VPN, the info in your snmp packets (including the community string, and
any responses that might contain sensitive data) will be unencrypted and
sniff-able by any systems between your two locations.  You have to
decide what constitutes an 'acceptable' level of security for your needs.

- --
Charles Steinkuehler
[EMAIL PROTECTED]
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