[smokeping-users] Forcing SNMP over TCP vs. UDP

Peter Kristolaitis alter3d at alter3d.ca
Tue Feb 2 19:38:12 CET 2010

That probe uses the Net::SNMP module to manage SNMP queries.  IIRC,
Net::SNMP defaults to using UDP, however it will switch to TCP if it
can't reach the host via UDP.

Can you confirm whether you can reach the router with UDP from the
server hosting Smokeping by using other SNMP tools (e.g. snmpwalk, etc)?

- Peter

Schaibley Dean wrote:
> Need some help here.  Is there a way to Force SNMP to use TCP 161 or
> UDP 161?  Most all of our smokeping traffic is using UDP 161, but
> somehow, we do have some that is using TCP 161 (not sure how/why).
> Our firewalls are only config'd for allowing UDP 161, so when the
> Smokeping process tries to use TCP it is failing at the firewall (and
> Security won't allow TCP without justification).
> We are running Smokeping 2.3.6 with the CiscoRTTMonEchoICMP as the Probe.
> Any help/tips would be greatly appreciated.
> Dean Schaibley
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