SNMP trouble

[el-half]

I was attempting to mess with the snmp daemon of my router. So I did a UDP port scan to be sure it was actually running:
161/udp open snmp

Ok, so I telnet (23/TCP) into my router and do a 'cat snmpd.cnf' and this is that config file's content:

sysDescr  "SANTIS 50 ADSL Router"

sysObjectID  1.3.6.1.4.1.3646.100.30

sysLocation  -

sysContact  -

sysName  -

snmpEnableAuthenTraps  0

community  private 0.0.0.0 write 1
community  public 0.0.0.0 read 0

trap  public 192.168.1.1

192.168.1.1 is my router's internal IP address.
I must not really understand this part:
community private 0.0.0.0 write 1
community public 0.0.0.0 read 0

trap public 192.168.1.1

I have downloaded a program to query snmp stuff (windows). As far as I know it should be possible to query the above things, no? sysDescr and sysObjectID?

I don't understand what is meant by 'trap'.
Upon querying using a Get request from my computer (192.168.1.3) this is returned: return code=10004 (Timed out)
I used public as the community string.

Can somebody explain what I should change in my router's config so that it does accept requests from all computers (inside lan).

[Shrekkie]

a snmp trap is a subdaemon you enable or set within the snmp-daemon. And on that trap you define if its ro (readonly) or rw (read/write) , as well as the hosts that may ro or rw that trap.

I believe your trap is now only accessible by or via 192.168.1.1. try changing that to 192.168.1.0/24 or 192.168.1.0 255.255.255.0.

Hope this helps,

[lithium_ion]

If you haven't already read it, appendix E of Perl for System Administrators is a good intro to SNMP.

20 minute SNMP tutorial


Also try the demo version of Solarwinds MIB Walk

HTH

[SirDice]

Originally posted here by .: Shrekkie :.
a snmp trap is a subdaemon you enable or set within the snmp-daemon. And on that trap you define if its ro (readonly) or rw (read/write) , as well as the hosts that may ro or rw that trap.

An SNMP trap is send to a host if some preset level is reached.
You can for example set a trap when the cpu usage is above 80%. The trap will be send to the defined host, running some management software (Openview i.e.), which in turn can alert an administrator (by email, SMS, pager etc.).

[el-half]

Thanks, Shrekkie's post made me confused too (no offense)....lol
So it's conceptually very similar to an os trap...

[SirDice]

Did you try this?

community public 192.168.1.3 read 0