Hi All,
First of all, i'm a new subscriber to this list. I have tried to go
through the archives for the problem i'm facing, but couldn't find any.
So if this question has already been answered before, please bear with
me.
Secondly, i'm a TOTAL newbie to Net-SNMP, SNMP in general, and linux
itself. I'm having to post here as i have been given a job to do and not
doing it is not an option for me. So please put on your kid-gloves! :-)
I am just trying this out on my desktop before i implement this in a
production environment, so i guess i can change many OS related settings
if required. (1 note - i am using runit on debian (not the default
init), and i have configured the snmpd daemon to run as a system service
using a startup script with the main command as:
> # exec snmpd -c /usr/local/share/snmp/snmpd.conf -f -D -A
> -Lf /var/log/snmpd/snmpd.log <My IP>:161
Please let me know if this is correct).
Now, on to the actual issue. I've downloaded the source for Net-SNMP,
compiled it with pretty much the default options, installed it , and
used the snmpconf perl script to configure it (following the
instructions to the best of my understanding).
When i try to use the simple utilities like snmpget, snmpwalk etc., the
only result i get is:
> <command>: Timeout
Of course since SNMP uses UDP i cannot telnet to check if the ports are
open. However, there are a couple of pointers that may help:
1. a netstat shows *NOTHING* in the socket state column for the SNMP
daemons.
# netstat -Naup
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address Foreign Address State
> PID/Program name
> udp 0 0 127.0.0.1:32768 127.0.0.1:syslog
> ESTABLISHED 3731/spamd child
> udp 0 0 127.0.0.1:32769 127.0.0.1:syslog
> ESTABLISHED 3732/spamd child
> udp 0 0 127.0.0.1:32770 127.0.0.1:syslog
> ESTABLISHED 3607/perl
> udp 0 0 0.0.0.0:32771 0.0.0.0:*
> 3603/snmpd
> udp 0 0 0.0.0.0:32772 0.0.0.0:*
> 3603/snmpd
> udp 0 0 0.0.0.0:32773 0.0.0.0:*
> 3603/snmpd
> udp 0 0 0.0.0.0:32774 0.0.0.0:*
> 3603/snmpd
> udp 0 0 127.0.0.1:32921 127.0.0.1:syslog
> ESTABLISHED 4198/spamd child
> udp 0 0 127.0.0.1:32922 127.0.0.1:syslog
> ESTABLISHED 4178/perl
> udp 0 0 <MY IP>:snmp 0.0.0.0:*
> 3603/snmpd
> udp 0 0 0.0.0.0:sunrpc 0.0.0.0:*
> 3311/portmap
Can anybody tell me what are these other sockets associated with snmpd
(the ones bound to 0.0.0.0)? And why the socket bound to the default
snmp port (UDP 161) doesn't show an ESTABLISHED state?
2. i tried to use nmap locally to determine the state of the ports. this
is what i got:
> # nmap -sU <MY IP>
>
> Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2007-01-02 12:02
> Interesting ports on <MY FQDN> (<MY IP>):
> Not shown: 1481 closed ports
>
> PORT STATE SERVICE
> 111/udp open|filtered rpcbind
> 161/udp open|filtered snmp
> 32771/udp open|filtered sometimes-rpc6
> 32772/udp open|filtered sometimes-rpc8
> 32773/udp open|filtered sometimes-rpc10
> 32774/udp open|filtered sometimes-rpc12
And according to the nmap man page "Nmap reports the state combinations
open|filtered and closed|filtered when it cannot determine which of the
two states describe a port." But when i run nmap for TCP Ports, it
shows the proper ports open (besides, i don't even have any firewall
running):
# nmap <MY IP>
>
> Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2007-01-02 12:06
> Interesting ports on <MY HOSTNAME> (<MY IP>):
> Not shown: 1673 closed ports
>
> PORT STATE SERVICE
> 22/tcp open ssh
> 25/tcp open smtp
> 80/tcp open http
> 110/tcp open pop3
> 111/tcp open rpcbind
> 143/tcp open imap
> 389/tcp open ldap
So does anyone have any idea WHAT is going on here? Am i even on the
right track? Please help! Please let me know if any more info is
needed.
- Thanks and regards,
Siddharth.
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