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[Openvpn-users] SNMP problems with OpenVPN


  • Subject: [Openvpn-users] SNMP problems with OpenVPN
  • From: "abhilash s" <abhilashachu@xxxxxxxxx>
  • Date: Thu, 8 Feb 2007 04:48:28 -0500

Hi All,

        My router's Private IP is 192.168.1.1 and its VPN IP is
10.10.10.11 . My VPN server IP address is 10.10.10.1. When I run the
command " snmpwalk -v2c -c  public 192.168.1.1 "
from my LAN machines it will shows the output . But When I tried to
run the same  command from my VPN server it fails and shows this
message : " Timeout: No Response from  192.168.1.1 "  . The
interesting thing is that if I run the command "snmpwalk -v2c -c
public 10.10.10.11 " It will give the output correctly .

I can Ping both the vpn IP and LAN IP of my router from VPN
Server(10.10.10.1) . Also I can run the commands  "snmpwalk -v2c -c
public 192.168.1.1" and  "snmpwalk -v2c -c public 10.10.10.11 " from
any LAN Machines .

The log I have taken with tcpdump is like the follwoing :

1. snmpwalk -v2c -c public 10.10.10.11 -- > from VPN Server


04:06:36.459388 IP 10.10.10.1.36122 > 10.10.10.11.161:  C=public
GetNextRequest(25)
04:06:36.459782 IP  10.10.10.11.161 > 10.10.10.1.36122 :  C=public
GetResponse(91)  system.sysDescr.0=[|snmp]
04:06:36.764310 IP  10.10.10.1.36122 > 10.10.10.11.161:  C=public
GetNextRequest(28)  system.sysDescr.0
04:06:36.764664 IP 10.10.10.11.161 > 10.10.10.1.36122:  C=public
GetResponse(38)  system.sysObjectID.0=E:8072.3[|snmp]
04:06:37.068358 IP 10.10.10.1.36122 > 10.10.10.11.161:  C=public
GetNextRequest(28)  system.sysObjectID.0
04:06:37.068686 IP 10.10.10.11.161 > 10.10.10.1.36122:  C=public
GetResponse(31)  system.sysUpTime.0=232068
04:06:37.372605 IP 10.10.10.1.36122 > 10.10.10.11.161:  C=public
GetNextRequest(28)  system.sysUpTime.0

etc.

2. Following is the full log of snmpwalk -v2c -c  public 192.168.1.1
-- > From the VPN Server

04:13:32.859163 IP 10.10.10.1.36222 > 192.168.1.1.161:  C=public
GetNextRequest(25)
04:13:32.859563 IP 10.10.10.11.161 > 10.10.10.1.36222:  C=public
GetResponse(91)  system.sysDescr.0=[|snmp]
04:13:33.859700 IP 10.10.10.1.36222 > 192.168.1.1.161:  C=public
GetNextRequest(25)
04:13:33.860097 IP 10.10.10.11.161 > 10.10.10.1.36222:  C=public
GetResponse(91)  system.sysDescr.0=[|snmp]
04:13:34.859747 IP 10.10.10.1.36222 > 192.168.1.1.161:  C=public
GetNextRequest(25)
04:13:34.860160 IP 10.10.10.11.161 > 10.10.10.1.36222:  C=public
GetResponse(91)  system.sysDescr.0=[|snmp]
04:13:35.860531 IP 10.10.10.1.36222 > 192.168.1.1.161:  C=public
GetNextRequest(25)
04:13:35.860949 IP 10.10.10.11.161 > 10.10.10.1.36222:  C=public
GetResponse(91)  system.sysDescr.0=[|snmp]
04:13:36.860572 IP 10.10.10.1.36222 > 192.168.1.1.161:  C=public
GetNextRequest(25)
04:13:36.860988 IP :10.10.10.11.161 > 10.10.10.1.36222  C=public
GetResponse(91)  system.sysDescr.0=[|snmp]
04:13:37.860840 IP 10.10.10.1.36222 > 192.168.1.1.161 :  C=public
GetNextRequest(25)
04:13:37.861252 IP10.10.10.11.161 > 10.10.10.1.36222 :  C=public
GetResponse(91)  system.sysDescr.0=[|snmp]


Is there is any other Configuration I want to do for getting SNMP data
from the LAN IP of the router ? Please help me if somebody have
previous issues like this .

Thanks,

Abhilash.S
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