Snmpwalk through ER7206 router

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Snmpwalk through ER7206 router

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Snmpwalk through ER7206 router
Snmpwalk through ER7206 router
2022-09-26 18:44:04 - last edited 2022-12-12 17:10:13
Model: ER7206 (TL-ER7206)  
Hardware Version: V1
Firmware Version: 1.2.0

I have a set of bridges between the AT&T connection and my ER7206 router.  I can reach to bridges (HTTPS) and from the outside network I can snmpwalk the bridges, but timeout when trying to walk from my inside network.  Is there something in the config I need to set to get the snmpwalk to be allowed?

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#1
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Re:Snmpwalk through ER7206 router-Solution
2022-09-29 12:29:29 - last edited 2022-12-12 17:10:13

  @Somnus Problem solved.  It is a stupid operator issue!!!   I forgot that those bridges are snmp V 1 only not V 2c.   

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Re:Snmpwalk through ER7206 router
2022-09-27 07:14:05

  @MikeW1 

What is that "bridges"? Is that a web server in your local network?

DId you open port for the server IP?

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Re:Snmpwalk through ER7206 router
2022-09-27 23:04:23

  @Somnus it is a pair of Ubiquiti Powerbeams.   If I am on their network it can be walked.  they can be pinged, http/https allows access to all information.  There are no restrictions on the bridge restricting the walk and I have used snmpwalk when I had another router in place.  Because this is production I do not want to disrupt too much, but may have to place a switch outside to be able to get a wireshark trace of the traffic.  since it is UDP traffic, I was wondering if I needed something to allow the inbound response but do not find any information as to how that might be checked.

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Re:Snmpwalk through ER7206 router
2022-09-28 04:58:06

  @MikeW1 

 

You may check the WAN IP address of the ER7206, is that on the same subnet as your Ubiquiti Powerbeams?

 

The "bridge" is on the WAN side of the ER7206, so the router can only communicate with it via the WAN IP.

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Re:Snmpwalk through ER7206 router
2022-09-28 13:17:06

  @Somnus to get specific:

my ER7206 LAN 172.27.0.1     WAN 192.168.5.54

Bridges are 192.168.5.51 and 192.168.5.50

Router before At&T  192.168.5.1 (and I do not have access to this router)

from 172.27.0.245 I can ping 192.168.5.1, .50, .51 and can https to .50, . 51

from 192.168.5.53 I can snmpwalk for .50 and .51

from 172.27.0.245 snmpwalk times out.  the Ubiquiti bridges will accept snmp from any source.

to put a switch in the link so I can get a wireshark capture to see if packets are getting out will be disruptive and 

right now even a 20 minute down  time would be hard to get.

 

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#5
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Re:Snmpwalk through ER7206 router
2022-09-29 04:07:35

  @MikeW1 

 

If your ER7206 is running on Standalone mode, then you can use one LAN port as mirror port, and capture the packets from router WAN port. Guide

 

I suspect SNMP packets cannot go through ER7206 NAT.

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#6
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Re:Snmpwalk through ER7206 router-Solution
2022-09-29 12:29:29 - last edited 2022-12-12 17:10:13

  @Somnus Problem solved.  It is a stupid operator issue!!!   I forgot that those bridges are snmp V 1 only not V 2c.   

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#7
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