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I need some help on configuring SNMP for Juniper EX4500 ethernet switch. I am performing this command:

host1:~# snmpwalk -v 2c -c my_community_string .1
Timeout: No Response from

where - switch's external IP address.

From the host1 I am able to connect to other switch's ports such as 22.

SNMP agent looks to be running:

juniper> show system processes extensive | match snmp 
 2101 root         1  96    0 18860K 14628K select   0:06  0.00% snmpd

Also, I am able to query from the switch:

juniper> show snmp mib get 
ifHCInOctets.524 = 1200002682732106

SNMP configuration:

juniper> show configuration snmp 
location Switch;
community my_community_string {
    clients {;

where - a host I'm connecting from

I would appreciate any help as I just lost in documentation and afraid to break something.

Thank you.

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Are you sure you are not NATting the connection towards that device ? – Gabor Vincze Mar 12 '13 at 16:43
Sorry, my knowledge is very basic in this area. Could you tell me how to check on that? – Andrew Mar 12 '13 at 16:57
I mean, is there an other network device between your snmp client and your Juniper stuff ? If yes, does it make NAT between the two network accidentally ? – Gabor Vincze Mar 12 '13 at 17:21

2 Answers 2

you're missing the authorization statement... set snmp community my_community_string authorization read-only

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also, try "system" in your SNMPwalk instead of just .1 – SpacemanSpiff Mar 13 '13 at 15:18
Thank you, it's important to set it read-only but that didn't help to resolve the issue. – Andrew Mar 14 '13 at 16:49

To resolve this issue, I started to monitor switch by connecting to an internal IP address. I took it from the following configuration section:

unit 10 {        
    family inet {             
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