KB ID 0000706
I was working on an SRX100B Firewall yesterday, and needed to be able to ping the outside interface.
Note: You can quickly enable ping on a physical interface from CLI like so;
1. Log into the web console of the Juniper.
2. Navigate to Security > Zones/Screen > Select the ‘Untrust’ Zone > Edit > Host inbound traffic – Interface > Under Interface services add in ‘ping’ > OK.
Note: To allow pinging of the inside interface select the trusted zone.
3. Then to save the change click Action > Commit.
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Original Article Written 07/11/12