Looks like, at a network level, Telstra are blocking SNMP queries from the internet to my router.
Does anyone know how I get Telstra to turn that "feature" off?
Specifically - my router is not able to receive any packets on UDP port 161.
My router can accept other incoming queries just fine (like SSH), just UDP 161 is the problem.
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This isnt a remotely helpful answer, nor an accurate one. SNMP is in widespread use across the internet, you could find/replace SNMP with SSH in TA17-156A and the principles would still hold true.
SNMP is widely considered to be a security risk (e.g. https://www.us-cert.gov/ncas/alerts/TA17-156A)and is very often allowed only inside tightly controlled networks, often only on segregated VLANs. So I am not surprised that somewhere on the route to your modem, someone blocks it on their router...
Again, your not being helpful, and your not reading my post. "same principles apply" - lock down SNMP like you would SSH using ACL's, passwords, limited views, etc.
None of this is answering my initial question, your just diverting the discussion because?