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Source IP Filtering? How do I not use Cogent? #42

Closed online-stuff closed 2 years ago

online-stuff commented 2 years ago

Does Neptune Networks filter source IPs? Having an odd issue when using a VPN connections with 'use-default-route'.. Wondering if source-IP-filtering could be the cause.

Secondly, and this is probably a 'silly' question, how do I use BGP to prevent Cogent from being used upstream?

bswinnerton commented 2 years ago

👋 Hi @online-stuff,

Does Neptune Networks filter source IPs? Having an odd issue when using a VPN connections with 'use-default-route'.. Wondering if source-IP-filtering could be the cause.

Neptune does filter source IPs. For IPv4, the only allowed address is the one assigned to your virtual machine. For IPv6, any address in the /64 is allowed. We do this to prevent address spoofing on the platform.

Secondly, and this is probably a 'silly' question, how do I use BGP to prevent Cogent from being used upstream?

You can do this using the BGP communities listed on our Peering Page. Specifically for Cogent, you should be able to tag your announced prefixes with 21700:666:174 to prevent the prefixes from being announced to them.