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routing from isp

carl_townshend
Frequent Contributor
Frequent Contributor

When the isp routes to my router, do they just route a particular block of ip addresses to the external ip of my router, I gather your router would not be on the same block as the ip range they are routing to you ?

thanks

Carl

2 Replies 2

atif.awan
Participant
Participant

What you have described is indeed the usual case.

Normally the point-to-point link between a customer's router and the provider's router is addressed out of a separate /30 address space. In addition to this /30 subnet the customer is also assigned another block of addresses that are routed by the provider to the external IP Address of the customer's router. If a customer requires more addresses in the future the customer just requests for them and the ISP routes them to the same external IP Address (one of the two /30 addresses)

thanks

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