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When I test my connection on services such as whatsmyip.com, I get 112.134.xx.xx as my public address. When I check the ADSL connection status on my router, it shows a totally different IP address (100.74.xx.xx) as my public address. When I ping (or ssh) both of the above IP addresses, only the latter works.

Lookups on the above IP address shows that 112.134.xx.xx actually belongs to my ISP, and 100.74.xx.xx is a bogon.

I'm trying to setup a dynamic DNS update client and it's catching 112.134.xx.xx as my IP address, which doesn't work. Any idea what's happening here? My router is a D-Link DSL-2730U.

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You do not have a public IP address. The 100.64/10 address space is reserved for ISPs’ NATs (as opposed to 10/8, 172.16/12 and 192.168/16 which are available for the end user), and is not globally routable.

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