host & dig

[Walter]

A previous question to the List on how to get an IP
address from a host speicific URL yielded the helpful
responses of "host" and "dig."  These (seemed to) work
fine.  Well, just now I got a chance to try it out on a tiny
server I have at someone else's house, and on another
network.

I used telnet to connect to 68.204.xxx.xxx
it tells me I've connected to xxx.xxx.204.68.cfl.res.rr.com.
(backwards, right?), then I log in.

After user/pass entry, it says connected from "user-yyyyyyy.cab"
(replaced seemingly random name with "yyyyyyy" in case
it's not transient)

My external IP here is 24.110.nnn.nnn

The issue:

When I use either "host" or "dig" to give me the IP address
from "user-yyyyyyy.cab", they tell me: 208.68.zzz.zzz
(Ping gives the same.)

So, I'm still at a loss, I think, to know the originating IP.
Should a firewall rule blocking 208.68.zzz.zzz actually
operate against 24.110.nnn.nnn?  I'd STILL like to know
the true source IP to be able to connect back to it.

TIA.  Again, please respond directly to me (as well as to the
List) because I'm not subscribed.

Walter