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Want to know your remote SQL server's IP addres, without all the NAT that's in between you two?

create table #ipconfig (results varchar(250) null)

insert into #ipconfig 
exec xp_cmdshell 'ipconfig'

SELECT REPLACE(SUBSTRING(results,CHARINDEX(':',results,1)+1,LEN(results)),' ','') 
from #ipconfig
where results like '%IP Address%'

Outputs the IP address of the server, locally.