Today i visit to my friend location and i found something which was quite interesting to me and i want to know how it happends? he is using webproxy? or what?
It may happend, because TTL value was change in 10.10.10.1 . For better understanding, look at this (how traceroute works): http://en.wikipedia.org/wiki/Traceroute
he is not telling 10.10.10.1 is ip of yahoo
rather he indicated ip of yahoo to be 87.248.122.122 (belongs to Yahoo Europe region)
and asking why in trace it did not showed the ip of ADSL router 192.168.1.1 probable the config is
Internet >> ADSL(192.168.1.1) >> Mikrotik(10.10.10.1) >> User
what i guess is the ADSL router is in Bridge mode so it will not show in trace