On Tuesday 09 Oct 2012, Nirmalya Lahiri wrote: > Hi everyone, > today I have discover a critical network infrastructure which is > almost impossible. I believe very few people have seen this before. > > The story is .... in my office we have leased internet connection > with static IP from TATA Communication Ltd. In my local network I > have configured network ip (192.168.7.0). So all the PC in my local > network has the IP of the range 192.168.7.1 to 192.168.7.253. > > For a experimental purpose yesterday I have ping to 192.168.2.10... > It should not return reply. But unfortunately I got reply from a > host. After investigation I have found that the host is outside of > my local network. Please look into the tracepath report from my > local PC to that unknown host. > > nirmalya@nirmalya-desktop:~$ tracepath 192.168.2.10 > 1: nirmalya-desktop.local (192.168.7.103) 0.141ms > pmtu 1500 1: 192.168.7.51 (192.168.7.51) > 0.706ms 1: 192.168.7.51 (192.168.7.51) > 0.700ms 2: 115.115.147.137 (115.115.147.137) > 150.228ms 3: 121.240.2.54 (121.240.2.54) > 188.099ms asymm 6 4: 121.240.2.57 (121.240.2.57) > 175.322ms asymm 6 5: 172.25.81.133 (172.25.81.133) > 176.625ms asymm 6 6: 172.29.253.34 > (172.29.253.34) 208.708ms asymm 8 7: > 172.31.16.193 (172.31.16.193) 186.462ms > asymm 8 8: 172.31.35.138 (172.31.35.138) > 206.554ms asymm 10 9: 172.31.8.134 (172.31.8.134) > 226.454ms asymm 10 10: 172.25.82.62 (172.25.82.62) > 206.389ms asymm 9 11: 192.168.2.10 (192.168.2.10) > 217.967ms reached Resume: pmtu 1500 hops 11 > back 247 > > > In this report 192.168.7.103 is my personal PC, 192.168.7.51 is > internal IP of router, 115.115.147.137 is gateway IP of our leased > internet connection.
Have seen this issue with other providers also. They use RCF1918 IPs in their internal network infrastructure. However, they don't protect that infrastructure adequately from external access. Not really an issue, unless the service provider believes that internal IPs are making that portion of the infrastructure secure, and become lax. Or if they start advertising those IPs on the 'net! Regards, -- Raj -- Raj Mathur || [email protected] || GPG: http://otheronepercent.blogspot.com || http://kandalaya.org || CC68 It is the mind that moves || http://schizoid.in || D17F _______________________________________________ Ilugd mailing list [email protected] http://frodo.hserus.net/mailman/listinfo/ilugd
