Hi,
This is not at all problem with your end or TATA Communication. Since
you are using IP range of 192.168.7.1-192.168.7.253, your subnet mask is
255.255.255.0
This means, any IP outside your range will be forwarded to your router
(192.168.7.51). Now since router is configured to pass traffic on
115.115.147.137, this request is sent on public network. THis is normal.
Now this will continue till IP 192.168.2.10 is reached. Every G/W in
path will try to reach this IP and keeps forwarding requests to
subsequent G/W of the router / L3 switch.
There are guidelines to define IP addresses. Where as it all depends on
routes defined in router. TATA Communication has very little control on
this. It is problem with last mile router. Their route configuration
seems to be incorrect.
On the other hand, if you want to drop such traffic, you should
configure appropriate Deny rule in your router.
Thanks & Regards,
Amit Patkar
On 10/9/2012 1:27 PM, 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.
I have already reported it to TATA Communication Ltd. They give us commitment
to solve it by 24hour.
Have anyone see this before?
---
[Nirmalya Lahiri]
+ - [+91-9433113536]
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