Re: Trace/Ping for a Patted IP

pratik_193 · ‎02-18-2011

Hi All,

I have multiple servers patted behing a single Public IP address. My issue here is that when i try to ping the patted public IP from internet, i get TTL expired in transit, even the trace does not get complete.

Please help me on this.

I am attaching the trace & ping report for the same.

Here 115.112.247.81 is my ISP end Public IP address.

Pinging 115.112.246.26 with 32 bytes of data:

Reply from 115.112.247.81: TTL expired in transit.
Reply from 115.112.247.81: TTL expired in transit.
Reply from 115.112.247.81: TTL expired in transit.
Reply from 115.112.247.81: TTL expired in transit.

tracert 115.112.246.26 -d

Tracing route to 115.112.246.26.static-mumbai.vsnl.net.in [115.112.246.26]
over a maximum of 30 hops:

1    <1 ms    <1 ms     1 ms 172.29.0.4
2    31 ms    44 ms    24 ms 172.29.7.212
3    26 ms    34 ms    55 ms 59.163.54.20
4   348 ms    90 ms   104 ms 59.163.52.134
5   217 ms    97 ms   160 ms 203.197.33.200
6   233 ms   111 ms   164 ms 203.199.125.37
7    83 ms    34 ms    63 ms 115.112.247.81
8    37 ms    29 ms    17 ms 115.112.247.81
9    79 ms   103 ms    38 ms 115.112.247.81
10    70 ms    32 ms    68 ms 115.112.247.81
11   141 ms    85 ms    44 ms 115.112.247.81
12    37 ms    30 ms    47 ms 115.112.247.81
13    98 ms   118 ms    72 ms 115.112.247.81
14   108 ms   146 ms   106 ms 115.112.247.81
15    36 ms    12 ms    18 ms 115.112.247.81
16    15 ms     6 ms    10 ms 115.112.247.81
17    31 ms     8 ms     7 ms 115.112.247.81

Thanks

Pratik

mirober2 · ‎02-18-2011

Hi Pratik,

That would indicate that the packets are bouncing back and forth between 115.112.247.81 and another device.

What does the routing table on 115.112.247.81 look like for 115.112.246.26? Whichever device it points to is probably pointing right back to
115.112.247.81. You'll want to take a look at the routing on these devices and make sure there are no loops.

Hope that helps.

-Mike

pratik_193 · ‎02-18-2011

HI mike,

We are having /24 subnet of ip address ie 115.112.246.1/24 which we suppose is the routing table on 115.112.247.81.

I am doubting that will ICMP & tracert work for any IP that is Patted on ASA?

Thanks

Pratik