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Host unreachable, from home network only

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Host unreachable, from home network only

Hi, I'm seeing a routing problem to a specific external host, www.clarknaddison.com (74.95.134.237).  I'm unable to see any traffic to this address from my home xfinity network, but I can from other locations outside.  For example, I can tether my laptop to an AT&T phone and load that page without problems.  I have so far not seen problems with any other web sites, but I believe this to be an issue with comcast routing.

 

A sample traceroute from my house:

 

$ traceroute www.clarknaddison.com
traceroute to www.clarknaddison.com (74.95.134.237), 64 hops max, 52 byte packets
 1  192.168.1.1 (192.168.1.1)  1.614 ms  5.889 ms  9.243 ms
 2  10.0.0.1 (10.0.0.1)  146.458 ms
    96.120.28.5 (96.120.28.5)  17.909 ms  20.951 ms
 3  be132-rur02.wchicago.il.chicago.comcast.net (96.108.112.197)  160.739 ms  27.194 ms  149.986 ms
 4  be-124-ar01.area4.il.chicago.comcast.net (162.151.45.109)  22.390 ms  31.303 ms *
 5  69.139.202.57 (69.139.202.57)  28.380 ms  21.709 ms  20.076 ms
 6  69.139.173.90 (69.139.173.90)  19.630 ms  29.523 ms  29.950 ms
 7  * * *

 

And one while tethered to the phone:

 

$ traceroute www.clarknaddison.com
traceroute to www.clarknaddison.com (74.95.134.237), 64 hops max, 52 byte packets
 1  192.168.43.1 (192.168.43.1)  8.521 ms  13.563 ms  8.406 ms
 2  172.26.96.161 (172.26.96.161)  45.618 ms  60.731 ms  32.252 ms
 3  107.79.236.252 (107.79.236.252)  32.538 ms  51.873 ms  52.079 ms
 4  12.83.186.161 (12.83.186.161)  45.034 ms  46.387 ms  55.447 ms
 5  12.83.186.145 (12.83.186.145)  64.676 ms  127.541 ms  132.374 ms
 6  cgcil403igs.ip.att.net (12.122.133.33)  52.439 ms  40.042 ms  34.430 ms
 7  192.205.37.22 (192.205.37.22)  159.277 ms  45.832 ms  58.064 ms
 8  be-2304-cs03.350ecermak.il.ibone.comcast.net (96.110.37.41)  32.411 ms
    be-2404-cs04.350ecermak.il.ibone.comcast.net (96.110.37.45)  49.177 ms  47.272 ms
 9  96.110.40.58 (96.110.40.58)  38.211 ms
    96.110.40.62 (96.110.40.62)  54.880 ms
    96.110.40.58 (96.110.40.58)  53.823 ms
10  69.139.202.57 (69.139.202.57)  49.044 ms  42.682 ms  50.372 ms
11  69.139.173.90 (69.139.173.90)  48.642 ms  45.747 ms  193.294 ms
12  * * *

it appears that the difference is the routing through the intermediate ibone/chicago.comcast.net switches.  Can anyone help me resolve this, or point me to the right place to escalate this?

 

Thanks!

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Gold Problem Solver

Re: Host unreachable, from home network only

I can reach the site. When one customer cannot reach a site but others can, it may mean the site is blocking that customer's public Comcast IP. You can look up your IP at https://www.google.com/search?q=what+is+my+IP.

My trace from South-Central PA looks like:

C>tracert -4 www.clarknaddison.com
Tracing route to www.clarknaddison.com [74.95.134.237] over a maximum of 30 hops:
  1    15 ms     4 ms     7 ms  router1 [192.168.1.1]
  2    16 ms    11 ms    11 ms  96.120.9.181
  3    15 ms    11 ms    11 ms  24.124.216.181
  4    12 ms    12 ms    11 ms  96.110.24.214
  5    14 ms    13 ms    22 ms  96.110.25.65
  6    21 ms    22 ms    20 ms  69.139.168.141
  7    23 ms    24 ms    22 ms  96.110.42.165
  8    27 ms    28 ms    26 ms  be-1212-cr12.pittsburgh.pa.ibone.comcast.net [96.110.38.150]
  9    38 ms    32 ms    32 ms  be-301-cr14.350ecermak.il.ibone.comcast.net [96.110.39.157]
 10    37 ms     *       35 ms  be-1314-cs03.350ecermak.il.ibone.comcast.net [96.110.35.57]
 11    37 ms    37 ms    36 ms  96.110.40.58
 12    37 ms    36 ms    36 ms  69.139.202.57
 13    42 ms     *       34 ms  69.139.173.90
 14     *        *        *     Request timed out.
 15    55 ms    55 ms    69 ms  mx.clarknaddison.com [74.95.134.237]
Trace complete.

Note that my trace reaches one hop past where yours appears to die, which can mean that the target site or its webhost are blocking you.

Are you using a Comcast gateway device with their buggy "xFi Security" enabled?