I'm facing a weird problem at home and have been trying to find the root cause of the following problem, and solve it. I have a Motorola router at home and its public IP is 104.32.170.156
(taken from www.whatismyip.com). The problem is that this public IP cannot be reached from outside my network via ping
/ traceroute
utilities. I have a remote server which has an IP 204.57.3.217
, and I'm able to reach this one from my local machine - all outgoing ICMP Ping
and traceroutes
from my network succeed.
As a side note, my internet works just fine. I am also able to SSH
from and from the remote server to my machine and vice-versa. But I'm wondering why ICMP ping
and/or traceroute
wouldn't be successful to my network.
Please note: I turned off firewall
both on my laptop and on the router/modem I'm connected to, and rebooted the Router after applying this change. I had not changed any other setting in the Router - have left them to default, as everything seemed fine to me.
Given that the firewall
has been disabled, I believe the Router wouldn't filter ICMP
messages any more.
Traceroute from my local machine (104.32.170.156
) to remote server (204.57.3.217
):
traceroute to 204.57.3.217 (204.57.3.217), 64 hops max, 52 byte packets
1 192.168.0.1 (192.168.0.1) 23.405 ms 0.993 ms 1.166 ms
2 cpe-104-32-160-1.socal.res.rr.com (104.32.160.1) 9.642 ms 10.100 ms 8.505 ms
3 tge0-9-0-18.lsajcatj01h.socal.rr.com (76.167.30.177) 10.003 ms 11.092 ms 11.227 ms
4 agg22.lsaicaev01r.socal.rr.com (72.129.18.86) 12.994 ms 16.208 ms 11.410 ms
5 agg26.lsancarc01r.socal.rr.com (72.129.17.0) 15.365 ms 14.306 ms 19.079 ms
6 bu-ether16.lsancarc0yw-bcr00.tbone.rr.com (66.109.6.102) 15.035 ms 15.378 ms 18.354 ms
7 0.ae0.pr1.lax00.tbone.rr.com (107.14.17.248) 13.144 ms 0.ae1.pr1.lax00.tbone.rr.com (107.14.17.250) 12.562 ms 0.ae0.pr1.lax00.tbone.rr.com (107.14.17.248) 12.725 ms
8 v217.core1.lax2.he.net (216.218.223.233) 70.217 ms 57.818 ms 49.854 ms
9 216.218.223.28 (216.218.223.28) 13.922 ms
216.218.223.26 (216.218.223.26) 17.041 ms 27.590 ms
10 130.152.182.83 (130.152.182.83) 16.196 ms 16.301 ms 14.347 ms
11 fw6-rtr-border-cal.usc.edu (128.125.251.227) 13.323 ms 14.346 ms
13.355 ms
12 fw6-rtr-border-cal.usc.edu (128.125.251.227) 13.990 ms 15.406 ms 14.409 ms
13 rtr6-fw6.usc.edu (128.125.255.146) 14.413 ms 15.327 ms 14.156 ms
14 rtr30-v255.usc.edu (128.125.251.148) 44.621 ms 44.625 ms
catarina.usc.edu (204.57.0.1) 20.688 ms
15 204.57.3.217 (204.57.3.217) 15.020 ms 14.390 ms 14.275 ms
Traceroute from remote server (204.57.3.217
) to my local machine (104.32.170.156
) fails:
traceroute -I 104.32.170.156
traceroute to 104.32.170.156 (104.32.170.156), 30 hops max, 60 byte packets
1 204.57.3.254 (204.57.3.254) 5.063 ms 5.299 ms 5.453 ms
2 rumi.usc.edu (204.57.0.2) 0.501 ms 0.610 ms 0.672 ms
3 v255-gw-6.usc.edu (128.125.251.149) 0.429 ms 0.500 ms 0.587 ms
4 fw6-rtr6.usc.edu (128.125.255.147) 0.222 ms 0.215 ms 0.180 ms
5 rtr-border-cal-fw6.usc.edu (128.125.251.226) 0.705 ms 0.732 ms 0.782 ms
6 ln-usc1-pwaveusc2042.ln.net (130.152.182.81) 1.020 ms 0.816 ms 0.825 ms
7 d3-0-1-2.a05.nycmny01.us.ra.gin.ntt.net (165.254.21.241) 2.340 ms 2.500 ms 2.585 ms
8 ix-5-0.tcore2.LVW-Los-Angeles.as6453.net (64.86.252.133) 10.706 ms 10.720 ms 10.731 ms
9 64.86.252.130 (64.86.252.130) 0.629 ms 0.629 ms 0.617 ms
10 bu-ether21.lsancarc0yw-bcr00.tbone.rr.com (107.14.19.139) 4.081 ms 3.811 ms 3.804 ms
11 ae3.lsanca4-rtr1.socal.rr.com (66.109.6.103) 6.551 ms 6.366 ms 6.274 ms
12 agg1.lsaicaev01r.socal.rr.com (72.129.17.1) 7.505 ms 6.291 ms 6.006 ms
13 agg1.lsajcatj01h.socal.rr.com (72.129.18.87) 5.790 ms 5.705 ms 5.727 ms
14 tge7-1.lsajcatj02m.socal.rr.com (76.167.30.190) 6.308 ms 6.330 ms 6.373 ms
15 * * *
16 * * *
17 * * *
Looking at both the traceroute
outputs, it looks like traceroute
to my public IP from the remote server (second case) breaks at / before my network.
I also ran tcpdump
to capture all ICMP
messages from my local machine to my IP, but I don't see any.
Does anyone have an idea why this is happening / how to resolve this? Thanks!