[CentOS] 2 questions on CentOS firewall
Timothy Murphy
gayleard at eircom.net
Wed Jul 20 20:41:46 UTC 2011
Timothy Murphy wrote:
> So I assume the modem is rejecting the ICMP packets.
> As I said, I don't see anything about this
> in the modem documentation or on the modem web-site.
I suppose another possibility is that some site along the way
rejects ICMP packets?
traceroute seems to timeout in Milan:
-----------------------------------
[root at helen tim]# traceroute anghiari.homelinux.com
traceroute to anghiari.homelinux.com (79.46.6.203), 30 hops max, 40 byte
packets
1 netopia (192.168.1.254) 0.951 ms 1.132 ms 1.389 ms
2 isp (159.134.155.19) 37.238 ms 39.560 ms 42.027 ms
...
12 telecomitalia.par02.atlas.cogentco.com (130.117.14.82) 67.140 ms
telecomitalia.par02.atlas.cogentco.com (130.117.15.138) 92.952 ms ibs-
resid.milano50.mil.seabone.net (93.186.128.246) 87.098 ms
13 * * *
...
30 * * *
-----------------------------------
tcptraceroute gets to the modem, but after some timeouts:
-----------------------------------
[root at helen tim]# tcptraceroute anghiari.homelinux.com
traceroute to anghiari.homelinux.com (79.46.6.203), 30 hops max, 40 byte
packets
1 netopia (192.168.1.254) 1.491 ms 1.534 ms 1.784 ms
2 isp (159.134.155.19) 36.195 ms 38.794 ms 41.328 ms
...
12 ibs-resid.milano50.mil.seabone.net (93.186.128.246) 85.084 ms 84.599
ms 86.881 ms
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 host203-6-dynamic.46-79-r.retail.telecomitalia.it (79.46.6.203) 115.381
ms 107.416 ms 114.875 ms
-----------------------------------
If anyone can interpret these for me, I shall be grateful.
--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland
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