Question on tracert/traceroute

I cannot access telehouse.net on my mac but I can on my windows laptop.
Both using the same internet connection.
I have done a tracert on the windows pc and a traceroute on the mac to telehouse.net and there are differences which I am hoping may indicate the nature of the problem.
But I cannot understand why the trace routes would be different ?
Does anyone know ?

Could you post both the traceroutes as I don't want to guess?

Windows trace :
Tracing route to telehouse.net [85.90.40.37]
over a maximum of 30 hops:

1 1 ms <1 ms <1 ms BThomehub.home [192.168.1.254]
2 * * * Request timed out.
3 * * * Request timed out.
4 9 ms 8 ms 8 ms 31.55.187.184
5 8 ms 8 ms 8 ms core1-hu0-8-0-5.southbank.ukcore.bt.net [195.99.127.178]
6 9 ms 8 ms 9 ms 62.172.103.23
7 7 ms 7 ms 7 ms 166-49-211-230.eu.bt.net [166.49.211.230]
8 9 ms 9 ms 9 ms 166-49-211-38.eu.bt.net [166.49.211.38]
9 16 ms 16 ms 25 ms telehouse-gw.ip4.gtt.net [77.67.90.6]
10 17 ms 16 ms 16 ms TELECLOUD.US.COM [85.90.40.37]
11 17 ms 17 ms 17 ms TELECLOUD.US.COM [85.90.40.37]

Trace complete.


Mac trace :
traceroute to telehouse.net (85.90.40.37), 64 hops max, 52 byte packets
1 192.168.1.254 (192.168.1.254) 1.083 ms 0.867 ms 0.817 ms
2 * * *
3 * * *
4 31.55.187.184 (31.55.187.184) 9.292 ms 9.043 ms 9.013 ms
5 core2-hu0-0-0-1.southbank.ukcore.bt.net (195.99.127.168) 9.445 ms
core2-hu0-10-0-0.southbank.ukcore.bt.net (195.99.127.170) 8.300 ms
core2-hu0-8-0-1.southbank.ukcore.bt.net (195.99.127.184) 8.146 ms
6 213.121.193.207 (213.121.193.207) 8.736 ms 8.387 ms 8.954 ms
7 t2c3-et-3-3-0-0.uk-lon1.eu.bt.net (166.49.211.238) 8.033 ms
166-49-211-228.eu.bt.net (166.49.211.228) 8.778 ms 8.904 ms
8 166-49-211-38.eu.bt.net (166.49.211.38) 9.193 ms 9.225 ms 9.774 ms
9 telehouse-gw.ip4.gtt.net (77.67.90.6) 17.020 ms 17.131 ms 17.170 ms
10 www.telecloud.eu.com (85.90.40.37) 16.743 ms 16.384 ms 17.419 ms
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * *^C

The mac trace never completes.

Just an extra quick bit of info.
I can't access telehouse.net on my Chromebook or iPhone either.
So the Windows laptop is the only device so far that works.

Windows and OS X use different protocols for traceroute. Windows uses ICMP and OS X uses UDP by default.

If you use your Mac's traceoute with ICMP by using the -I option the results are identical;

macchiato:~ sarah$ traceroute -I 85.90.40.37
traceroute to 85.90.40.37 (85.90.40.37), 64 hops max, 72 byte packets
 1  10.18.2.2 (10.18.2.2)  1.974 ms  1.032 ms  0.857 ms
 2  losubs.subs.bng2.th-lon.zen.net.uk (62.3.80.21)  8.937 ms  9.274 ms  9.411 ms
 3  ae1-182.cr1.th-lon.zen.net.uk (62.3.86.80)  9.042 ms  9.216 ms  8.971 ms
 4  ge-3-3-0.mpr1.lhr3.uk.above.net (195.66.236.76)  9.048 ms  9.732 ms  11.012 ms
 5  reserved.above.net (213.152.231.188)  9.541 ms  9.608 ms  9.353 ms
 6  telecloud.org (85.90.40.37)  9.618 ms  9.761 ms  9.561 ms
 7  telecloud.org (85.90.40.37)  9.846 ms  9.629 ms  9.679 ms

and note that whichever the Mac uses, it still gets to the same final reply address - 85.90.40.37, so you do reach it. It's just that telehouse.net responds differently to ICMP and UDP traceoutes, which is perfectly reasonable.

Edited by caffn8me (Mon 25-Jul-16 19:28:40)

Do you have different DNS servers assigned to the Mac and PC ?

Both Mac and Windoze resolve the address as 85.90.40.37

Thanks Sarah - that is very interesting info.
The traceroute with the -I option works on my mac also.
So I am confused why the mac cannot access telehouse.net website.

I thought that but then the PTR for the IP has more than one record meaning the traceroute name would appear different but that does not matter as the IP is the same.

:~ mattm$ host 85.90.40.37
37.40.90.85.in-addr.arpa domain name pointer www.telehouse.co.uk.
37.40.90.85.in-addr.arpa domain name pointer www.telehouse.net.
37.40.90.85.in-addr.arpa domain name pointer TELECLOUD.DE.COM.
37.40.90.85.in-addr.arpa domain name pointer telecloud.eu.COM.
37.40.90.85.in-addr.arpa domain name pointer TELECLOUD.US.COM.
37.40.90.85.in-addr.arpa domain name pointer TELECLOUD.ORG.
37.40.90.85.in-addr.arpa domain name pointer telehouse.co.uk.
37.40.90.85.in-addr.arpa domain name pointer de.telehouse.net.
37.40.90.85.in-addr.arpa domain name pointer www.TELECLOUD.DE.COM.
37.40.90.85.in-addr.arpa domain name pointer www.telecloud.eu.COM.
37.40.90.85.in-addr.arpa domain name pointer www.TELECLOUD.US.COM.
37.40.90.85.in-addr.arpa domain name pointer www.TELECLOUD.ORG.

Matt

Batboy- I have tried different DNS servers on the mac - makes no difference.
As Sarah said they all resolved to the same IP address.