Do Some Gateways Block Certain Sites?
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- Re: Do Some Gateways Block Certain Sites?
Do Some Gateways Block Certain Sites?
27-04-2012 5:43 PM
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I can't help noticing that sometimes it appears that a site is down but when you check, say on a place like "website down" it often says it isn't.
For instance today I've been unable to access the filefactory website. No problem with the internet in general. So I disconnect the internet connection and re-connect (to pcl-ag06 apparently) and now filefactory pops up as fast as any other page.
So the question is are all gateways equal?
Re: Do Some Gateways Block Certain Sites?
27-04-2012 5:47 PM
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Re: Do Some Gateways Block Certain Sites?
28-04-2012 1:11 AM
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Re: Do Some Gateways Block Certain Sites?
28-04-2012 1:57 AM
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It won't be a case of some gateways blocking certain websites, but I still suspect some sort of DNS issue with some gateways.
Re: Do Some Gateways Block Certain Sites?
28-04-2012 2:10 AM
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Re: Do Some Gateways Block Certain Sites?
28-04-2012 8:12 AM
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Regular traceroute:
traceroute filefactory.com
traceroute to filefactory.com (85.17.172.100), 30 hops max, 60 byte packets
1 192.168.0.1 (192.168.0.1) 4.027 ms 5.315 ms 5.783 ms
2 lo0-central1.pcl-ag01.plus.net (195.166.128.232) 30.492 ms 31.797 ms 33.454 ms
3 gi1-8-112.pcl-gw02.plus.net (84.92.6.2) 108.756 ms 111.283 ms 111.755 ms
4 tun0.pcl-gw01.plus.net (212.159.2.105) 112.778 ms 113.348 ms 113.831 ms
5 flowers2.servers.plus.net.uk (212.159.2.98) 41.100 ms 42.444 ms 44.364 ms
6 xe-11-1-0.edge3.London2.Level3.net (212.187.201.209) 47.135 ms 44.367 ms 45.498 ms
7 ae-0-11.edge4.London2.Level3.net (4.69.200.126) 46.516 ms 20.900 ms 22.186 ms
8 ae-3-3.ebr1.London1.Level3.net (4.69.141.189) 24.717 ms 26.064 ms 28.763 ms
9 vlan103.ebr2.London1.Level3.net (4.69.143.94) 31.224 ms vlan101.ebr2.London1.Level3.net (4.69.143.86) 32.420 ms 34.169 ms
10 ae-47-47.ebr2.Amsterdam1.Level3.net (4.69.143.77) 46.159 ms 48.242 ms ae-46-46.ebr2.Amsterdam1.Level3.net (4.69.143.73) 28.536 ms
11 ae-57-222.csw2.Amsterdam1.Level3.net (4.69.153.206) 36.883 ms ae-56-221.csw2.Amsterdam1.Level3.net (4.69.153.202) 31.209 ms ae-59-224.csw2.Amsterdam1.Level3.net (4.69.153.214) 33.686 ms
12 4.69.162.158 (4.69.162.158) 31.264 ms 4.69.162.146 (4.69.162.146) 30.731 ms 30.009 ms
13 FIBERRING-B.edge5.Amsterdam1.Level3.net (212.72.41.142) 34.158 ms 35.052 ms 27.881 ms
14 po100.hv1.evo.leaseweb.net (85.17.100.222) 33.509 ms 36.741 ms 37.242 ms
15 85.17.172.100 (85.17.172.100) 37.669 ms 38.093 ms 39.476 ms
Suspiciously short traceroute using TCP to port 80 (HTTP):
traceroute -T -p 80 www.filefactory.com
traceroute to www.filefactory.com (85.17.172.100), 30 hops max, 60 byte packets
1 192.168.0.1 (192.168.0.1) 2.355 ms 4.228 ms 6.017 ms
2 lo0-central1.pcl-ag01.plus.net (195.166.128.232) 23.530 ms 24.631 ms 28.085 ms
3 gi1-8-112.pcl-gw02.plus.net (84.92.6.2) 30.647 ms 31.084 ms 31.644 ms
4 tun0.pcl-gw01.plus.net (212.159.2.105) 33.942 ms 35.752 ms 37.074 ms
5 85.17.172.100 (85.17.172.100) 38.971 ms 41.510 ms 43.925 ms
Re: Do Some Gateways Block Certain Sites?
28-04-2012 6:15 PM
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jelv (a.k.a Spoon Whittler) Why I have left Plusnet (warning: long post!) Broadband: Andrews & Arnold Home::1 (FTTC 80/20) Line rental: Pulse 8 Home Line Rental (£14.40/month) Mobile: iD mobile (£4/month) |
Re: Do Some Gateways Block Certain Sites?
28-04-2012 6:26 PM
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I must admit my suggestion about DNS was a bit of a wild one, only because of DNS issues I do see from time to time with PN. Must get round to putting Open DNS into the system which leads me onto another point.
RPM don't Open DNS not look up certain sites (eg. the type of site on IWF's lists)? I don't know, only something that was implied on another thread.
Re: Do Some Gateways Block Certain Sites?
28-04-2012 8:31 PM
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After a internet reconnect the problem disappeared. Maybe a coincidence? But then the FF problem surfaced.
I'm using Plusnets usual DNS. I have used Open DNS back in the days of dial-up but I wouldn't use it now as I think it's too messed about with especially now considering the American stance on all things internet.
Re: Do Some Gateways Block Certain Sites?
28-04-2012 9:03 PM
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Quote from: Anotherone RPM, don't Open DNS not look up certain sites (eg. the type of site on IWF's lists)? I don't know, only something that was implied on another thread.
Open DNS certainly has a filtering system but if anything is blocked it will show a page that says that domain is not allowed. I've not seen any blocking that simply times out.
As a DNS solution OpenDNS is less likely to be 'messed around' by the US gov. compared to traditional ISP DNS services. But that's just my opinion.
Re: Do Some Gateways Block Certain Sites?
28-04-2012 10:14 PM
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jelv (a.k.a Spoon Whittler) Why I have left Plusnet (warning: long post!) Broadband: Andrews & Arnold Home::1 (FTTC 80/20) Line rental: Pulse 8 Home Line Rental (£14.40/month) Mobile: iD mobile (£4/month) |
Re: Do Some Gateways Block Certain Sites?
28-04-2012 11:08 PM
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My current second choice (after OpenDNS) is Norton DNS. It is faster and more reliable than Google DNS, and way faster than Plusnet DNS.
https://dns.norton.com/dnsweb/dnsForHome.do
http://en.wikipedia.org/wiki/Norton_DNS
The "Level 3" DNS addresses (listed by Jelv) are very fast, but frequently one or more of those listed seem to randomly get temporarily overloaded, so if you are unlucky enough to have specified one in your DNS settings that has gone slow, then you might experience variable results. Fortunately this does not effect my network, as my home built local DNS server will send multiple simultaneous upstream lookup requests (to a list of different DNS servers) and only use the fastest valid reply to update it's cache - so if the odd "Level 3" DNS is temporarily unresponsive, then my server will use the fastest result from one of the others and ignore the slower responses.
Re: Do Some Gateways Block Certain Sites?
28-04-2012 11:27 PM
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C:\Users\John>tracert 4.2.2.1
Tracing route to vnsc-pri.sys.gtei.net [4.2.2.1]
over a maximum of 30 hops:
1 1 ms 1 ms 1 ms dg834 [192.168.0.1]
2 15 ms 15 ms 14 ms lo0-central3.pcl-ag03.plus.net [195.166.128.240]
3 173 ms 14 ms 14 ms gi1-7-331.pcl-gw01.plus.net [84.92.6.80]
4 13 ms 14 ms 13 ms ae3.pcl-cr01.plus.net [195.166.129.40]
5 15 ms 26 ms 13 ms xe-11-1-0.edge3.London2.Level3.net [212.187.201.209]
6 24 ms 14 ms 14 ms ae-0-11.edge4.London2.Level3.net [4.69.200.126]
7 21 ms 14 ms 14 ms ae-3-3.ebr1.London1.Level3.net [4.69.141.189]
8 14 ms 18 ms 24 ms ae-58-113.csw1.London1.Level3.net [4.69.153.122]
9 194 ms 14 ms 212 ms ae-12-51.car2.London1.Level3.net [4.69.139.67]
10 15 ms 14 ms 14 ms vnsc-pri.sys.gtei.net [4.2.2.1]
Trace complete.
C:\Users\John>tracert 4.2.2.2
Tracing route to vnsc-bak.sys.gtei.net [4.2.2.2]
over a maximum of 30 hops:
1 1 ms 1 ms 1 ms dg834 [192.168.0.1]
2 140 ms 14 ms 14 ms lo0-central3.pcl-ag03.plus.net [195.166.128.240]
3 15 ms 14 ms 14 ms gi1-7-331.pcl-gw01.plus.net [84.92.6.80]
4 14 ms 12 ms 13 ms ae3.pcl-cr01.plus.net [195.166.129.40]
5 14 ms 14 ms 13 ms xe-11-1-0.edge3.London2.Level3.net [212.187.201.209]
6 14 ms 14 ms 14 ms ae-0-11.edge4.London2.Level3.net [4.69.200.126]
7 15 ms 14 ms 14 ms ae-3-3.ebr1.London1.Level3.net [4.69.141.189]
8 14 ms 15 ms 14 ms vlan102.ebr2.London1.Level3.net [4.69.143.90]
9 35 ms 24 ms 23 ms ae-23-23.ebr2.Frankfurt1.Level3.net [4.69.148.194]
10 26 ms 24 ms 23 ms ae-82-82.csw3.Frankfurt1.Level3.net [4.69.140.26]
11 25 ms 24 ms 24 ms ae-31-80.car1.Frankfurt1.Level3.net [4.69.154.131]
12 24 ms 25 ms 24 ms vnsc-bak.sys.gtei.net [4.2.2.2]
Trace complete.
C:\Users\John>tracert 4.2.2.3
Tracing route to vnsc-lc.sys.gtei.net [4.2.2.3]
over a maximum of 30 hops:
1 1 ms 1 ms 1 ms dg834 [192.168.0.1]
2 15 ms 14 ms 14 ms lo0-central3.pcl-ag03.plus.net [195.166.128.240]
3 14 ms 13 ms 13 ms gi1-7-331.pcl-gw01.plus.net [84.92.6.80]
4 15 ms 69 ms 14 ms ae3.pcl-cr01.plus.net [195.166.129.40]
5 14 ms 16 ms 14 ms xe-11-1-0.edge3.London2.Level3.net [212.187.201.209]
6 14 ms 14 ms 14 ms ae-0-11.edge4.London2.Level3.net [4.69.200.126]
7 14 ms 14 ms 14 ms ae-3-3.ebr1.London1.Level3.net [4.69.141.189]
8 14 ms 14 ms 21 ms ae-57-112.csw1.London1.Level3.net [4.69.153.118]
9 16 ms 15 ms 14 ms ae-12-51.car2.London1.Level3.net [4.69.139.67]
10 15 ms 15 ms 16 ms vnsc-lc.sys.gtei.net [4.2.2.3]
Trace complete.
C:\Users\John>tracert 4.2.2.4
Tracing route to 4.2.2.4 over a maximum of 30 hops
1 3 ms 2 ms 2 ms dg834 [192.168.0.1]
2 15 ms 15 ms 26 ms lo0-central3.pcl-ag03.plus.net [195.166.128.240]
3 15 ms 14 ms 14 ms gi1-7-331.pcl-gw01.plus.net [84.92.6.80]
4 14 ms 14 ms 13 ms ae3.pcl-cr01.plus.net [195.166.129.40]
5 14 ms 14 ms 14 ms xe-11-1-0.edge3.London2.Level3.net [212.187.201.209]
6 14 ms 14 ms 14 ms ae-0-11.edge4.London2.Level3.net [4.69.200.126]
7 15 ms 14 ms 14 ms ae-3-3.ebr1.London1.Level3.net [4.69.141.189]
8 14 ms 14 ms 14 ms vlan104.ebr2.London1.Level3.net [4.69.143.98]
9 25 ms 24 ms 23 ms ae-22-22.ebr2.Frankfurt1.Level3.net [4.69.148.190]
10 30 ms 23 ms 24 ms ae-72-72.csw2.Frankfurt1.Level3.net [4.69.140.22]
11 * 24 ms * ae-21-70.car1.Frankfurt1.Level3.net [4.69.154.67]
12 24 ms 24 ms 24 ms 4.2.2.4
Trace complete.
C:\Users\John>tracert 4.2.2.5
Tracing route to 4.2.2.5 over a maximum of 30 hops
1 2 ms 2 ms 2 ms dg834 [192.168.0.1]
2 26 ms 50 ms 14 ms lo0-central3.pcl-ag03.plus.net [195.166.128.240]
3 15 ms 14 ms 15 ms gi1-7-331.pcl-gw01.plus.net [84.92.6.80]
4 14 ms 14 ms 14 ms ae3.pcl-cr01.plus.net [195.166.129.40]
5 14 ms 13 ms 14 ms xe-11-1-0.edge3.London2.Level3.net [212.187.201.209]
6 14 ms 14 ms 14 ms ae-0-11.edge4.London2.Level3.net [4.69.200.126]
7 14 ms 14 ms 14 ms ae-3-3.ebr1.London1.Level3.net [4.69.141.189]
8 14 ms 14 ms 20 ms ae-57-112.csw1.London1.Level3.net [4.69.153.118]
9 14 ms 14 ms 14 ms ae-12-51.car2.London1.Level3.net [4.69.139.67]
10 14 ms 14 ms 14 ms 4.2.2.5
Trace complete.
C:\Users\John>tracert 4.2.2.6
Tracing route to 4.2.2.6 over a maximum of 30 hops
1 3 ms 2 ms 2 ms dg834 [192.168.0.1]
2 34 ms 23 ms 20 ms lo0-central3.pcl-ag03.plus.net [195.166.128.240]
3 14 ms 14 ms 13 ms gi1-7-331.pcl-gw01.plus.net [84.92.6.80]
4 14 ms 13 ms 14 ms ae3.pcl-cr01.plus.net [195.166.129.40]
5 14 ms 13 ms 14 ms xe-11-1-0.edge3.London2.Level3.net [212.187.201.209]
6 14 ms 13 ms 14 ms ae-0-11.edge4.London2.Level3.net [4.69.200.126]
7 14 ms 13 ms 14 ms ae-3-3.ebr1.London1.Level3.net [4.69.141.189]
8 27 ms 14 ms 15 ms vlan104.ebr2.London1.Level3.net [4.69.143.98]
9 32 ms 24 ms 23 ms ae-21-21.ebr2.Frankfurt1.Level3.net [4.69.148.186]
10 24 ms 23 ms 23 ms ae-92-92.csw4.Frankfurt1.Level3.net [4.69.140.30]
11 * 25 ms * ae-41-90.car1.Frankfurt1.Level3.net [4.69.154.195]
12 24 ms 24 ms 24 ms 4.2.2.6
Trace complete.
Based on that I suggest 1,3 and 5 are the ones to use. Does that tie up with your benchmark results?
jelv (a.k.a Spoon Whittler) Why I have left Plusnet (warning: long post!) Broadband: Andrews & Arnold Home::1 (FTTC 80/20) Line rental: Pulse 8 Home Line Rental (£14.40/month) Mobile: iD mobile (£4/month) |
Re: Do Some Gateways Block Certain Sites?
28-04-2012 11:38 PM
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Final benchmark results, sorted by nameserver performance:
(average cached name retrieval speed, fastest to slowest)
4. 2. 2. 1 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.029 | 0.034 | 0.038 | 0.001 | 100.0 |
- Uncached Name | 0.031 | 0.108 | 0.396 | 0.099 | 100.0 |
- DotCom Lookup | 0.042 | 0.072 | 0.138 | 0.029 | 100.0 |
---<-------->---+-------+-------+-------+-------+-------+
vnsc-pri.sys.gtei.net
Level 3 Communications
4. 2. 2. 3 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.029 | 0.035 | 0.040 | 0.002 | 100.0 |
- Uncached Name | 0.036 | 0.106 | 0.360 | 0.095 | 100.0 |
- DotCom Lookup | 0.043 | 0.066 | 0.138 | 0.025 | 100.0 |
---<-------->---+-------+-------+-------+-------+-------+
vnsc-lc.sys.gtei.net
Level 3 Communications
4. 2. 2. 5 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.023 | 0.035 | 0.042 | 0.003 | 100.0 |
- Uncached Name | 0.035 | 0.110 | 0.416 | 0.098 | 100.0 |
- DotCom Lookup | 0.037 | 0.067 | 0.178 | 0.027 | 100.0 |
---<-------->---+-------+-------+-------+-------+-------+
··· no official Internet DNS name ···
Level 3 Communications
4. 2. 2. 4 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.039 | 0.044 | 0.050 | 0.002 | 100.0 |
- Uncached Name | 0.042 | 0.120 | 0.376 | 0.094 | 100.0 |
- DotCom Lookup | 0.045 | 0.065 | 0.141 | 0.020 | 100.0 |
---<-------->---+-------+-------+-------+-------+-------+
··· no official Internet DNS name ···
Level 3 Communications
4. 2. 2. 6 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.041 | 0.044 | 0.048 | 0.001 | 100.0 |
- Uncached Name | 0.040 | 0.120 | 0.364 | 0.094 | 100.0 |
- DotCom Lookup | 0.045 | 0.070 | 0.161 | 0.029 | 100.0 |
---<-------->---+-------+-------+-------+-------+-------+
··· no official Internet DNS name ···
Level 3 Communications
4. 2. 2. 2 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.041 | 0.046 | 0.052 | 0.003 | 100.0 |
- Uncached Name | 0.034 | 0.175 | 1.245 | 0.200 | 100.0 |
- DotCom Lookup | 0.039 | 0.124 | 0.409 | 0.095 | 100.0 |
---<-------->---+-------+-------+-------+-------+-------+
vnsc-bak.sys.gtei.net
Level 3 Communications
Re: Do Some Gateways Block Certain Sites?
29-04-2012 3:04 AM
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