Category: Internet Networking

DNS Root Servers
article #1017, updated 89 days ago

As of this writing, the current authoritative list, from here:

https://www.iana.org/domains/root/servers

is:

a.root-servers.net 198.41.0.4 2001:503:ba3e::2:30 VeriSign, Inc.
b.root-servers.net 192.228.79.201 2001:500:84::b University of Southern California (ISI)
c.root-servers.net 192.33.4.12 2001:500:2::c Cogent Communications
d.root-servers.net 199.7.91.13 2001:500:2d::d University of Maryland
e.root-servers.net 192.203.230.10 2001:500:a8::e NASA (Ames Research Center)
f.root-servers.net 192.5.5.241 2001:500:2f::f Internet Systems Consortium, Inc.
g.root-servers.net 192.112.36.4 2001:500:12::d0d US Department of Defense (NIC)
h.root-servers.net 198.97.190.53 2001:500:1::53 US Army (Research Lab)
i.root-servers.net 192.36.148.17 2001:7fe::53 Netnod
j.root-servers.net 192.58.128.30 2001:503:c27::2:30 VeriSign, Inc.
k.root-servers.net 193.0.14.129 2001:7fd::1 RIPE NCC
l.root-servers.net 199.7.83.42 2001:500:9f::42 ICANN
m.root-servers.net 202.12.27.33 2001:dc3::35 WIDE Project

Categories:   DNS   Internet Networking

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Time synchronization (NTP, SNTP) setup
article #37, updated 122 days ago

In Windows Server 2012 R1/2, 2008 R1/2, 7, Vista, and 2003 SP2 and later, it’s good to run the following two commands in an administrative command prompt (an ordinary command prompt for 2003):

w32tm /config /manualpeerlist:pool.ntp.org,0.pool.ntp.org,1.pool.ntp.org,2.pool.ntp.org /syncfromflags:MANUAL /reliable:YES /update
w32tm /resync

In Server 2003 SP1 and before, and XP, we use this, because /reliable doesn’t exist:

w32tm /config /manualpeerlist:pool.ntp.org,0.pool.ntp.org,1.pool.ntp.org,2.pool.ntp.org /syncfromflags:MANUAL /update
w32tm /resync

Sometimes w32tm doesn’t exist as a service, and has to be registered:

w32tm /register

Under Windows 2000, we need to go a bit more archaic:

net time /setsntp:pool.ntp.org
net time /querysntp

If you are using Windows DHCP services, the above is best for the server, but for all of the workstations under its control, place the server’s IP in the Time Server option. This is probably best for a domain. When you have standalone or mobile-capable machines, best to just use the w32tm configuration above.

Categories:   Internet Networking   LAN Networking

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DNS, Whois, et cetera
article #12, updated 312 days ago

A great place for general DNS lookup info:

http://www.dnsstuff.com/

One for WHOIS (use the little submit box in the far upper-right corner):

http://www.whois.com

And one for info about IP addresses:

http://www.arin.net/index.shtml

Categories:   DNS   Internet Networking

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Fairer distribution of site Internet bandwidth, via Watchguard
article #945, updated 370 days ago

What will help is a “Per IP Address” type traffic management policy, in Setup / Actions / Traffic Management in WSM, using zero for maximum, 256 for “Maximum instance” (this is the number of IP addresses according to the documentation), and most significantly a low “guaranteed bandwidth” calculated by a formula at or close to this:

(TotalInternetBandwidth รท TotalDHCPLeases) X 0.8

The static multiplier from 0.8 to 0.5 or even less depending on situation, but done properly it will keep everyone working.

Categories:   Internet Networking   

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Internet connection speed tests
article #182, updated 432 days ago

Here’s a great new one, HTML5 only, no Flash or Java:

http://www.bandwidthplace.com

Here’s a commonly used one which requires Flash:

http://www.speedtest.net

And another which uses java:

http://www.speakeasy.net/speedtest/

Categories:   Internet Networking   LAN Networking

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IP4 subnet calculators
article #79, updated 569 days ago

For CIDR to IP range (IP range extraction):

http://bonomo.info/coyote/cidr-calculator.php

For IP range to CIDR:

http://ip2cidr.com/

For lots and lots more:

http://www.subnetmask.info/

Categories:   Internet Networking   LAN Networking

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wget for Windows
article #63, updated 875 days ago

Wget is an excellent command-line tool for retrieval of data from http or ftp servers. Its current most-up-to-date Windows version seems to be here:

https://eternallybored.org/misc/wget/

Categories:   Internet Networking   Tools

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Override domain transfer lock on GoDaddy / Wild West Domains
article #647, updated 1172 days ago

After changes are made to domain contacts at GoDaddy, Wild West Domains, and subsidiaries, it will say something like:

Transfer locked until 4/8/2014: Contact information change

This is a 60-day automatic lock, and it can be overridden by an email from the registrant contact to review60@godaddy.com.

Categories:   Web Methods   Internet Networking

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Check Your Blacklists
article #644, updated 1173 days ago

Here’s a great place to do so:

http://www.dnsbl-check.info/

Categories:   Internet Networking   Tools

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New FTP client, also does cloud storage systems
article #549, updated 1413 days ago

Looks most interesting:

http://cyberduck.ch/

Categories:   Internet Networking   Tools