About Me

ISP & Network guru with 15 years experience in the ISP field.

 

March 2010
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Rescue Tape for sealing Coax

http://www.rescuetape.com/

Great for sealing coax connectors for WISP & Ham uses.

Blog is moving

Justin Wilson’s writings will be moving to j2sw.mtin.net/blog

Please update your bookmarks and rss feeds.  After February 1 this blog will remain for historical purposes only until such times as it is retired.

Install Photo of the day

Canopy Cluster with GPS Sync

802.22

http://en.wikipedia.org/wiki/IEEE_802.22

One of the big benefits of this is the CPE talk back to the base station and relay data about their connection.  After amassing this data determine if the base stations needs to hop a channel or stay on the same channel. Very cool for dealing with noise on the fly.

Cisco TSHOOT Beta Exam

From http://ciscocert.custhelp.com/app/answers/detail/a_id/5798

The TSHOOT beta is an early release of the TSHOOT certification exam, which is used to determine the predictive ability of the exam questions.  It is the same length and covers the same topics as the final exam.  Candidates who pass a beta exam receive full credit, however scores on beta exams are not immediately available. [...]

Install Photo of the day

Rohn 25 around 120 feet

Picture of the Day

Mikrotik 5.8 Backhaul

Connection Limits on Mikrotik

I recently had an instance where I had to re-visit adding connection limits to a CPE running lots of connections.  they were probably P2P. Here is the code we added:

/ip firewall filter
add chain=forward action=log tcp-flags =syn protocol=tcp connection-limit=100,32 log-prefix=”CONN_LIMIT:” comment=”connection limit” disabled=no
add chain=forward action=drop tcp-flags =syn protocol=tcp connection-limit=100,32 comment=”connection limit” disabled=no

What this code does is [...]

2.4GHZ channels

2.4 GHZ in the US has 3 non-overlapping channels (1,6,11). the rest overlap to some degree,

Channel
Frequency

1
2412

2
2417

3
2422

4
2427

5
2432

6
2437

7
2442

8
2447

9
2452

10
2457

11
2462