[afnog] WHAT CAUSES NETWORK TO BE SLOW

[Jeff Mason]

Usually, it is due to lack of:
1) Ethernet grease
2) TCP/IP grease
3) UDP grease

Go and buy one bucket of each type of grease at your local department store, rub it on all of your network wires, and your network will be MUCH faster.

Seriously, there are at least one million reasons for a network being slow, some of those reasons follow:

1) Misconfigurations (wrong or bad configurations), such as: 
    a) Some devices inadvertently being set for half duplex, when they should be full duplex.
    b) Devices that do not auto-negotiate properly. So, instead of setting some Gigabit Ethernet port for  Auto-negotiate, try setting it for 100 Mb/sec, Full Duplex or 1000 Mb/sec, Full Duplex
    c) Incorrect network mask, default gateway, subnetting
2) Unrealized throttling at your ISP. Your provider may be limiting your network bandwidth, without letting you know; or, your ISP forgot to remove a "limiting filter" that limits your speed
3) Bad network routers, switches, etc. (or bad ports/motherboards on those devices)
4) Bad WIC cards
5) Bad NIC cards
6) Bad CSU/DSU devices
7) Bad TDM (Time-division Multiplexers) or bad Stat Muxes
8) Bad satellite equipment
9) Bad cables and/or wiring
10) As someone mentioned: Congestion - too many users for some limited amount of bandwith
11) Improperly grounded equipment.
12) Excessive attenuation (loss of signal) due to over-extending certain types of cables. Back in the day, the UTP and STP cables had, I think, 200 Meter limits; and if you extend beyond that, you have to use a repeater or amplifier of some sort.
13) Bad end-point equipment.
14) Interference and/or Bad/flaky/unreliable wi-fi equipment. If you use any wi-fi repeaters or routers, be aware of interference on 900 Mhz, 2.4GHz and 5Ghz bands.
15 Device incompatibilities.

But seriously, you would need to provide much more information, including types of equipment, configuration, where you are seeing the problem, and type of network; before someone could give a better answer.

Jeff Mason, MCSE, BBA CIS
MDHA Systems Administrator
615-780-7031
jmason at nashville-mdha.org

-----Original Message-----
From: afnog [mailto:afnog-bounces at afnog.org] On Behalf Of MOHAMMED Kabiru Hamza
Sent: Saturday, October 11, 2014 8:51 AM
To: afnog at afnog.org
Subject: [afnog] WHAT CAUSES NETWORK TO BE SLOW


Hi All.

Please my question is that what causes network to be slow?

Awaiting your responses

Mohammed Kabir
UDU Sokoto

_______________________________________________
afnog mailing list
http://afnog.org/mailman/listinfo/afnog

**********************************************************************
Although MDHA has taken reasonable precautions to ensure no viruses are present in
this email, MDHA cannot accept responsibility for any loss or damage arising from the
use of this email or attachments.

This communication is confidential and may contain privileged information intended 
solely for the named addressee(s). It may not be used or disclosed except for the 
purpose for which it has been sent. If you are not the intended recipient, you must not 
copy, distribute or take any action in reliance on it. Please note that any views or 
opinions presented in this email are solely those of the author and do not necessarily 
represent those of MDHA. If you have received this communication in error, please 
notify MDHA by emailing systemadministrator at nashville-mdha.org, quoting the sender, 
and then delete the message and any attached documents. MDHA accepts no liability or 
responsibility for any onward transmission or use of emails and attachments having left 
the MDHA domain.
**********************************************************************