Rx Invalid NWID

[davedee]

im see lots of errors in this entry. what is it and what could be causing it?

i don't have these errors on any of my other NS2/NS5

[UBNT-Robert]

Hello Dave,

Is this NS2? NS5? Any details about environment / setup? How about a config file?

[UBNT-Mike.Ford]

Hello Davedee,

If you can be as specific as you can be about your setup this would be great. Normally NWID errors come from other AP's that are not part of your network. In high noise (aka lots of access points) you will have a high amount of NWID errors.

Thanks,

Mike

[davedee]

this is a NS2 network.

this leg of the net has three sta from the ap.

could this be caused co-channel usage by the indor wireless routers set to inappropriate channels? No other usage shows up in the scan option or on wirelessmon.

[UBNT-Mike.Ford]

Hello Davedee,

Yes Invalid NWID's can be cause by any other AP in the vicinity of the units that is not attached to your network.

Thanks,

Mike

[topher80]

Only after 3 minutes, ill get up to 1000 NWID errors. I am using this as a AP(2.4ghz) and have 2 other AP's within 20feet on non-overlapping channels. There are other AP's in the area, but not sure how many would cause this many 'errors' I also don't know what the impact of these errors is.

-topher

[UBNT-Mike.Ford]

Hello Topher80,

The NWID's can affect your link, but not by much. You will lose a very minimal amount of total throughput>

Thanks,

Mike

[davedee]

Hello Topher80,

The NWID's can affect your link, but not by much. You will lose a very minimal amount of total throughput>

Thanks,

Mike

Hi Mike
Soyou are saying that these NWID errors do not cause a break in the network connection.

So if the adjacent aps are shifted out of the channel then the NWIDs will disappear. Is that correct? Im not bothered about the error count if it does not impact the connection.

[UBNT-Mike.Ford]

Hello Davedee,

The NWID's should not affect the link causing the disconnection, unless the AP inteference is so great, but at that point you would need to switch off channel anyways.

Thanks,

Mike

[WHT]

This is what the madwifi web site says...

Invalid NWID

The NWID (or Domain ID) was the parameter used in pre-802.11 wireless systems to create logical networks on the shared medium. 802.11 systems use the ESSID (or variations therein) for this purpose.

An interface will usually have a desired logical network associated with it; any packets received that are not associated with this will be dropped, and will increment the 'invalid nwid' counter. The name is a could now be considered anachronistic.

An increasing 'invalid nwid' counter means that there are other stations transmitting on the channel, or channels that are not completely orthogonal to it. It is an indication of increased use of the channel.

[UBNT-Mike.Ford]

^^^

Witch is correct, and that if you are getting NWID's then you are most likely getting RF interference from other clients/AP's on the same channel.

Thanks,

Mike

[davedee]

Thats the strange thing. If i do the site survey on each of the aps, they are not showing cochannel usage. (or if they are, the signal is in the high -90db range)

my primary channels are 3, 7, 13

a few clients have in-house wireless routers and they are not on the same channels as the NS2s and are 4 channels away in any service area.

dave

[Frotihngdog.ca]

There or only 3 non-overlaping channels in the 2.4 spectrum and that's 1,6 and 11. 3,7 and 11 would overlap. Well that's in Canada anyhow...and I beleive the US as well. Other countries could differ.

[davedee]

3, 7 and 13 are all for different parts of the service area from aerials pointing different directions and with alternate polaritis.

3 and 7 don't overlap areas at all. Just that the NS2s aps are on a mast together. And its 13 that is showing the NWID errors.