> "dan moylan" <jdm@moylan.info> writes:

> > i have two laptops, A running fc2 and B running rh9.0.
> > when they are interconnected with 10base-T cables through
> > the netgear router (MR814), file transfers work fine at
> > about 500KB/sec.  however, when laptop B is connected to
> > the router via a netgear wireless card (MA401), a strange
> > thing happens.  small files transfer ok.  when i try to
> > send a large (470MB) file from A to B, the file transfer
> > starts out at about 200KB/sec, and rapidly drops, bit
> > by bit to like 1Kb/sec, and then the connection is lost
> > completely.  ifconfig (B) shows lots of errors.

derek a writes:
> Sounds like a noisy radio environment.  Did you try changing
> 802.11 channels?

	iwconfig eth0 channel 1

produces:

     Error for wireless request "Set Frequency" (8B04) :
         SET failed on device eth0 ; Operation not supported.

> Did you try turning off your microwave and portable phones?

no need, microwave off, portable phones all off.

> did you try moving the base station?

i tried iwconfig at:

six feet:

eth0      IEEE 802.11-DS  ESSID:"Wireless"  Nickname:"Prism  I"
          Mode:Managed  Frequency:2.462GHz  Access Point: 00:09:5B:23:8A:26
          Bit Rate:11Mb/s   Tx-Power=15 dBm   Sensitivity:1/3
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:66/92  Signal level:-26 dBm  Noise level:-141 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

however, at six feet the signal level varied from -15 to -45 dBm,
somewhat randomly, which is strange in itself.

two feet:

eth0      IEEE 802.11-DS  ESSID:"Wireless"  Nickname:"Prism  I"
          Mode:Managed  Frequency:2.462GHz  Access Point: 00:09:5B:23:8A:26
          Bit Rate:11Mb/s   Tx-Power=15 dBm   Sensitivity:1/3
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:84/92  Signal level:3/153  Noise level:115/153
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

one foot:

eth0      IEEE 802.11-DS  ESSID:"Wireless"  Nickname:"Prism  I"
          Mode:Managed  Frequency:2.462GHz  Access Point: 00:09:5B:23:8A:26
          Bit Rate:11Mb/s   Tx-Power=15 dBm   Sensitivity:1/3
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:92/92  Signal level:5/153  Noise level:115/153
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

tried the file transfer at one foot with the same result.  damn.

what now?

tia,
dan

j. daniel moylan
84 harvard ave #2
brookline, ma 02446-6202
617-232-2360 (tel)
810-454-1823 (fax)
jdm@moylan.info
www.moylan.info