WiFi intermittant cutout - IPv6

[paul van den bergen]

Hi all,

I've noticed some odd and frustrating behaviour and am looking for some help.

I have a 3 network setup for MIP6 (aka Kame snap of a few weeks ago).

consider one section of the network.

CN (host) <-> fec0:200:: <-> HN (router) <-> fec0:10:: <-> MN (host)

the fec0:10:: network is an 802.11b network.

I can either set it up as an AP based connection

e.g.

HN - wi0 - - - - AP - - - - an0 - MN

or as an adhoc connection

HN - wi0 - - - - - - an0 - MN


for some reason, every now and again, the connectivity between the two ends 
drops off, with either a No route to host or ping rejection, depending which 
side of the remote host I am pinging... this is independant of adhoc or AP

sometimes I can get the network connected by doing 
wicontrol -c 1
or some such - 
starting tcpdump on the an0 interface after starting the pings seems 
guarenteed to kill connectivity. but starting tcpdump ahead of time mostly 
doesn't.

the hosts are accepting rtadv and the routers are forwarding ipv6 traffic.

the same behaviour if I set up IPv4...

HN wicontrol output

NIC serial number:                      [ 99SA01000000 ]
Station name:                           [ HomeNet ]
SSID for IBSS creation:                 [ MAGIC-ADHOC ]
Current netname (SSID):                 [ MAGIC-ADHOC ]
Desired netname (SSID):                 [ MAGIC-ADHOC ]
Current BSSID:                          [ 62:00:e6:00:06:01 ]
Channel list:                           [ 2047 ]
IBSS channel:                           [ 1 ]
Current channel:                        [ 1 ]
Comms quality/signal/noise:             [ 92 154 13 ]
Promiscuous mode:                       [ Off ]
Process 802.11b Frame:                  [ Off ]
Intersil-Prism2 based card:             [ 1 ]
Port type (1=BSS, 3=ad-hoc):            [ 3 ]
MAC address:                            [ 00:30:ab:20:a2:4c ]
TX rate (selection):                    [ 3 ]
TX rate (actual speed):                 [ 11 ]
RTS/CTS handshake threshold:            [ 2347 ]
Create IBSS:                            [ Off ]
Access point density:                   [ 1 ]
Power Mgmt (1=on, 0=off):               [ 0 ]
Max sleep time:                         [ 100 ]
WEP encryption:                         [ Off ]
TX encryption key:                      [ 1 ]
Encryption keys:                        [  ][  ][  ][  ]

MN ancontrol -C output
Operating mode:                         [ ad-hoc ]
Receive mode:                           [ broadcast/multicast/unicast ]
Fragment threshold:                     [ 2312 ]
RTS threshold:                          [ 2312 ]
MAC address:                            [ 00:09:7c:85:82:74 ]
Supported rates:                        [ 1.0Mbps 2.0Mbps 5.5Mbps 11.0Mbps ]
Short retry limit:                      [ 16 ]
Long retry limit:                       [ 16 ]
TX MSDU lifetime:                       [ 5000 ]
RX MSDU lifetime:                       [ 10000 ]
Stationary:                             [ Off ]
Ordering:                               [ Off ]
Device type:                            [ unknown (7f) ]
Scanning mode:                          [ active ]
Probe delay:                            [ 3 ]
Probe energy timeout:                   [ 3 ]
Probe response timeout:                 [ 20 ]
Beacon listen timeout:                  [ 40 ]
IBSS join network timeout:              [ 10000 ]
Authentication timeout:                 [ 2000 ]
WEP enabled:                            [ no ]
Authentication type:                    [ open ]
Association timeout:                    [ 5000 ]
Specified AP association timeout:       [ 10000 ]
Offline scan interval:                  [ 0 ]
Offline scan duration:                  [ 0 ]
Link loss delay:                        [ 0 ]
Max beacon loss time:                   [ 500 ]
Refresh interval:                       [ 10000 ]
Power save mode:                        [ none ]
Sleep through DTIMs:                    [ Off ]
Power save listen interval:             [ 200 ]
Power save fast listen interval:        [ 100 ]
Power save listen decay:                [ 2 ]
Power save fast listen decay:           [ 200 ]
AP/ad-hoc Beacon period:                [ 100 ]
AP/ad-hoc ATIM duration:                [ 0 ]
AP/ad-hoc current channel:              [ 1 ]
AP/ad-hoc DTIM period:                  [ 1 ]
Radio type:                             [ 802.11 DS ]
RX Diversity:                           [ antenna 1 and 2 ]
TX Diversity:                           [ antenna 1 and 2 ]
Transmit power level:                   [ 100 ]
RSS threshold:                          [ 0 ]
Node name:                              [ MobileNode      ]
ARL threshold:                          [ 65535 ]
ARL decay:                              [ 65535 ]
ARL delay:                              [ 65535 ]
Configuration:                          [ Enterprise Configuration ]

WEP Key status:
        The active transmit key is 0


any idea why my network is goign up and down?

-- 
Dr Paul van den Bergen
Centre for Advanced Internet Architectures
caia.swin.edu.au
pvandenbergen at swin.edu.au
IM:bulwynkl2002
"And some run up hill and down dale, knapping the chucky stones 
to pieces wi' hammers, like so many road makers run daft. 
They say it is to see how the world was made."
Sir Walter Scott, St. Ronan's Well 1824