[maemo-developers] [maemo-developers] Re: Avoiding loopback local IP address mode in WIFI connections using Internet Tablet OS 2006

[From: Sebastian Spaeth]

	....Resending as I wasn't subscribed yet....
Patrik Flykt wrote:
>> Perhaps some sniffing with tcpdump might help...
>> I'll get to that during next week.
> 
> That would be really great! Thanks!

I just tried to connect my N770 to an Apple Powerbook (Mac OSX 10.4 with
WLAN Internet sharing turned on). All other Macs and also Debian based
boxes are able to connect to this box just fine using DHCP. Below is the
tcpdump sniffing from the MAC side. It seems the MAC receives DHCP
requests but just doesn't answer them. Which is awkward given that it
answers other boxes requests using the same configuration. Please note
that this is not a WEP issue or related to signal strength etc.. If I
manually assign IP, DNS etc the 770 can use the connection just fine.

If you need more info let me know.

Sebastian Spaeth

P.S. 00:14:a7:fa:87:e5 should be my N770. The 770 continues to send DHCP
requests frequently even after it connected using a link-local connection.

-------------------------------------------------------------------------------------------
sudo tcpdump -i en1 -A
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on en1, link-type EN10MB (Ethernet), capture size 96 bytes
14:52:15.766077 00:14:a7:fa:87:e5 > Broadcast null xid/R: 01 00 len=0

......
14:52:16.086393 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:14:a7:fa:87:e5, length: 548

E.. at ....@.x..........D.C.,......=.
n..............................................
14:52:18.345168 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:14:a7:fa:87:e5, length: 548

E.. at ....@.x..........D.C.,......=.
n..............................................
14:52:21.485325 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:14:a7:fa:87:e5, length: 548

E.. at ....@.x..........D.C.,......=.
n..............................................
14:52:24.712444 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:14:a7:fa:87:e5, length: 548

E.. at ....@.x..........D.C.,......=.
n..............................................
14:52:26.218366 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j.......................$.J{....................
14:52:27.490525 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j.......................$.J{....................
14:52:27.922989 arp who-has 169.254.133.92 tell 0.0.0.0

...........................\..................
14:52:28.370291 IP 10.0.2.1.49468 > 224.0.0.251.mdns:  42281+ PTR?
92.133.254.169.in-addr.arpa. (45)
E..I.d....9D
.
         .......<...5.B.)...........92.133.254.169.in-addr.arpa.....
14:52:28.440001 arp who-has 169.254.133.92 tell 0.0.0.0

...........................\..................
14:52:28.621119 sebastian-spaeths-powerbook-g4-12.local.49469 >
ff02::fb.mdns:  42281+[|domain] [hlim 1]

`....5............$...J{.................=...5_..)...........92.133.254.169.in-add
14:52:28.871583 IP 10.0.2.1.49468 > 224.0.0.251.mdns:  42281+ PTR?
92.133.254.169.in-addr.arpa. (45)
E..I.g....9A
.
         .......<...5.B.)...........92.133.254.169.in-addr.arpa.....
14:52:28.952158 arp who-has 169.254.133.92 tell 0.0.0.0

...........................\..................
14:52:29.122375 sebastian-spaeths-powerbook-g4-12.local.49469 >
ff02::fb.mdns:  42281+[|domain] [hlim 1]

`....5............$...J{.................=...5_..)...........92.133.254.169.in-add
14:52:29.372841 IP 10.0.2.1.49468 > 224.0.0.251.mdns:  42281+ PTR?
92.133.254.169.in-addr.arpa. (45)
E..I.j....9>
.
         .......<...5.B.)...........92.133.254.169.in-addr.arpa.....
14:52:29.448633 IP 10.0.2.1.mdns > 224.0.0.251.mdns:  0*- [0q]
3/0/0[|domain]
E....m....:.
.
         ............rx............9Sebastian Spaeth...s PowerBook G4
12" [00
14:52:29.460675 arp who-has 169.254.133.92 tell 0.0.0.0

...........................\..................
14:52:29.623683 sebastian-spaeths-powerbook-g4-12.local.49469 >
ff02::fb.mdns:  42281+[|domain] [hlim 1]

`....5............$...J{.................=...5_..)...........92.133.254.169.in-add
14:52:29.874159 IP 10.0.2.1.49468 > 224.0.0.251.mdns:  42281+ PTR?
92.133.254.169.in-addr.arpa. (45)
E..I.p....98
.
         .......<...5.B.)...........92.133.254.169.in-addr.arpa.....
14:52:29.956853 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j.......................$.J{....................
14:52:30.124947 sebastian-spaeths-powerbook-g4-12.local.49469 >
ff02::fb.mdns:  42281+[|domain] [hlim 1]

`....5............$...J{.................=...5_..)...........92.133.254.169.in-add
14:52:30.477766 arp who-has 169.254.133.92 tell 169.254.133.92

.................\.........\..................
14:52:31.483362 arp who-has 169.254.133.92 tell 169.254.133.92

.................\.........\..................
14:52:31.565479 IP 10.0.2.1.49472 > 224.0.0.251.mdns:  62095+[|domain]
E..v......8.
.

....... at ...b...............b.7.a.4.f.9.e.f.f.f.4.2.1.1.2.0.0.0.0.0.0
14:52:31.566719 IP 10.0.2.1.mdns > 224.0.0.251.mdns:  0*- [0q] 1/0/0 (137)
E.........:.
.
         ............
..............B.7.A.4.F.9.E.F.F.F.4.2.1.1.2.0.0.0.0.0.0
14:52:34.349901 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j.......................$.J{....................
14:52:43.037815 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j.......................$.J{....................
14:52:51.870776 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j.......................$.J{....................
14:53:00.400795 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j.."....................$.J{....................
14:53:09.355560 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4......X7j..+....................$.J{....................
14:53:17.447260 IP 0.0.0.0.bootpc > broadcasthost.bootps: BOOTP/DHCP,
Request from 00:11:24:9f:4a:7b, length: 300

E..H.................D.C.4.~....X7j..3....................$.J{....................