Jockey
May 7th, 2009, 03:47 AM
Problem
The hostap-driven D-Link DWL-650 wireless card (Intersil Prism 2.5 chipset, PCMCIA interface) does not connect to network, e.g. cannot ping other hosts that is in the same subnet. It DOES associate with a proper AP and get enough network-layer parameters set (whether via dhclient or manual assignment).
Details
After I plug the DWL-650 card into PCMCIA slot, from the output of iwconfig (see below) I see the interface wlan0 has automatically associated with the AP whose ESSID is "TP-LINK_JSK" and BSSID is 00:23:CD:85:A8:E4. Hence, of course, I can assert the DWL-650 card has been set up correctly. Now, I manully assign network-layer parameters as followings:
$ sudo ifconfig wlan0 down
$ sudo ifconfig wlan0 192.168.1.100 broadcast 192.168.1.255 netmask 255.255.255.0 up
and from the output of ifconfig (see below) I can see that the interface has been activated successfully.
However, I cannot even ping the NAT router (see output of ping below). Routing table is okay, as I argue, since 192.168.1.1 and 192.168.1.100 with mask 255.255.255.0 are in the same network so no packets need forwarding at all. Anyway I add one new entry in the table though this makes no difference (see output of netstat below):
$ sudo route add default gw 192.168.1.1 dev wlan0
This problem flys away once I choose orinoco_cs instead of hostap_cs to drive the card. Just comment out the entry
blacklist orinoco_cs
in /etc/modprobe.d/hostap-utils. Operations are the same as above except "wlan0" changed to "eth0".
Is it caused by hostap? The reason to choose hostap_cs rather than orinoco_cs is that with the latter I cannot set host roaming mode to manual control (since no such private parameters defined), which is the key to my current work that is to implement a smooth 802.11 handoff scheme run as a user process, which requires to disable automatic handoff operation performed by the firmware and device driver.
Any effective solution or even just constructive suggestion? Thank you all!
Ubuntu release
Ubuntu 8.10 (Intrepid Ibex)
Wireless NAT router side
IP: 192.168.1.1
Mask: 255.255.255.0
MAC: 00:23:CD:85:A8:E4
ESSID: TP-LINK_JSK
Frequency/Channel: 2.437GHz/06
DHCP Server: Off
No access control and filter machanism enabled, say, shared keys, firewall, MAC-based access control, etc.. Actually I've disabled all these complicated stuff that may cause problems.
Hardwares all right?
Absolutely. On Windows I can surf on the Internet without pains, which means both wireless NAT router and DWL-650 card are just all right.
Various outputs
$ uname -a
Linux ibm-laptop 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008 i686 GNU/Linux
$ pccardctl ident
Socket 0:
product info: "D", "Link DWL-650 11Mbps WLAN Card", "Version 01.02", ""
manfid: 0x0156, 0x0002
function: 6 (network)
$ lspcmcia
Socket 0 Bridge: [yenta_cardbus] (bus ID: 0000:00:13.0)
Socket 0 Device 0: [hostap_cs] (bus ID: 0.0)
$ iwconfig
lo no wireless extensions.
wifi0 IEEE 802.11b ESSID:"TP-LINK_JSK" Nickname:""
Mode:Managed Frequency:2.437 GHz Access Point: 00:23:CD:85:A8:E4
Bit Rate:2 Mb/s Sensitivity=1/3
Retry short limit:8 RTS thr:off Fragment thr:off
Power Management:off
wlan0 IEEE 802.11b ESSID:"TP-LINK_JSK" Nickname:""
Mode:Managed Frequency:2.437 GHz Access Point: 00:23:CD:85:A8:E4
Bit Rate:2 Mb/s Sensitivity=1/3
Retry short limit:8 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=40/70 Signal level=-57 dBm Noise level=-98 dBm
Rx invalid nwid:0 Rx invalid crypt:32 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:5 Missed beacon:0
pan0 no wireless extensions.
$ ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:40:05:ae:b9:a1
inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:6859 (6.8 KB)
Interrupt:3 Base address:0x100
$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 wlan0
$ ping -c 4 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
From 192.168.1.100 icmp_seq=1 Destination Host Unreachable
From 192.168.1.100 icmp_seq=2 Destination Host Unreachable
From 192.168.1.100 icmp_seq=3 Destination Host Unreachable
From 192.168.1.100 icmp_seq=4 Destination Host Unreachable
--- 192.168.1.1 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3016ms
, pipe 3
--EOF--
The hostap-driven D-Link DWL-650 wireless card (Intersil Prism 2.5 chipset, PCMCIA interface) does not connect to network, e.g. cannot ping other hosts that is in the same subnet. It DOES associate with a proper AP and get enough network-layer parameters set (whether via dhclient or manual assignment).
Details
After I plug the DWL-650 card into PCMCIA slot, from the output of iwconfig (see below) I see the interface wlan0 has automatically associated with the AP whose ESSID is "TP-LINK_JSK" and BSSID is 00:23:CD:85:A8:E4. Hence, of course, I can assert the DWL-650 card has been set up correctly. Now, I manully assign network-layer parameters as followings:
$ sudo ifconfig wlan0 down
$ sudo ifconfig wlan0 192.168.1.100 broadcast 192.168.1.255 netmask 255.255.255.0 up
and from the output of ifconfig (see below) I can see that the interface has been activated successfully.
However, I cannot even ping the NAT router (see output of ping below). Routing table is okay, as I argue, since 192.168.1.1 and 192.168.1.100 with mask 255.255.255.0 are in the same network so no packets need forwarding at all. Anyway I add one new entry in the table though this makes no difference (see output of netstat below):
$ sudo route add default gw 192.168.1.1 dev wlan0
This problem flys away once I choose orinoco_cs instead of hostap_cs to drive the card. Just comment out the entry
blacklist orinoco_cs
in /etc/modprobe.d/hostap-utils. Operations are the same as above except "wlan0" changed to "eth0".
Is it caused by hostap? The reason to choose hostap_cs rather than orinoco_cs is that with the latter I cannot set host roaming mode to manual control (since no such private parameters defined), which is the key to my current work that is to implement a smooth 802.11 handoff scheme run as a user process, which requires to disable automatic handoff operation performed by the firmware and device driver.
Any effective solution or even just constructive suggestion? Thank you all!
Ubuntu release
Ubuntu 8.10 (Intrepid Ibex)
Wireless NAT router side
IP: 192.168.1.1
Mask: 255.255.255.0
MAC: 00:23:CD:85:A8:E4
ESSID: TP-LINK_JSK
Frequency/Channel: 2.437GHz/06
DHCP Server: Off
No access control and filter machanism enabled, say, shared keys, firewall, MAC-based access control, etc.. Actually I've disabled all these complicated stuff that may cause problems.
Hardwares all right?
Absolutely. On Windows I can surf on the Internet without pains, which means both wireless NAT router and DWL-650 card are just all right.
Various outputs
$ uname -a
Linux ibm-laptop 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008 i686 GNU/Linux
$ pccardctl ident
Socket 0:
product info: "D", "Link DWL-650 11Mbps WLAN Card", "Version 01.02", ""
manfid: 0x0156, 0x0002
function: 6 (network)
$ lspcmcia
Socket 0 Bridge: [yenta_cardbus] (bus ID: 0000:00:13.0)
Socket 0 Device 0: [hostap_cs] (bus ID: 0.0)
$ iwconfig
lo no wireless extensions.
wifi0 IEEE 802.11b ESSID:"TP-LINK_JSK" Nickname:""
Mode:Managed Frequency:2.437 GHz Access Point: 00:23:CD:85:A8:E4
Bit Rate:2 Mb/s Sensitivity=1/3
Retry short limit:8 RTS thr:off Fragment thr:off
Power Management:off
wlan0 IEEE 802.11b ESSID:"TP-LINK_JSK" Nickname:""
Mode:Managed Frequency:2.437 GHz Access Point: 00:23:CD:85:A8:E4
Bit Rate:2 Mb/s Sensitivity=1/3
Retry short limit:8 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=40/70 Signal level=-57 dBm Noise level=-98 dBm
Rx invalid nwid:0 Rx invalid crypt:32 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:5 Missed beacon:0
pan0 no wireless extensions.
$ ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:40:05:ae:b9:a1
inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:6859 (6.8 KB)
Interrupt:3 Base address:0x100
$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 wlan0
$ ping -c 4 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
From 192.168.1.100 icmp_seq=1 Destination Host Unreachable
From 192.168.1.100 icmp_seq=2 Destination Host Unreachable
From 192.168.1.100 icmp_seq=3 Destination Host Unreachable
From 192.168.1.100 icmp_seq=4 Destination Host Unreachable
--- 192.168.1.1 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3016ms
, pipe 3
--EOF--