I'm trying to use Jaunty on my Centrino laptop as a wireless access point / NAT. My cable modem is plugged in to the ethernet port. Strangely, when I enable the wireless card (via hostapd or simply 'ifconfig wlan1 192.168.0.1 up'), my WIRED network slows down. On a terminal on the laptop, I see transfer speeds drop from over about 200 K/s to about 40 K/s. As far as I can tell, the problem is not affected by iptables rules, ip_forward on/off, or ipv6. Just having the wireless card present and active seems to affect the wired interface. The problem may have something to do with having hostapd active, but I'm not sure. Aside: I have an intel wireless card built-in but since it can't do hostap-mode, I purchased the ath9k cardbus card. The intel card is disabled by function-key and is not active on boot. I have recent versions of the kernel and hostapd from the subversion repositories discussed on linuxwireless.org. Linux version 2.6.30-custom-wl (root@whitebook) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #1 SMP Thu Jun 18 19:22:02 CDT 2009 00:00.0 Host bridge: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller (rev 02) 00:00.1 System peripheral: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller (rev 02) 00:00.3 System peripheral: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller (rev 02) 00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02) 00:02.1 Display controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 03) 00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 83) 00:1f.0 ISA bridge: Intel Corporation 82801DBM (ICH4-M) LPC Interface Bridge (rev 03) 00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE Controller (rev 03) 00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 03) 00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 03) 00:1f.6 Modem: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Modem Controller (rev 03) 01:01.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection (rev 05) 01:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) 01:04.0 CardBus bridge: Texas Instruments PCI1410 PC card Cardbus Controller (rev 02) 01:05.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306 Fire II IEEE 1394 OHCI Link Layer Controller (rev 80) 02:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01) Speed test: (start with everything active. NAT works, other computers can reach the internet through the laptop, but the speed is just slow. For this test, no other machines were connected so they're not consuming the bandwidth) $ wget http://cosmos.cites.uiuc.edu/pub/ubuntu-iso/9.04/ubuntu-9.04-desktop-amd64.iso [snip] 47.6K/s eta 4h 56m $ sudo ifdown wlan1 [snip] 44.5K/s eta 5h 54m $ sudo ifconfig mon.wlan1 down [snip] 245K/s eta 45m 7s As you can see, I lose about a factor of 5 when the wireless card is active. I also posted this question to https://answers.launchpad.net/ubuntu/+question/76037 Thanks in advance, David -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
