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Scenario: |
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- I have a HAG (Home Access Gateway, which embodies an ADSL modem) |
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installed by my provider; |
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- the HAG has three RJ45 ports; when a PC is connected to one of |
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theese ports, it gets an IP address via DHCP; |
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- I have connected a Belkin wireless rooter to one of theese ports; |
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- I connect my PC to another port, and/or to the wireless router (by |
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running modprobe ndiswrapper; then /etc/init.d/net.wlan0 is ran by |
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ifplugs - at least, this is what I can guess ;-). |
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|
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When I run Windows, my wireless connection is "normal", but when I run |
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Gentoo there are strange delays. For example, a simple ping is fast |
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under Windows, very slow under Gentoo. I have to stop net.wlan0 to |
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get "normal" pings again. |
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|
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As far as I can understand, it is a matter of metric. |
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When I only connect my PC to the wireless router, I can see: |
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|
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a) under Windows (the output is in Italian, but I'm sure you can read |
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it - using a fixed font may help ;-): |
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|
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> route PRINT |
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============================================================ |
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Elenco interfacce |
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0x1 ........................... MS TCP Loopback interface |
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0x2 ...00 16 d3 09 2d 17 ...... NVIDIA nForce Networking |
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0x3 ...00 14 a5 e1 d2 b9 ...... WLAN Broadcom 802.11a/b/g |
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============================================================ |
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============================================================ |
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Route attive: |
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Indirizzo rete Mask Gateway Interfac. Metric |
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0.0.0.0 0.0.0.0 192.168.2.1 192.168.2.2 25 |
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127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 |
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192.168.2.0 255.255.255.0 192.168.2.2 192.168.2.2 25 |
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192.168.2.2 255.255.255.255 127.0.0.1 127.0.0.1 25 |
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192.168.2.255 255.255.255.255 192.168.2.2 192.168.2.2 25 |
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224.0.0.0 240.0.0.0 192.168.2.2 192.168.2.2 25 |
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255.255.255.255 255.255.255.255 192.168.2.2 2 1 |
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255.255.255.255 255.255.255.255 192.168.2.2 192.168.2.2 1 |
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Gateway predefinito: 192.168.2.1 |
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============================================================ |
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Route permanenti: |
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Nessuno |
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|
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b) under Gentoo: |
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|
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b.1) fast: |
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|
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sergio ~ # route -n |
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Kernel IP routing table |
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Destination Gateway Genmask Flags Metric Ref Use Iface |
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192.168.2.0 0.0.0.0 255.255.255.0 U 2000 0 0 wlan0 |
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127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo |
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0.0.0.0 192.168.2.1 0.0.0.0 UG 2000 0 0 wlan0 |
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|
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b.1) very slow: |
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|
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sergio ~ # route |
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Kernel IP routing table |
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Destination Gateway Genmask Flags Metric Ref Use Iface |
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192.168.2.0 * 255.255.255.0 U 2000 0 0 wlan0 |
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loopback * 255.0.0.0 U 0 0 0 lo |
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default 192.168.2.1 0.0.0.0 UG 2000 0 0 wlan0 |
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|
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I can just notice an astonishing difference between metrics: 25 under |
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Windows, 2000 (!) under Linux. |
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|
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I've tried "route del default" and then "route add default gw |
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192.168.2.1 metric 0", but the wireless connection was still slow. |
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"Slow" means, for example, that if I use my browser and go |
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to "www.google.com", "Looking for www.google.com" lasts too mach. |
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|
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Any hints? |
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Thanks |
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Sergio |
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-- |
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