DHCP with a WIFI repeater

neumino · 2013-11-28 18:19:29

Hello,

I flashed my old router (an ASUS RT NI6) with DD-WRT and set it up as a repeater.
I can connect to the repeater with my desktop without problem, but my laptop somehow cannot. I usually run Gnome with NetworkManager. The error reported by NetworkManager was a timeout to get an address.
Since I couldn't get more information, I tried to manually connect to the wifi following these instructions: https://wiki.archlinux.org/index.php/Wireless_Setup

But dhcpcd fails with

michel@xone:~$ sudo dhcpcd wlp3s0
dhcpcd[1482]: version 6.1.0 starting
dhcpcd[1482]: wlp3s0: waiting for carrier
dhcpcd[1482]: timed out
dhcpcd[1482]: exited

So I tried to go with dhclient

michel@xone:~$ sudo dhclient -4 -d -v wlp3s0
Internet Systems Consortium DHCP Client 4.2.5-P1
Copyright 2004-2013 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/wlp3s0/8c:70:5a:ff:a4:08
Sending on   LPF/wlp3s0/8c:70:5a:ff:a4:08
Sending on   Socket/fallback
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 13
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

A little more information:
lspci -k

03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 96)
	Subsystem: Intel Corporation Device c220
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi

ip addr

2: wlp3s0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 8c:70:5a:ff:a4:08 brd ff:ff:ff:ff:ff:ff

Running

sudo ip link set wlp3s0 up

Then I get with ip addr

2: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 8c:70:5a:ff:a4:08 brd ff:ff:ff:ff:ff:ff

sudo iw dev wlp3s0 scan -- with the relevant wifi I want to connect to

BSS be:ae:c5:c3:dc:22(on wlp3s0)
        TSF: 702057511 usec (0d, 00:11:42)
        freq: 2462
        beacon interval: 100 TUs
        capability: ESS ShortSlotTime (0x0401)
        signal: -19.00 dBm
        last seen: 2920 ms ago
        Information elements from Probe Response frame:
        SSID: fromage
        Supported rates: 1.0* 2.0* 5.5* 11.0* 18.0 24.0 36.0 54.0 
        DS Parameter set: channel 11
        TIM: DTIM Count 0 DTIM Period 1 Bitmap Control 0x0 Bitmap[0] 0x0
        ERP: <no flags>
        ERP D4.0: <no flags>
        Extended supported rates: 6.0 9.0 12.0 48.0 
        HT capabilities:
                Capabilities: 0x187c
                        HT20
                        SM Power Save disabled
                        RX Greenfield
                        RX HT20 SGI
                        RX HT40 SGI
                        No RX STBC
                        Max AMSDU length: 7935 bytes
                        DSSS/CCK HT40
                Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
                Minimum RX AMPDU time spacing: 8 usec (0x06)
                HT RX MCS rate indexes supported: 0-15
                HT TX MCS rate indexes are undefined
        HT operation:
                 * primary channel: 11
                 * secondary channel offset: no secondary
                 * STA channel width: 20 MHz
                 * RIFS: 1
                 * HT protection: nonmember
                 * non-GF present: 0
                 * OBSS non-GF present: 1
                 * dual beacon: 0
                 * dual CTS protection: 0
                 * STBC beacon: 0
                 * L-SIG TXOP Prot: 0
                 * PCO active: 0
                 * PCO phase: 0
        WMM:     * Parameter version 1
                 * u-APSD
                 * BE: CW 15-1023, AIFSN 3
                 * BK: CW 15-1023, AIFSN 7
                 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
                 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec

The repeater used to have a WPA2 with a pre shared key, but I deactivated all security, so I just connect to the wifi with

sudo iw dev wlp3s0 connect fromage

Trying dhcpcd

michel@xone:~$ sudo dhcpcd wlp3s0
dhcpcd[1482]: version 6.1.0 starting
dhcpcd[1482]: wlp3s0: waiting for carrier
dhcpcd[1482]: timed out
dhcpcd[1482]: exited

Trying with dhclient

michel@xone:~$ sudo dhclient -4 -d -v -1 wlp3s0
Internet Systems Consortium DHCP Client 4.2.5-P1
Copyright 2004-2013 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/wlp3s0/8c:70:5a:ff:a4:08
Sending on   LPF/wlp3s0/8c:70:5a:ff:a4:08
Sending on   Socket/fallback
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 13
No DHCPOFFERS received.
Unable to obtain a lease on first try.  Exiting.

I also made sure that I deactivated wicd, NetworkManaget, netctl-auto, dhcpcd before doing this.

I also tried to set a static ip since dhcp is failing

ip addr add 192.168.0.200/24 dev wlp3s0
ip route add default via 192.168.69.1

But that still doesn't work.

Am I missing something? Am I suppose to set a special mode for my card for a repeater?
I tried to look at the conf file on my desktop, but found nothing special.
I can connect with a wire to the repeater, it works fine too.

If anyone has an idea for something else to try, I would love to hear it : )

Thanks!

nomorewindows · 2013-11-29 02:56:04

If your DHCP is half way decent and you aren't running more than one DHCP server on a single network it should work. Some routers seem to be a little fussy when it comes to linux clients. Of course, Arch has a good dhcp server if your router isn't forgiving. But this problem would not be existing on the repeater.

Arch Linux

#1 2013-11-28 18:19:29

DHCP with a WIFI repeater

#2 2013-11-29 02:56:04

Re: DHCP with a WIFI repeater

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