Bridge Install

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Note: I am a CQT specialist for a high-security wireless hardware company, as well as a system administrator for Linux systems. If someone either corrects me or confirms my findings, I will be happy to do something to contribute to the effort and fix this problem. Note: I am a CQT specialist for a high-security wireless hardware company, as well as a system administrator for Linux systems. If someone either corrects me or confirms my findings, I will be happy to do something to contribute to the effort and fix this problem.
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Revision as of 11:38, 11 February 2006

Contents

Bridge Mode Install (Client Bridge)

I was having trouble getting OpenWRT to do any sort of bridging with my Belkin A/G ap, so I'm trying out bridge mode using DD-WRT.

Hardware: Linksys WRT54G V2 / Belkin A+G Dual Mode AP Router F6D3230-4 firmware 1.01.05

Flashing from OpenWRT and getting to the GUI

I figured I'd give it a go to just use the 'upgrade firmware' link in OpenWRT to flash DD-WRT2.3-voip. It worked, using a laptop and my Belkin A mode wlan connection. Once the flash was rolling, I did an

ifconfig eth0 192.168.1.100

to bring up the laptop ethernet connection to the linksys. Then http://192.168.1.1 brought up the gui. Now to figure out the default username and password. Ok, default username is blank. Default password is admin.

Configuration

My local network is 10.6.6.0/24, my belkin is at 10.6.6.1, ssid examplessid, channel 1, WPA-PSK, with a 63 character passphrase. (The belkin does not allow a 64 hex key to be entered, only a passphrase.)

Setup

Basic Setup

First page, Internet is disabled (I use another pc as a gateway connected to my cable modem). DHCP server is also disabled, I use static ips in my lan.

  • Assign WAN port to Switch - enabled
Advanced Routing
  • Advanced Routing
    • Operating Mode - Gateway

Wireless

Basic Settings
  • Wireless Mode - Client Bridge
  • Wireless Network Mode - Mixed
  • Wireless Network Name (SSID) - examplessid
Wireless Security
  • Security Mode - WPA2 Pre-Shared Key (The belkin calls it WPA but allows me to use AES, so from what I understand that would be WPA2
  • WPA Algorithms - TKIP+AES (I used AES on the Belkin but I'm unsure about the Group Key, so this can't hurt.

There is a problem here. The belkin only allows a 63 character passphrase. The DD-WRT requires the actual hex key. I've tried to figure out how to deal with this but I got nowhere. I think this is the root of the problem of getting WPA mode to work for me... see below.

I had to change Security mode to 128 wep, on both routers. It should have worked, if WPA works at all in these routers, but as I don't have all week to sit here and figure it out, I fell back to wep. My suggestion for the DD-WRT interface is that it allows entry of either a passphrase or key, and handles the conversion itself. This would allow use of routers like the Belkin that only allow passphrases.

Security

Firewall
  • Firewall Protection - Disabled

Administration

Management
  • DNS Masq - Disable
  • Local DNS - Disable
  • 802.1X - Disable
  • NTP Client - Disable
  • Loopback - Disable
Services
  • SSHD - Enable (This probably should be the default)
  • Telnet - Disable (This probably should be the default)

Conclusion

I got nowhere further with this than I got with OpenWRT. It was a waste of time. Both OpenWRT and DD-WRT still, as of version 2.3, cannot do a client mode connection to an AP using WPA security, where the AP being connected to is using a passphrase, and the client is using a key. This is my assumption, because others have gotten it to work with other routers, which must have been using a hex key and not a passphrase. Pleas enlighten me if this is not the real problem here.

Note: I am a CQT specialist for a high-security wireless hardware company, as well as a system administrator for Linux systems. If someone either corrects me or confirms my findings, I will be happy to do something to contribute to the effort and fix this problem.