Symptom: DHCP does not assign IP’s when router is using WPA-PSK encryption. ‘Limited or no-connectivity’ messages appear after a ~2 min timeout once wireless client initiates connection. This problem is intermittent and more predominant when the router is under heavy load – experienced whilst playing a video over LAN whilst downloading torrents.
Related Symptom: Wireless traffic at a standstill – ie, trying to set IP’s manually without using DHCP results in timeouts. Gateway address (usually 192.168.1.1 appears in ARP table but appears as invalid MAC addy 00-00-00-00-00-00.) Trying to set mac addy to IP of router statically still doesn’t work.
- WPA-PSK connections to this router are threatened when router is under heavy load.
- New connections will fail as DHCP will not work – once you’ve disconnected, its difficult for the card to reconnect.
- This problem affects a variety of routers. Even the Linksys WRT54G isn’t safe. See this search for more info.
About this setup
Firmware Version: 220.127.116.11
- WGT634U of course
- DSL-302G w/DHCP in bridge mode connected to the Netgear’s Internet port.
- All wireless cards below are affected
- Intel 2100 B wireless mini-pci card
- Netgear WG511U 108Mbps PCMCIA wireless card
- Belkin 11Mbps PCI card
- Lan connections from router to desktop, occasionally to the laptop (these are unaffected)
- Win XP Sp2
- SUSE Linux 10
- Use WEP based encryption and change your keys very frequently.
- Powercycle all equipment (Netgears wizards / documentation indicate client computers should be rebooted when particular settings change – Why do they say this? What am I missing here that a regular enable/disable, clear ARP won’t fix?)
- Use wired LAN to avoid encryption.
- Modded firmware (OpenWGT, others?)
Stuff to Try
- Initially (to replicate the problem and divide and conquer)
- Under WEP encryption, make all wireless clients use static addresses. (no dhcp)
- Switch to WPA encryption, clients still not using DCHP
- Continue using this sort of connection, operating the router under heavy load
- Hibernate PC, Awaken
- Should the connection drop and reconnect, check that traffic still runs thru that link
- If it doesn’t then the problem is not DHCP but WPA-PSK
- If traffic flows then DHCP w/WPA-PSK is the problem (have a feeling its not this one)
- Other settings to try:
- Long preamble – this is more to do with the initiating the connection
- Slower speeds (11Mbps or lower?)
- Reduce complex traffic as much as possible. Remove unnecessary protocols from the Network Connection
- Switch on/off Adaptive Rate, Xtended Range
- Issues about the router overheating due to power supply have been briefly mentioned in some forums (whirlpool, netgear’s support site). One user even mentioned that replacing the PSU with another routers one did the trick – will search for this one on request.
- Use another device as the DHCP server (and maybe even the PPPoE to reduce load) – this would have to be the 302g moved to the Lan port
- play with RTS/CTS fragmentation threshold (determines what type of wireless Collision Detection is used)
- DHCP server on 302g could be interfering with server on WGT634U???