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Sprint HTC EVO SSID Cisco WRT310N issue

Sprint HTC EVO Wi-Fi SSID Problem Report

Written by: Doug Mohney (moo@vegascommando.com)

Last updated: 6/24/2010; added solution for problem.

(OK, to be fair, this is a Cisco WRT310N firmware issue rather than an EVO issue, but the buzz I’ve heard circles around the EVO….)

Observed Issue: Sprint HTC EVO fails to find unbroadcast/”hidden” SSID network on Cisco WRT310N 802.11n with older firmware release.

EQUIPMENT AND SOFTWARE INVOLVED

Router: Cisco Linksys WRT310N Wireless-N Gigabit Router, version 1.0 hardware, Firmware version v1.0.07-LS-HND (v1.0.07 build 014-LS-HND Dec 1, 2008)

Device: Sprint HTC EVO Model PC36100

Hardware information
Hardware version
0003

Firmware version
2.1-update1

Baseband version
1.39.00.05.31

Kernel version
2.6.29-a2443432
htc-kernel@and18-2 #1

Build number
1.32.651.6 CL171253 release-keys

Software number
1.32.651.6

Other wireless devices on network at time problem was observed: TiVo 802.11 b/g network adapters (two in operation)

Wireless security in use on network when problem was observed: WPA/WPA2 PSK

DESCRIPTION OF PRIMARY ISSUE:

Sprint HTC EVO fails to discover wireless network when network mode is set to “Mixed” (i.e. when the Cisco router is willing to accept 802.11n, 802.11b, and 802.11g clients) and SSID Broadcast on the Cisco router is set to “Disabled” — even though Wi-Fi network is defined on EVO properly with SSID, security type, and correct password.

HTC > Wi-Fi networks says the not-broadcasted SSID network in question is “Not in range, remembered” but other devices (HP laptop with 802.11 b/g, Linksys USB 802.11n dongle, Tivo 802.11 b/g network adapters, Apple iPhone 3GS) have no problem finding the network.

Issue appears to be consistently repeatable .

SOLUTION:

Upgrade WRT310N firmware to latest release version -  v1.0.09 (December 2009 release date).

Issue goes away; also appears to be some observed increase in WiFi throughput/signal strength when communicating with EVO with the latest firmware, but I can’t swear to it in a court of law.

SUGGESTED WORKAROUNDS IF A FIRMWARE UPGRADE CANNOT IMMEDIATELY BE IMPLEMENTED :

1) In “Mixed” mode, set SSID Broadcast to “Enabled” or

2) Select “Network Mode” to “BG-Mixed”

Do one or the other, depending on your preference. You don’t have to do both!

ISSUES WITH WORKAROUNDS:

For option 1) Decrease in security by setting SSID to Broadcast

For option 2) a) Forcing network mode to “BG-Mixed” defeats the purpose of having 802.11n devices.

Unclear if using either 1) or 2) provides any signal strength advantages.

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