From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Denk Date: Sun, 28 Oct 2007 23:01:17 +0100 Subject: [U-Boot-Users] [PATCH] DHCP Client Fix In-Reply-To: Your message of "Fri, 19 Oct 2007 10:15:29 EDT." <4155D0DA4B6B044891B3F19311C7E7B89C45E4@EXCHANGE1.886llc.local> Message-ID: <20071028220117.E732F24756@gemini.denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Dear Justin, in message <4155D0DA4B6B044891B3F19311C7E7B89C45E4@EXCHANGE1.886llc.local> you wrote: > > I recently upgraded the firmware on some of my old Linksys WRT54G > routers (version 5) from firmware version 1.0.6 to firmware version > 1.02.2, both of which are released by Linksys and U-Boot was no longer > able to get an IP address using DHCP. However, with the older firmware > (version 1.0.6), U-Boot was still able to get an IP through DHCP. > > Using a hub and a packet sniffer, I was able to locate the problem. The > U-Boot code will bind to an IP address offered by the DHCP server > prematurely and the DHCP server will not respond with an ACK, rendering I have to admit that I'm not sure if this is a bug in U-Boot or in the Linksys router (which I have under special observation as they explicitely and intentionally violate the U-Boot GPL). > the system without an IP address. This is no longer valid when using a > Linksys router as DHCP server. I modified the code to operate the way > the Linux DHCP client does by not binding to the offered IP until the > DHCP client receives the ACK sent by the server, ending the > conversation. After making the appropriate changes, DCHP service was > restored for all flavors of the Linksys firmware that I have available > (v 1.02.2 and v1.0.6 for the version 5 router, v8.00.2 for the version 8 > router). It has also been tested on an AirPort Extreme router running > DHCP. > > Attached is the patch with the code changes that were made. Any feed > back would be appreciated. I'm waiting for feedback (or a pull request?) from the network custodian. Ben??? Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de 365 Days of drinking Lo-Cal beer. = 1 Lite-year