I recently picked up a 2926 when a NIC on my Sophos UTM mini PC threw a seven. After setting up my Virgin Media broadband on Wan1, it pulled down DCHP settings as expected, except for the DNS entries which were displaying Google's servers. I set the DCHP address to static, updated the DNS entires to point to Virgin Broadband and then set it back to DHCP. DNS settings don't appear to have reverted back to Google and in fact, for all I know, could have just been displaying some old firmware entries without actually using them. Didn't test at the time, so no idea. Weird though.