Hello, When attempting to connect to chzrh02 using AICCU I receive 0.0.0.0 as the PoP IPv4 address. Connecting to a chzrh01 tunnel from the same box work without a problem (so at first glance it does not seem to be a local issue). I assume that this is the reason my tun interface can not be set up. The router is a OpenWRT White Russian build. I'm using the following AICCU version: # aiccu version AICCU 2007.01.15-console by Jeroen Massar The full output of Aiccu (notice the Pv4 POP line): # aiccu start sock_getline() : "200 SixXS TIC Service on noc.sixxs.net ready (http://www.sixxs.net)" sock_printf() : "client TIC/draft-00 AICCU/2007.01.15-console Linux/2.4.30" sock_getline() : "200 Client Identity accepted" sock_printf() : "get unixtime" sock_getline() : "200 1267372730" sock_printf() : "username PBF8-SIXXS" sock_getline() : "200 Choose your authentication challenge please" sock_printf() : "challenge md5" sock_getline() : "200 346190249f5987db7311511bce36ef19" sock_printf() : "authenticate md5 [removed]" sock_getline() : "200 Succesfully logged in using md5 as PBF8-SIXXS (Philipp Bunge) from 2001:960:800::2" sock_printf() : "tunnel show T25772" sock_getline() : "201 Showing tunnel information for T25772" sock_getline() : "TunnelId: T25772" sock_getline() : "Type: 6in4-heartbeat" sock_getline() : "IPv6 Endpoint: 2001:1620:f00:1::2" sock_getline() : "IPv6 POP: 2001:1620:f00:1::1" sock_getline() : "IPv6 PrefixLength: 64" sock_getline() : "Tunnel MTU: 1280" sock_getline() : "Tunnel Name: Home 2" sock_getline() : "POP Id: chzrh02" sock_getline() : "IPv4 Endpoint: heartbeat" sock_getline() : "IPv4 POP: 0.0.0.0" sock_getline() : "UserState: enabled" sock_getline() : "AdminState: enabled" sock_getline() : "Password: [removed]" sock_getline() : "Heartbeat_Interval: 60" sock_getline() : "202 Done" Succesfully retrieved tunnel information for T25772 sock_printf() : "QUIT And All That Could Have Been..." Tunnel Information for T25772: POP Id : chzrh02 IPv6 Local : 2001:1620:f00:1::2/64 IPv6 Remote : 2001:1620:f00:1::1/64 Tunnel Type : 6in4-heartbeat Adminstate : enabled Userstate : enabled SIOCGIFFLAGS: No such device SIOCSIFMTU: No such device ioctl: No such device Cannot find device "sixxs" Cannot find device "sixxs" heartbeat_socket() - IPv4 : 127.0.0.1 ioctl: No such device [HB] HEARTBEAT TUNNEL 2001:1620:f00:1::2 sender 1267372731 b513b41201cfba2f7c42a361889ab4c1 [HB] HEARTBEAT TUNNEL 2001:1620:f00:1::2 sender 1267372731 b513b41201cfba2f7c42a361889ab4c1 If this a problem on my end? Thanks for taking a look at this! Kind regards, Philipp