Zainstalowałem http://eko.one.pl/forum/viewtopic.php?pid=21214#p21214,
potem http://eko.one.pl/?p=openwrt-openvpn
Jednak zatrzymuje się na instalacji openvpn:

root@Gargoyle:/tmp$ opkg install --verbosity=3 openvpn
opkg_conf_parse_file: Loading conf file /etc/opkg.conf.
pkg_hash_load_feeds:
pkg_hash_load_status_files:
pkg_info_preinstall_check: Updating file owner list.
pkg_hash_fetch_best_installation_candidate: Best installation candidate for openvpn:
pkg_hash_fetch_best_installation_candidate: apkg=openvpn nprovides=2.
pkg_hash_fetch_best_installation_candidate: Adding openvpn to providers.
pkg_hash_fetch_best_installation_candidate: Adding openvpn to providers.
pkg_hash_fetch_best_installation_candidate: openvpn arch=ar71xx arch_priority=10 version=2.1.4.
pkg_hash_fetch_best_installation_candidate: openvpn arch=ar71xx arch_priority=10 version=2.1.3.
pkg_hash_fetch_best_installation_candidate: openvpn arch=ar71xx arch_priority=10 version=2.1.4.
pkg_hash_fetch_best_installation_candidate: openvpn arch=ar71xx arch_priority=10 version=2.1.3.
pkg_hash_fetch_best_installation_candidate: Candidate: openvpn 2.1.3.
pkg_hash_fetch_best_installation_candidate: Candidate: openvpn 2.1.4.
pkg_hash_fetch_best_installation_candidate: 2 matching pkgs for apkg=openvpn:
pkg_hash_fetch_best_installation_candidate: openvpn 2.1.3 ar71xx
pkg_hash_fetch_best_installation_candidate: openvpn 2.1.4 ar71xx
pkg_arch_supported: Arch ar71xx (priority 10) supported for pkg openvpn.
Installing openvpn (2.1.4-3) to root...
Downloading http://ecco.selfip.net/backfire/package … r71xx.ipk.
pkg_hash_fetch_best_installation_candidate: Best installation candidate for kmod-tun:
pkg_hash_fetch_best_installation_candidate: apkg=kmod-tun nprovides=3.
pkg_hash_fetch_best_installation_candidate: Adding kmod-tun to providers.
pkg_hash_fetch_best_installation_candidate: Adding kmod-tun to providers.
pkg_hash_fetch_best_installation_candidate: Adding kmod-tun to providers.
pkg_hash_fetch_best_installation_candidate: kmod-tun arch=ar71xx arch_priority=10 version=2.6.32.27.
pkg_hash_fetch_best_installation_candidate: kmod-tun arch=ar71xx arch_priority=10 version=2.6.32.25.
pkg_hash_fetch_best_installation_candidate: kmod-tun arch=ar71xx arch_priority=10 version=2.6.32.27.
pkg_hash_fetch_best_installation_candidate: kmod-tun arch=ar71xx arch_priority=10 version=2.6.32.25.
pkg_hash_fetch_best_installation_candidate: kmod-tun arch=ar71xx arch_priority=10 version=2.6.32.27.
pkg_hash_fetch_best_installation_candidate: kmod-tun arch=ar71xx arch_priority=10 version=2.6.32.25.
pkg_hash_fetch_best_installation_candidate: Candidate: kmod-tun 2.6.32.27.
Multiple packages (kmod-tun and kmod-tun) providing same name marked HOLD or PREFER. Using latest.
pkg_hash_fetch_best_installation_candidate: 2 matching pkgs for apkg=kmod-tun:
pkg_hash_fetch_best_installation_candidate: kmod-tun 2.6.32.25 ar71xx
pkg_hash_fetch_best_installation_candidate: kmod-tun 2.6.32.27 ar71xx
pkg_hash_fetch_unsatisfied_dependencies: satisfying_pkg=0x445e30
pkg_hash_fetch_best_installation_candidate: Best installation candidate for libopenssl:
pkg_hash_fetch_best_installation_candidate: apkg=libopenssl nprovides=2.
pkg_hash_fetch_best_installation_candidate: Adding libopenssl to providers.
pkg_hash_fetch_best_installation_candidate: Adding libopenssl to providers.
pkg_hash_fetch_best_installation_candidate: libopenssl arch=ar71xx arch_priority=10 version=0.9.8p.
pkg_hash_fetch_best_installation_candidate: libopenssl arch=ar71xx arch_priority=10 version=0.9.8p.
pkg_hash_fetch_best_installation_candidate: Using latest matching libopenssl 0.9.8p ar71xx.
pkg_hash_fetch_unsatisfied_dependencies: satisfying_pkg=(nil)
pkg_hash_fetch_best_installation_candidate: Best installation candidate for libopenssl:
pkg_hash_fetch_best_installation_candidate: apkg=libopenssl nprovides=2.
pkg_hash_fetch_best_installation_candidate: Adding libopenssl to providers.
pkg_hash_fetch_best_installation_candidate: Adding libopenssl to providers.
pkg_hash_fetch_best_installation_candidate: libopenssl arch=ar71xx arch_priority=10 version=0.9.8p.
pkg_hash_fetch_best_installation_candidate: libopenssl arch=ar71xx arch_priority=10 version=0.9.8p.
pkg_hash_fetch_best_installation_candidate: Candidate: libopenssl 0.9.8p.
pkg_hash_fetch_unsatisfied_dependencies: satisfying_pkg=0x560d38
pkg_hash_fetch_best_installation_candidate: Best installation candidate for zlib:
pkg_hash_fetch_best_installation_candidate: apkg=zlib nprovides=2.
pkg_hash_fetch_best_installation_candidate: Adding zlib to providers.
pkg_hash_fetch_best_installation_candidate: Adding zlib to providers.
pkg_hash_fetch_best_installation_candidate: zlib arch=ar71xx arch_priority=10 version=1.2.3.
pkg_hash_fetch_best_installation_candidate: zlib arch=ar71xx arch_priority=10 version=1.2.3.
pkg_hash_fetch_best_installation_candidate: Using latest matching zlib 1.2.3 ar71xx.
pkg_hash_fetch_unsatisfied_dependencies: satisfying_pkg=(nil)
pkg_hash_fetch_best_installation_candidate: Best installation candidate for zlib:
pkg_hash_fetch_best_installation_candidate: apkg=zlib nprovides=2.
pkg_hash_fetch_best_installation_candidate: Adding zlib to providers.
pkg_hash_fetch_best_installation_candidate: Adding zlib to providers.
pkg_hash_fetch_best_installation_candidate: zlib arch=ar71xx arch_priority=10 version=1.2.3.
pkg_hash_fetch_best_installation_candidate: zlib arch=ar71xx arch_priority=10 version=1.2.3.
pkg_hash_fetch_best_installation_candidate: Candidate: zlib 1.2.3.
pkg_hash_fetch_unsatisfied_dependencies: satisfying_pkg=0x62af38
pkg_hash_fetch_best_installation_candidate: Best installation candidate for liblzo:
pkg_hash_fetch_best_installation_candidate: apkg=liblzo nprovides=2.
pkg_hash_fetch_best_installation_candidate: Adding liblzo to providers.
pkg_hash_fetch_best_installation_candidate: Adding liblzo to providers.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.04.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.03.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.04.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.03.
pkg_hash_fetch_best_installation_candidate: 2 matching pkgs for apkg=liblzo:
pkg_hash_fetch_best_installation_candidate: liblzo 2.03 ar71xx
pkg_hash_fetch_best_installation_candidate: liblzo 2.04 ar71xx
pkg_hash_fetch_best_installation_candidate: No matching pkg out of 2 matching_apkgs.
pkg_hash_fetch_unsatisfied_dependencies: satisfying_pkg=(nil)
pkg_hash_fetch_best_installation_candidate: Best installation candidate for liblzo:
pkg_hash_fetch_best_installation_candidate: apkg=liblzo nprovides=2.
pkg_hash_fetch_best_installation_candidate: Adding liblzo to providers.
pkg_hash_fetch_best_installation_candidate: Adding liblzo to providers.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.04.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.03.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.04.
pkg_hash_fetch_best_installation_candidate: liblzo arch=ar71xx arch_priority=10 version=2.03.
pkg_hash_fetch_best_installation_candidate: Candidate: liblzo 2.03.
pkg_hash_fetch_best_installation_candidate: Candidate: liblzo 2.04.
pkg_hash_fetch_best_installation_candidate: 2 matching pkgs for apkg=liblzo:
pkg_hash_fetch_best_installation_candidate: liblzo 2.03 ar71xx
pkg_hash_fetch_best_installation_candidate: liblzo 2.04 ar71xx
pkg_hash_fetch_unsatisfied_dependencies: satisfying_pkg=0x468a78
pkg_arch_supported: Arch ar71xx (priority 10) supported for pkg libopenssl.
Installing libopenssl (0.9.8p-1) to root...
Downloading http://downloads.openwrt.org/backfire/1 … r71xx.ipk.
pkg_run_script: Running script /tmp/opkg-qPcDXt/libopenssl-8MuU7c/preinst.
opkg_install_pkg: Installing maintainer scripts.
opkg_install_pkg: Installing data files for libopenssl.
install_data_files: Extracting data files to /.

... i wisi, nawet reboot z innej sesji nie pomaga.
Co jest przyczyną?

Po restarcie i formatowaniu 2GB uSD w E173:

root@Gargoyle:~$ opkg install openvpn
Installing openvpn (2.1.4-3) to root...
Downloading http://ecco.selfip.net/backfire/package … r71xx.ipk.
Multiple packages (kmod-tun and kmod-tun) providing same name marked HOLD or PREFER. Using latest.
Installing libopenssl (0.9.8p-1) to root...
Downloading http://downloads.openwrt.org/backfire/1 … r71xx.ipk.
Collected errors:
* wfopen: //usr/lib/opkg/info/libopenssl.control: Input/output error.
* wfopen: /usr/lib/libssl.so.0.9.8: Input/output error.
* wfopen: /usr/lib/libcrypto.so.0.9.8: Input/output error.
* set_flags_from_control: Failed to open No such file or directory: //usr/lib/opkg/info/libopenssl.control.
* pkg_write_filelist: Failed to open //usr/lib/opkg/info/libopenssl.list: Input/output error.
* opkg_install_pkg: Failed to extract data files for libopenssl. Package debris may remain!
* opkg_install_cmd: Cannot install package openvpn.
* opkg_conf_write_status_files: Couldn't close //usr/lib/opkg/status: Input/output error.

root@Gargoyle:~$ logread
Jan  1 01:04:03 Gargoyle user.crit kernel: EXT2-fs error (device sda1): read_block_bitmap: Cannot read block bitmap - block_group = 7, block_bitmap = 229495
......
Jan  1 01:04:04 Gargoyle user.crit kernel: EXT2-fs error (device sda1): read_block_bitmap: Cannot read block bitmap - block_group = 7, block_bitmap = 229495

Jeszcze raz formatować? Nowa karta...

No właśnie nie wiem, co się sypie. Zrobiłem ponownie wszystko wg howto Extroot dla G.
Po restarcie uSD jest ładnie zamontowana, ale już po uruchomieniu są błedy:

Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): ext2_get_inode: unable to read inode block - inode=16052, block=65539
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_lookup: ERR from storage dentry, lookup failed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_delete: negative dentry passed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_release: no private data.
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): ext2_get_inode: unable to read inode block - inode=16052, block=65539
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_lookup: ERR from storage dentry, lookup failed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_delete: negative dentry passed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_release: no private data.
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): ext2_get_inode: unable to read inode block - inode=16052, block=65539
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_lookup: ERR from storage dentry, lookup failed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_delete: negative dentry passed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_release: no private data.
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): ext2_get_inode: unable to read inode block - inode=16052, block=65539
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_lookup: ERR from storage dentry, lookup failed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_delete: negative dentry passed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_release: no private data.
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): ext2_get_inode: unable to read inode block - inode=88213, block=360452
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_lookup: ERR from storage dentry, lookup failed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_delete: negative dentry passed.
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo_d_release: no private data.
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): ext2_get_inode: unable to read inode block - inode=88198, block=360451
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): read_block_bitmap: Cannot read block bitmap - block_group = 11, block_bitmap = 360448
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): read_inode_bitmap: Cannot read inode bitmap - block_group = 11, inode_bitmap = 360449
Jan  1 01:33:25 Gargoyle user.crit kernel: EXT2-fs error (device sda1): read_inode_bitmap: Cannot read inode bitmap - block_group = 11, inode_bitmap = 360449
Jan  1 01:33:25 Gargoyle user.crit kernel: mini_fo: create_sto_file: ERROR creating sto file.
Jan  1 01:33:33 Gargoyle user.warn kernel: ipt_bandwidth: timezone shift detected, adjusting

Jak się tego pozbyć? Jakaś niekompatybilność?

Podłączyłem modem i pendrive przez hub'a do routera - efekt dokładnie taki sam jak poprzednio.
Jeśli szkodzi mu 'pojawiam się i znikam', to by wiele wyjaśniało, bo jak uruchamiam router po extroot'cie to żeby połączył się modem robię mu off/on na porcie USB:
echo 0 > /sys/devices/virtual/gpio/gpio6/value, potem echo 1 > /sys/devices/virtual/gpio/gpio6/value.
Jak zrobić autoconnect po restarcie bez tego zabiegu z usb, może to jest źródłem wszelkich nieszczęść?

oki, dotarło.
Jak uzyskać połączenie automatycznie po restarcie routera?

Urządzenie będzie daleko ode mnie i założenie jest takie, że jak nastąpi restart routera z dowolnego powody albo zerwanie łącza np chwilowy brak prądu, to połączenie zostanie wznowione, co więcej połączy się po openvpn.
Chciałem puścić crona, który sprawdzałby co 30min czy jest ping do serwera vpn, jak nie ma to robi restart albo routera albo samego modemu.
off/on usb wydał mi się idealny, ale to było wtedy jak jeszcze nie myślałem o extroot, potem byłem już tak zafiksowany tym podejściem, że nie przewidziałem wszystkich konsekwencji takiego działania.

A jak jest od na "Jak uzyskać połączenie automatycznie po restarcie routera"? Po restarcie nie łączy się automatycznie do sieci.