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_posts/2018-04-04-openwrt-on-the-dg834gv4.md

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+---
+title: OpenWrt on the DG834Gv4 modem router
+tags: [openwrt, modem, router]
+updated: 2018-04-04 13:00
+description: Attempt to repair my first PC and part inventory
+---
+
+# Overview
+
+The [DG834Gv4](https://wikidevi.com/wiki/Netgear_DG834Gv4) is an old 
+*Netgear* WiFi modem/router and has been the main and only wireless access 
+point available to me. Years have passed and this hardware shows signs 
+of its age. Also, when using it as a DSL modem, it sometimes disconnected 
+because of the heat it generates. It was time to decommision it.
+
+In the meantime someone discovered a nice 
+[backdoor](https://github.com/elvanderb/TCP-32764) 
+[feature](https://wikidevi.com/wiki/TCP-32764) including the DG834Gv4.
+One more reason not to use it.
+
+
+# Proc
+
+- [Follow the instuctions](https://openwrt.org/toh/netgear/dg834g.v4?s[]=dg834gv4) reported on the OpenWrt wiki
+  but intead of getting Chaos Calamer get Attitude Adjustment.
+
+- Change root password via luci
+- Enter ssh and
+
+    /etc/init.d/uhttpd stop
+    /etc/init.d/uhttpd disable
+    opkg remove --autoremove uci uhttpd
+
+## Network and device configuration.
+
+    root@OpenWrt:~# cat /etc/config/wireless
+    config wifi-device  radio0
+        option type     'mac80211'
+        option macaddr  '<router_s MAC address here>'
+        option hwmode   '11g'
+        option channel '<channel>'
+        option country '<region>'
+        option txpower '20'
+
+        # REMOVE THIS LINE TO ENABLE WIFI:
+        option disabled '0'
+
+
+    config wifi-iface
+        option device   'radio0'
+        option network  'lan'
+        option mode     'ap'
+        option encryption    'psk2+aes'
+        option key      '<your key here>'
+        option ssid     '<your SSID here'
+
+    root@OpenWrt:~# cat /etc/config/network
+
+    config interface 'loopback'
+        option ifname 'lo'
+        option proto 'static'
+        option ipaddr '127.0.0.1'
+        option netmask '255.0.0.0'
+
+    config interface 'lan'
+        option ifname 'eth0'
+        option type 'bridge'
+        option proto 'static'
+        option ipaddr '<router_s address>'
+        option netmask '<router_s netmask>'
+
+
+## Attempt 1
+
+### Problems
+
+- Not enough memory to install anything even after killing several processes.
+
+    route add default gateway 192.168.0.1 netmask 0.0.0.0 metric 0
+    echo "nameserver 8.8.8.8" > /etc/resolv.conf
+
+    root@OpenWrt:~# opkg install sshfs
+      Installing sshfs (2.2-1) to root...
+      Downloading http://downloads.openwrt.org/attitude_adjustment/12.09/brcm63xx/generic/packages/sshfs_2.2-1_brcm63xx.ipk.      
+      Collected errors:
+         * gz_open: fork: Cannot allocate memory.
+         * opkg_install_pkg: Failed to unpack control files from /tmp/opkg-Ry3bvT/sshfs_2.2-1_brcm63xx.ipk.
+         * opkg_install_cmd: Cannot install package sshfs.
+
+- WiFi seems less powerful than it should be. This is quite disappointing.
+
+
+## Attempt 2
+
+Will include patching the original netgear firmware by removing the `sgfmgr` 
+file and boot line.
+
+