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OpenWrt配置无线客户端接口：

config 'interface' 'wisp'
    option 'proto' 'dhcp'

无线配置一客户端+一AP：

#https://www.haiyun.me
config 'wifi-device' 'radio0'
    option 'type' 'mac80211'
    option 'channel' '5'
    option 'macaddr' '00:1f:a3:65:55:8e'
    option 'hwmode' '11g'
    option 'txpower' '20'
    option 'country' '00'

config 'wifi-iface'
    option 'ssid' 'TD811R'
    option 'encryption' 'psk2'
    option 'device' 'radio0'
    option 'mode' 'sta'
    option 'network' 'wisp'
    option 'key' 'onovps'
    option 'bssid' 'C8:3A:35:02:15:28'

config 'wifi-iface'
    option 'device' 'radio0'
    option 'network' 'lan'
    option 'mode' 'ap'
    option 'ssid' 'OpenWrt'
    option 'encryption' 'psk2'
    option 'key' onovps'

OpenWrt主AP配置：

#https://www.haiyun.me
config 'wifi-device' 'radio0'
    option 'type' 'mac80211'
    option 'channel' '5'
    option 'macaddr' '00:1f:a3:65:55:8e'
    option 'hwmode' '11g'
    option 'txpower' '20'
    option 'country' '00'

config 'wifi-iface'
    option 'device' 'radio0'
    option 'wds' '1'
    option 'network' 'lan'
    option 'mode' 'ap'
    option 'ssid' 'WDS'
    option 'encryption' 'psk2'
    option 'key' 'onovps'

WDS客户端配置参数，需关闭DHCP服务，由主AP分配IP。

config 'wifi-device' 'radio0'
    option 'type' 'mac80211'
    option 'channel' '5'
    option 'macaddr' '00:1f:a3:65:55:8e'
    option 'hwmode' '11g'
    option 'txpower' '20'
    option 'country' '00'

config 'wifi-iface'
    option 'device' 'radio0'
    option 'network' 'lan'
    option 'mode' 'ap'
    option 'ssid' 'OpenWrt'
    option 'encryption' 'psk2'
    option 'key' 'onovps'

config 'wifi-iface'
    option 'device' 'radio0'
    option 'wds' '1'
    option 'bssid' '00:1f:a3:65:55:88'
    option 'network' 'wan'
    option 'mode' 'sta'
    option 'ssid' 'WDS'
    option 'encryption' 'psk2'
    option 'key' 'onovps'

之前有介绍Openwrt下IPID模块的使用及自己编译的Openwrt IPID固件下载，本次记录下编译过程。
Openwrt源码根目录下编辑：

include/netfilter.mk

在ipopt软件包下添加：

$(eval $(call nf_add,IPT_IPOPT,CONFIG_NETFILTER_XT_TARGET_IPID, $(P_XT)xt_IPID))

编辑：

package/iptables/Makefile

在HL下添加：

- IPID

编辑：

package/kernel/modules/netfilter.mk

在TTL下添加：

 - IPID 

下载dev.openwrt.org.cn提供的IPID源码patch：

#https://www.haiyun.me
wget -P package/iptables/patches/ https://dev.openwrt.org.cn/export/553/trunk/package/iptables/patches/006-iptable-ipid.patch
wget -P target/linux/generic-2.6/patches-2.6.32/ https://dev.openwrt.org.cn/export/553/trunk/target/linux/generic/patches-2.6.32/995-netfilter_linux-ipid.patch

修改iptable-ipid.patch第二行为：

+++ b/extensions/libxt_IPID.c

然后编译Openwrt固件，选择IPOPT软件包即可。

使用Openwrt官方源最新稳定版编译，添加IPID/TTL模块，适用于RG100AA和DB120。
linux内核版本：

Linux OpenWrt 2.6.32.27 #2 Fri Sep 14 17:12:10 CST 2012 mips GNU/Linux

编译安装的软件如下：

opkg list-installed
base-files - 43.35-r33081
bash - 4.2-2
busybox - 1.15.3-3.4
crda - 1.1.1-1
ddns-scripts - 1.0.0-18
dnsmasq - 2.55-6.1
dropbear - 0.53.1-6
gpioctl - 1.0-1
hotplug2 - 1.0-beta-3
ip - 2.6.29-1-2
iptables - 1.4.6-3.1
iptables-mod-conntrack - 1.4.6-3.1
iptables-mod-conntrack-extra - 1.4.6-3.1
iptables-mod-extra - 1.4.6-3.1
iptables-mod-filter - 1.4.6-3.1
iptables-mod-hashlimit - 1.4.6-3.1
iptables-mod-imq - 1.4.6-3.1
iptables-mod-ipopt - 1.4.6-3.1
iptables-mod-ipsec - 1.4.6-3.1
iptables-mod-nat - 1.4.6-3.1
iptables-mod-nat-extra - 1.4.6-3.1
iw - 0.9.22-2
kernel - 2.6.32.27-1
kmod-b43 - 2.6.32.27+2011-12-01-1
kmod-cfg80211 - 2.6.32.27+2011-12-01-1
kmod-crc-ccitt - 2.6.32.27-1
kmod-crypto-aes - 2.6.32.27-1
kmod-crypto-arc4 - 2.6.32.27-1
kmod-crypto-core - 2.6.32.27-1
kmod-fs-ext3 - 2.6.32.27-1
kmod-fs-ntfs - 2.6.32.27-1
kmod-fs-vfat - 2.6.32.27-1
kmod-ipt-conntrack - 2.6.32.27-1
kmod-ipt-conntrack-extra - 2.6.32.27-1
kmod-ipt-core - 2.6.32.27-1
kmod-ipt-extra - 2.6.32.27-1
kmod-ipt-filter - 2.6.32.27-1
kmod-ipt-hashlimit - 2.6.32.27-1
kmod-ipt-imq - 2.6.32.27-1
kmod-ipt-ipopt - 2.6.32.27-1
kmod-ipt-ipsec - 2.6.32.27-1
kmod-ipt-nat - 2.6.32.27-1
kmod-ipt-nat-extra - 2.6.32.27-1
kmod-mac80211 - 2.6.32.27+2011-12-01-1
kmod-macvlan - 2.6.32.27-1
kmod-nls-base - 2.6.32.27-1
kmod-nls-cp437 - 2.6.32.27-1
kmod-nls-iso8859-1 - 2.6.32.27-1
kmod-nls-utf8 - 2.6.32.27-1
kmod-ppp - 2.6.32.27-1
kmod-pppoe - 2.6.32.27-1
kmod-sched - 2.6.32.27-1
kmod-scsi-core - 2.6.32.27-1
kmod-switch - 2.6.32.27-4
kmod-textsearch - 2.6.32.27-1
kmod-usb-core - 2.6.32.27-1
kmod-usb-ohci - 2.6.32.27-1
kmod-usb-storage - 2.6.32.27-1
kmod-usb2 - 2.6.32.27-1
l7-protocols - 2009-05-28-1
libc - 0.9.30.1-43.35
libevent2 - 2.0.16-1
libgcc - 4.3.3+cs-43.35
libip4tc - 1.4.6-3.1
libiwinfo - 18.2
libiwinfo-lua - 18.2
liblua - 5.1.4-7
libncurses - 5.7-2
libnl-tiny - 0.1-2.1
libopenssl - 0.9.8x-1
libpcap - 1.0.0-2
libpthread - 0.9.30.1-43.35
librt - 0.9.30.1-43.35
libuci - 12012009.7-4
libuci-lua - 12012009.7-4
libxtables - 1.4.6-3.1
lrzsz - 0.12.20-2
lua - 5.1.4-7
luci-app-ddns - 0.10+svn9273-1
luci-i18n-chinese - 0.10+svn9273-1
luci-i18n-english - 0.10+svn9273-1
luci-lib-core - 0.10+svn9273-1
luci-lib-ipkg - 0.10+svn9273-1
luci-lib-lmo - 0.10+svn9273-1
luci-lib-nixio - 0.10+svn9273-1
luci-lib-sys - 0.10+svn9273-1
luci-lib-web - 0.10+svn9273-1
luci-mod-admin-core - 0.10+svn9273-1
luci-mod-admin-full - 0.10+svn9273-1
luci-proto-core - 0.10+svn9273-1
luci-proto-ppp - 0.10+svn9273-1
luci-sgi-cgi - 0.10+svn9273-1
luci-sgi-uhttpd - 0.10+svn9273-1
luci-theme-base - 0.10+svn9273-1
luci-theme-openwrt - 0.10+svn9273-1
mtd - 13
openssh-client - 5.9p1-4
opkg - 576-2
ppp - 2.4.4-16.1
ppp-mod-pppoe - 2.4.4-16.1
tc - 2.6.29-1-2
tcpdump - 4.1.1-2
tmux - 1.6-2
uci - 12012009.7-4
udevtrigger - 106-1
uhttpd - 28.1
uhttpd-mod-lua - 28.1
wireless-tools - 29-4
wpad-mini - 20111103-3
zlib - 1.2.3-5

IPID及TTL使用参数参考：Openwrt/Linux使用IPID和TTL模块防网络尖兵。

OpenWRT安装bash及bash-completion：

#https://www.haiyun.me
opkg update
opkg install bash-completion

更改用户shell为bash：

cat /etc/passwd 
root:AABBBDDDdDDDDDDDDDD42fmHU/:0:0:root:/root:/bin/bash

配置bash-completion命令参数补全：

echo '. /etc/bash_completion' >> /etc/bashrc

在使用命令补全时如出现以下错误：

-bash: /dev/fd/60: No such file or directory

创建/dev/fd链接：

ln -s /proc/self/fd /dev/fd