openwrt上网配置的一些理解（三）

接着上面的继续捣腾multiwan，首先考虑一下上一篇中记录的multiwan配置，这里的配置是否正确，得研究一下。先贴一下上一篇的配置文件，如下：

config 'multiwan' 'config'
    option 'default_route' 'balancer'
    # health_monitor below is defaulted to parallel, and can be set to
    # serial to save system resources.
    # option 'health_monitor' 'serial'
    # option 'debug' '1'

config 'interface' 'wan'
    option 'weight' '1'
    option 'health_interval' '10'
    option 'icmp_hosts' 'gateway'
    # icmp_count is defaulted to 1, and can be increased to reduce
    # false positives.
    # option 'icmp_count' '3'
    option 'timeout' '3'
    option 'health_fail_retries' '3'
    option 'health_recovery_retries' '5'
    option 'failover_to' 'wan1'
    option 'dns' 'auto'

config 'interface' 'wan1'
    option 'weight' '1'
    option 'health_interval' '10'
    option 'icmp_hosts' 'gateway'
    option 'timeout' '3'
    option 'health_fail_retries' '3'
    option 'health_recovery_retries' '5'
    option 'failover_to' 'wan2'
    option 'dns' 'auto'

config 'interface' 'wan2'
    option 'weight' '1'
    option 'health_interval' '10'
    option 'icmp_hosts' 'gateway'
    option 'timeout' '3'
    option 'health_fail_retries' '3'
    option 'health_recovery_retries' '5'
    option 'failover_to' 'wan'
    option 'dns' 'auto'

#config 'mwanfw'
#    option 'src' '192.168.1.0/24'
#    option 'dst' 'ftp.netlab7.com'
#    option 'proto' 'tcp'
#    option 'ports' '21'
#    option 'wanrule' 'lan'

# VoIP traffic goes through wan
# config 'mwanfw'
    # option 'src' '192.168.1.0/24'
    # option 'proto' 'udp'
    # option 'port_type' 'source-ports'
    # option 'ports' '5060,16384:16482'
    # option 'wanrule' 'wan'

config 'mwanfw'
#    option 'src' '192.168.0.3'
#    option 'proto' 'icmp'
    option 'wanrule' 'balancer'

config 'mwanfw'
#    option 'dst' 'www.whatismyip.com'
    option 'wanrule' 'fastbalancer'

还是在网上找找有没有相关人士做过这个：

http://www.openwrt.org.cn/bbs/forum.php?mod=viewthread&tid=9848&extra=&page=1实验多WAN带宽叠加——Multiwan篇

这个帖子做实验很严谨，于是我跟着做了跟我网络环境对应的实验，发现确实是不行的。当然根据帖子我把multiwan修改了，就是把failover_to全部修改成balancer。但是还是不行。后来我在http://wiki.openwrt.org/doc/uci/multiwan看到这么一句话：Note: Multiwan will NOT work if the WAN connections are on the same subnet and share the same default gateway.

我的是啥情况：用一张图来说明我的网络。

3个wan口，全部连上时，都会走eth1，也就是wan口，拔掉wan口网线，ping 百度不通，ping219.245.65.89可以回来一个数据，然后停止。很明显没有自动切换，但是不知道有没有叠加，其实我不关心叠不叠加，我只关心我随便插哪个，他就用哪个，我是要确保网络畅通。所以还得继续想办法。

根据帖子的内容我又进一步了解了下ip route。结果如下：

ip route show table 170
192.168.2.0/24 dev br-lan    proto kernel    scope    link      src    192.168.2.1
192.168.1.0/24 dev eth2     proto kernel     scope    link     src  192.168.1.247
default    proto    static
    nexthop    via    192.168.1.1    dev    eth1    weight    1
    nexthop     via     192.168.1.1    dev    eth2 weight    1
    nexthop     via     192.168.1.1    dev    eth3 weight    1
ip route show table    171
192.168.2.0/24    dev    br-lan    proto    kernel    scope    link    src    192.168.2.1
192.168.1.0/24    dev    eth1        proto    kernel    scope    link    src    192.168.1.247
Default    via    192.168.1.1    dev    eth1    proto    static    src    192.168.1.247
ip route show table 172
192.168.2.0/24    dev    br-lan    proto    kernel    scope    link    src    192.168.2.1
192.168.1.0/24    dev    eth1        proto    kernel    scope    link    src    192.168.1.247
Default    via    192.168.1.1    dev    eth1    proto    static    src    192.168.1.248
ip route show table 173
192.168.2.0/24    dev    br-lan    proto    kernel    scope    link    src    192.168.2.1
192.168.1.0/24    dev    eth1        proto    kernel    scope    link    src    192.168.1.247
Default    via    192.168.1.1    dev    eth1    proto    static    src    192.168.1.249

就是都会往eth1走，所以，把wan拔了肯定就有问题。回去检查了下multiwan，因为这个文件还是上一次的，只是根据这个帖子修改了failover_to，都改成balancer了，那么再看看这个帖子：http://www.openwrt.org.cn/bbs/forum.php?mod=viewthread&tid=14861&page=1&extra=#pid108970

里面multiwan的第一项中，我少了个option enabled 1.加上一试，还真是，我拿luci界面进行3个wan口的connect和stop。发现可以了，我把任意两个关了，还是可以上网。那就满足我的要求了，不过还是要研究一下luci界面机制。还是记录一下multiwan。

config 'multiwan' 'config'
    option 'default_route' 'balancer'
    # health_monitor below is defaulted to parallel, and can be set to
    # serial to save system resources.
    # option 'health_monitor' 'serial'
    option 'enabled' '1'

config 'interface' 'wan'
    option 'weight' '1'
    option 'health_interval' '10'
    option 'icmp_hosts' 'gateway'
    # icmp_count is defaulted to 1, and can be increased to reduce
    # false positives.
    # option 'icmp_count' '3'
    option 'timeout' '3'
    option 'health_fail_retries' '3'
    option 'health_recovery_retries' '5'
    option 'failover_to' 'balancer'
    option 'dns' 'auto'

config 'interface' 'wan1'
    option 'weight' '1'
    option 'health_interval' '10'
    option 'icmp_hosts' 'gateway'
    option 'timeout' '3'
    option 'health_fail_retries' '3'
    option 'health_recovery_retries' '5'
    option 'failover_to' 'balancer'
    option 'dns' 'auto'

config 'interface' 'wan2'
    option 'weight' '1'
    option 'health_interval' '10'
    option 'icmp_hosts' 'gateway'
    option 'timeout' '3'
    option 'health_fail_retries' '3'
    option 'health_recovery_retries' '5'
    option 'failover_to' 'balancer'
    option 'dns' 'auto'

#config 'mwanfw'
#    option 'src' '192.168.1.0/24'
#    option 'dst' 'ftp.netlab7.com'
#    option 'proto' 'tcp'
#    option 'ports' '21'
#    option 'wanrule' 'lan'

# VoIP traffic goes through wan
# config 'mwanfw'
    # option 'src' '192.168.1.0/24'
    # option 'proto' 'udp'
    # option 'port_type' 'source-ports'
    # option 'ports' '5060,16384:16482'
    # option 'wanrule' 'wan'

config 'mwanfw'
#    option 'src' '192.168.0.3'
#    option 'proto' 'icmp'
    option 'wanrule' 'balancer'

config 'mwanfw'
#    option 'dst' 'www.whatismyip.com'
    option 'wanrule' 'fastbalancer'

接下来还要把3g上网的也加进来试试。