EdgeRouter 策略路由实现分析

最近家里的路由规则越来越复杂,而且越来越好用。正好昨天跟朋友讨论他的家用路由改造方案,所以研究了一下EdgeRouter的策略路由(Policy-based Routing,PBR)的实现。

我家里的路由是EdgeRouter Lite,固件1.9.1.1,这个实现跟固件关系不大。

首先,我们可以参考一下官方的文档:EdgeRouter – Policy-based routing (source address based)

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EdgeRouter 策略路由实现分析 by @sskaje: https://sskaje.me/2017/06/edgerouter-policy-based-routing-analysis/

EdgeRouter + SoftEther Policy-based Routing Error

I have protocol config like

SoftEther TAP device name is tap_se, local ip is 192.168.10.2, remote ip 192.168.10.1.

Internet is connected via pppoe0.

Policy-based routing modified to table 4 route traffic to pppoe0 rather than tap_se.

Check current route table:

In my previous post, I added a softether start-up script in /config/scripts/post-config.d/.
I guess vpnserver is launched after policy-based routing rules been applied, that causes policy-based routing find no device/connected routes for 192.168.10.1, then pppoe0 is picked.

I don’t have any good idea (add custom config template is a good choice, but i’m lazy zzZZ..), just disable and re-enable that route table after router is booted.

EdgeRouter + SoftEther Policy-based Routing Error by @sskaje: https://sskaje.me/2017/06/edgerouter-softether-policy-based-routing-error/

EdgeRouter Policy Based Routing Using DNSMASQ IPSET

之前用SNIProxy按域名区分流量,着实麻烦。尤其是后期发现路由表莫名其妙出问题。

EdgeRouter的Policy Based Routing(PBR)使用的是自带配置语法的firewall modify功能。
官方有两篇教程:
EdgeRouter – Policy-based routing for destination port
EdgeRouter – Policy-based routing (source address based)

第二篇文章顺带提了network-group。之前在配置VPN时,使用过network-group,还比较过使用firewall modify + network-group 与配置一堆interface-route的区别。

而,这里的network-group的实现,使用了netfilter的ipset。Man pages可以看这里,命令在edgerouter上也附带了。

dnsmasq支持 ‘–ipset‘ 参数,把对配置域名解析的IP存入到指定的ipset。具体细节可以看dnsmasq的文档

dnsmasq配置的语法比较简单。

domain 部分参考 address 的语法。例如:

配置好所有自己需要的域名,重启dnsmasq即可。

ipset本身支持timeout,但是edge os的network-group不支持,所以在配置dnsmasq之前,最好创建一个新的network-group。

假定新建的ipset名叫 MY_SET,edge router的主要相关配置如下:

其他诸如配置 static table, interface firewall 可以参考最前边的文档。

EdgeRouter Policy Based Routing Using DNSMASQ IPSET by @sskaje: https://sskaje.me/2017/04/edgerouter-policy-based-routing-dnsmasq-ipset/

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