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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SNIProxy 绑定设备后连接超时

edgerouter lite

我之前是tun模式的openvpn site-to-site,网络拓扑很简单,local tun <-> remote tun,简单配个ip就行,edgerouter上直接使用interface-route 跳转到local tun就行了。

后来换用了softether,tap模式,于是需要自己配置IP和路由表。我简单地把firewall modify的地址组切到新的设备上,但是之前的 google dns 和 sniproxy 都保留在openvpn侧。但是最近openvpn被查的厉害,ssh也是被盯上了,所以不得不切换设备到 softether 的 tap 上。

测试,发现连接超时。测试使用的域名是 download.oracle.com,解析的ip是 106.187.61.57。

路由上tcpdump

看到的请求却是:

所以。。。加路由吧。

因为公司是固定IP,所以之前配的是 system gateway-address。
这个时候直接配静态路由会报错:

先删后加

注意一下,delete执行完后需要先commit,否则还会报错。

验证一下

如果执行命令前会纠结是否生效,简单 route add 测试一下即可。无比保证vpn的metric比默认网关的大。

另,interface-route + route 的混合模式没测试。

SNIProxy 绑定设备后连接超时 by @sskaje: https://sskaje.me/2017/02/sniproxy-bind-device-connection-timeout/

EdgeRouter PPTP/L2TP Firewall Modify

AUTO_VPN 是我的规则名称
/config/scripts/post-config.d/auto_vpn_fw_modify 需要加执行权限

EdgeRouter PPTP/L2TP Firewall Modify by @sskaje: https://sskaje.me/2017/02/edgerouter-pptpl2tp-firewall-modify/

SoftEther between VPS and UBNT EdgeRouter

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SoftEther between VPS and UBNT EdgeRouter by @sskaje: https://sskaje.me/2017/01/softether-vps-ubnt-edgerouter/

SoftEther Error 13 with HAProxy or SNIProxy

I set up an HAProxy (also tried SNIProxy) on my EdgeRouter, sharing port 443 for internal port forwarding and SoftEther Server on Router.

When I connect to port 443 from another SoftEther Server, I got a Timeout error, my error message was in Simplified Chinese on my Windows box, I googled and found other ppl meet same error, English message like:

Error (Error Code 13):
Time-out occurred during VPN session communication. It is possible the connection from the client to the VPN Server has been disconnected.

In my case, external SE connect to RouterIP:443, HAProxy(SNIProxy) listens on 443 and split SE connections to localhost:24443 which is listened by SoftEther on Router.

Since HAProxy/SNIProxy does not handles UDP packets, I tried to set up an port forwarding for UDP 443, not working.

The only solution is TICK the ‘Disable UDP Acceleration / 禁用 UDP 加速功能功能 / UDP 高速化機能を無効にする’ from:
Manage Virtual Hub -> Manage Cascade Connections -> Edit -> Advanced Settings -> Disable UDP Acceleration

SoftEther Error 13 with HAProxy or SNIProxy by @sskaje: https://sskaje.me/2017/01/softether-error-13-haproxy-sniproxy/