我是挣扎使用 DD-WRT 的 PPTP 客户端，因为我尝试的所有配置（和构建）都是基于最重要的维基百科而且较旧的论坛帖子也导致没有显示 ppp0 连接ifconfig。（那里 是远程 VPN 服务器的公共 IP 连接显示在 vlan2 上route。见下文。）现在，我只需从我的 Mac 上获取打开和关闭连接的完整详细日志，效果很好。（我屏蔽了服务器的地址。）我应该为 DD-WRT 指定哪些地址才能在我的计算机上看到远程 LAN 的私有 IP（但连接的是路由器，而不是计算机）？如果常规流量不通过 VPN 路由，那就更好了。
我确实担心 DD-WRT 版本会损坏，但我尝试了很多版本，却没有找到关于哪个版本可以运行这些功能的确切信息。（我需要一个 PPTP 服务器来接收传入连接，然后通过 PPTP 客户端再次路由出去。硬件是 Linksys e900，所以我无法在版本之间回溯太远。）
Tue Jul 15 21:57:48 2014 : publish_entry SCDSet() failed: Success!
Tue Jul 15 21:57:48 2014 : publish_entry SCDSet() failed: Success!
Tue Jul 15 21:57:48 2014 : PPTP connecting to server 'VPN-SERVER-DOMAIN-NAME' (VPN.SERVER.IP.ADDRESS)...
Tue Jul 15 21:57:48 2014 : PPTP connection established.
Tue Jul 15 21:57:48 2014 : PPTP set port-mapping for en0, interface: 4, protocol: 0, privatePort: 0
Tue Jul 15 21:57:48 2014 : using link 0
Tue Jul 15 21:57:48 2014 : Using interface ppp0
Tue Jul 15 21:57:48 2014 : Connect: ppp0 <--> socket[34:17]
Tue Jul 15 21:57:48 2014 : sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x4f8a4883> <pcomp> <accomp>]
Tue Jul 15 21:57:48 2014 : rcvd [LCP ConfReq id=0x0 <mru 1400> <auth eap> <magic 0x14c3361a> <pcomp> <accomp> <callback CBCP> <mrru 1614> <endpoint 13 17 01 4c 08 dc fd b1 13 4f 36 97 16 78 b7 c5 fe fb 5a 00 00 00 00> < 17 04 14 d5>]
Tue Jul 15 21:57:48 2014 : lcp_reqci: rcvd unknown option 13
Tue Jul 15 21:57:48 2014 : lcp_reqci: rcvd unknown option 23
Tue Jul 15 21:57:48 2014 : lcp_reqci: returning CONFREJ.
Tue Jul 15 21:57:48 2014 : sent [LCP ConfRej id=0x0 <callback CBCP> <mrru 1614> < 17 04 14 d5>]
Tue Jul 15 21:57:48 2014 : rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x4f8a4883> <pcomp> <accomp>]
Tue Jul 15 21:57:48 2014 : rcvd [LCP ConfReq id=0x1 <mru 1400> <auth eap> <magic 0x14c3361a> <pcomp> <accomp> <endpoint 13 17 01 4c 08 dc fd b1 13 4f 36 97 16 78 b7 c5 fe fb 5a 00 00 00 00>]
Tue Jul 15 21:57:48 2014 : lcp_reqci: returning CONFNAK.
Tue Jul 15 21:57:48 2014 : sent [LCP ConfNak id=0x1 <auth chap MS-v2>]
Tue Jul 15 21:57:48 2014 : rcvd [LCP ConfReq id=0x2 <mru 1400> <auth chap MS-v2> <magic 0x14c3361a> <pcomp> <accomp> <endpoint 13 17 01 4c 08 dc fd b1 13 4f 36 97 16 78 b7 c5 fe fb 5a 00 00 00 00>]
Tue Jul 15 21:57:48 2014 : lcp_reqci: returning CONFACK.
Tue Jul 15 21:57:48 2014 : sent [LCP ConfAck id=0x2 <mru 1400> <auth chap MS-v2> <magic 0x14c3361a> <pcomp> <accomp> <endpoint 13 17 01 4c 08 dc fd b1 13 4f 36 97 16 78 b7 c5 fe fb 5a 00 00 00 00>]
Tue Jul 15 21:57:48 2014 : sent [LCP EchoReq id=0x0 magic=0x4f8a4883]
Tue Jul 15 21:57:48 2014 : rcvd [CHAP Challenge id=0x0 <c21f7ac19090fa400ed060d6e085324d>, name = "IFNFS01"]
Tue Jul 15 21:57:48 2014 : sent [CHAP Response id=0x0 <0e07edf42cd3adcc49bb73bb183f0433000000000000000088b7aed8c5259c14c2429637f999770628b91d58e5a3951f00>, name = "laszlos"]
Tue Jul 15 21:57:48 2014 : rcvd [LCP EchoRep id=0x0 magic=0x14c3361a]
Tue Jul 15 21:57:49 2014 : rcvd [CHAP Success id=0x0 "S=8B21C8FD6BB8DD40CBF438D2085F4EB0337398C3"]
Tue Jul 15 21:57:49 2014 : sent [CCP ConfReq id=0x1 <mppe +H -M +S +L -D -C>]
Tue Jul 15 21:57:49 2014 : rcvd [CCP ConfReq id=0x4 <mppe +H -M -S -L -D +C>]
Tue Jul 15 21:57:49 2014 : sent [CCP ConfNak id=0x4 <mppe +H -M +S +L -D -C>]
Tue Jul 15 21:57:49 2014 : rcvd [IPCP ConfReq id=0x5 <addr 192.168.77.200>]
Tue Jul 15 21:57:49 2014 : sent [IPCP TermAck id=0x5]
Tue Jul 15 21:57:49 2014 : rcvd [CCP ConfNak id=0x1 <mppe +H -M +S -L -D -C>]
Tue Jul 15 21:57:49 2014 : sent [CCP ConfReq id=0x2 <mppe +H -M +S -L -D -C>]
Tue Jul 15 21:57:49 2014 : rcvd [CCP ConfReq id=0x6 <mppe +H -M +S -L -D -C>]
Tue Jul 15 21:57:49 2014 : sent [CCP ConfAck id=0x6 <mppe +H -M +S -L -D -C>]
Tue Jul 15 21:57:49 2014 : rcvd [CCP ConfAck id=0x2 <mppe +H -M +S -L -D -C>]
Tue Jul 15 21:57:49 2014 : MPPE 128-bit stateless compression enabled
Tue Jul 15 21:57:49 2014 : sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
Tue Jul 15 21:57:49 2014 : sent [IPV6CP ConfReq id=0x1 <addr fe80::129a:ddff:fe6c:6cce>]
Tue Jul 15 21:57:49 2014 : rcvd [IPCP ConfRej id=0x1 <ms-dns3 0.0.0.0>]
Tue Jul 15 21:57:49 2014 : sent [IPCP ConfReq id=0x2 <addr 0.0.0.0> <ms-dns1 0.0.0.0>]
Tue Jul 15 21:57:49 2014 : rcvd [LCP ProtRej id=0x7 80 57 01 01 00 0e 01 0a 12 9a dd ff fe 6c 6c ce]
Tue Jul 15 21:57:49 2014 : rcvd [IPCP ConfNak id=0x2 <addr 192.168.77.204> <ms-dns1 192.168.77.5>]
Tue Jul 15 21:57:49 2014 : sent [IPCP ConfReq id=0x3 <addr 192.168.77.204> <ms-dns1 192.168.77.5>]
Tue Jul 15 21:57:49 2014 : rcvd [IPCP ConfAck id=0x3 <addr 192.168.77.204> <ms-dns1 192.168.77.5>]
Tue Jul 15 21:57:50 2014 : rcvd [IPCP ConfReq id=0x8 <addr 192.168.77.200>]
Tue Jul 15 21:57:50 2014 : ipcp: returning Configure-ACK
Tue Jul 15 21:57:50 2014 : sent [IPCP ConfAck id=0x8 <addr 192.168.77.200>]
Tue Jul 15 21:57:50 2014 : ipcp: up
Tue Jul 15 21:57:50 2014 : local IP address 192.168.77.204
Tue Jul 15 21:57:50 2014 : remote IP address 192.168.77.200
Tue Jul 15 21:57:50 2014 : primary DNS address 192.168.77.5
Tue Jul 15 21:57:50 2014 : Received protocol dictionaries
Tue Jul 15 21:57:50 2014 : Committed PPP store
Tue Jul 15 21:57:50 2014 : Script /etc/ppp/ip-up started (pid 43217)
Tue Jul 15 21:57:50 2014 : pptp_wait_input: Address added. previous interface setting (name: en0, address: 192.168.1.109), current interface setting (name: ppp0, family: PPP, address: 192.168.77.204, subnet: 255.255.255.0, destination: 192.168.77.200).
Tue Jul 15 21:57:50 2014 : Script /etc/ppp/ip-up finished (pid 43217), status = 0x0
Tue Jul 15 21:57:52 2014 : [DISCONNECT]
Tue Jul 15 21:57:52 2014 : Hangup (SIGHUP)
Tue Jul 15 21:57:52 2014 : ipcp: down
Tue Jul 15 21:57:52 2014 : Script /etc/ppp/ip-down started (pid 43226)
Tue Jul 15 21:57:52 2014 : MPPE disabled
Tue Jul 15 21:57:52 2014 : sent [LCP TermReq id=0x2 "MPPE disabled"]
Tue Jul 15 21:57:52 2014 : Connection terminated.
Tue Jul 15 21:57:52 2014 : sent [LCP TermReq id=0x3 "MPPE disabled"]
Tue Jul 15 21:57:52 2014 : Connect time 0.1 minutes.
Tue Jul 15 21:57:52 2014 : Sent 165818 bytes, received 224926 bytes.
Tue Jul 15 21:57:52 2014 : PPTP disconnecting...
Tue Jul 15 21:57:52 2014 : PPTP clearing port-mapping for en0
Tue Jul 15 21:57:52 2014 : PPTP disconnected
Tue Jul 15 21:57:52 2014 : Waiting for 1 child processes...
Tue Jul 15 21:57:52 2014 : script /etc/ppp/ip-down, pid 43226
Tue Jul 15 21:57:52 2014 : Waiting for 1 child processes...
Tue Jul 15 21:57:52 2014 : script /etc/ppp/ip-down, pid 43226
Tue Jul 15 21:57:52 2014 : Script /etc/ppp/ip-down finished (pid 43226), status = 0x44
Ifconfig 显示路由器上的这些连接：
br0 Link encap:Ethernet HWaddr C8:B3:73:36:CB:52
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::cab3:73ff:fe36:cb52/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8815 errors:0 dropped:0 overruns:0 frame:0
TX packets:8510 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1684278 (1.6 MiB) TX bytes:6085903 (5.8 MiB)
br0:0 Link encap:Ethernet HWaddr C8:B3:73:36:CB:52
inet addr:169.254.255.1 Bcast:169.254.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth0 Link encap:Ethernet HWaddr C8:B3:73:36:CB:50
inet6 addr: fe80::cab3:73ff:fe36:cb50/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:89826 errors:0 dropped:0 overruns:0 frame:0
TX packets:36466 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13007531 (12.4 MiB) TX bytes:16062734 (15.3 MiB)
Interrupt:4 Base address:0x2000
eth1 Link encap:Ethernet HWaddr C8:B3:73:36:CB:52
inet6 addr: fe80::cab3:73ff:fe36:cb52/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:3 Base address:0x1000
imq0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
UP RUNNING NOARP MTU:1500 Metric:1
RX packets:4667 errors:0 dropped:0 overruns:0 frame:0
TX packets:4667 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:30
RX bytes:3466514 (3.3 MiB) TX bytes:3466514 (3.3 MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MULTICAST MTU:65536 Metric:1
RX packets:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1012 (1012.0 B) TX bytes:1012 (1012.0 B)
vlan1 Link encap:Ethernet HWaddr C8:B3:73:36:CB:50
inet6 addr: fe80::cab3:73ff:fe36:cb50/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8817 errors:0 dropped:0 overruns:0 frame:0
TX packets:8520 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1684934 (1.6 MiB) TX bytes:6086811 (5.8 MiB)
vlan2 Link encap:Ethernet HWaddr C8:B3:73:36:CB:51
inet addr:MA.SKED.125.166 Bcast:83.251.127.255 Mask:255.255.240.0
inet6 addr: fe80::cab3:73ff:fe36:cb51/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:81009 errors:0 dropped:1 overruns:0 frame:0
TX packets:27938 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9346425 (8.9 MiB) TX bytes:9829363 (9.3 MiB)
构建和route输出显示在屏幕截图上（IP 屏蔽）。（列表中的第一个 IP 是我在 WAN 上的子网 [即网关是相同的地址，以 1 结尾，而不是 0]。最下面的 IP 是我尝试连接的 VPN 服务器的公共 IP，并且 Mac 确实连接到了该服务器，即使是在完全相同的 WAN 上的路由器后面。）
以下是主要 PPTP VPN 设置（服务器和客户端）的屏幕截图，以便于查看。
无论如何，这是我的主要路由器设置。（我省去了 DDNS，它确实有效，我使用它的域名从远处找到了我的路由器。我也省去了你的 WAN 和 LAN 状态。）
