Debian
Debian 伺服器 + PPTP VPN - 連接不工作
我在我的家庭網路中設置了一個帶有 Debian Squeeze 的 Seagate DockStar 作為小型伺服器。我現在想從我自己的網路外部訪問它，所以我需要一個 VPN 連接。順便說一句，我沒有帶有集成 VPN 伺服器的路由器。我已經有一個“大”的 Windows XP 伺服器正在執行，我可以通過 PPTP VPN 隧道訪問它。這很容易，但現在使用 Debian，我在設置 VPN 連接時遇到了一些問題。
我通過安裝 pptpd
apt-get install pptpd已經。這是我的 pptpd.conf：
# TAG: ppp # Path to the pppd program, default '/usr/sbin/pppd' on Linux # #ppp /usr/sbin/pppd # TAG: option # Specifies the location of the PPP options file. # By default PPP looks in '/etc/ppp/options' # option /etc/ppp/pptpd-options # TAG: debug # Turns on (more) debugging to syslog # #debug # TAG: stimeout # Specifies timeout (in seconds) on starting ctrl connection # # stimeout 10 # TAG: noipparam # Suppress the passing of the client's IP address to PPP, which is # done by default otherwise. # #noipparam # TAG: logwtmp # Use wtmp(5) to record client connections and disconnections. # logwtmp # TAG: bcrelay <if> # Turns on broadcast relay to clients from interface <if> # #bcrelay eth1 # TAG: localip # TAG: remoteip # Specifies the local and remote IP address ranges. # # Any addresses work as long as the local machine takes care of the # routing. But if you want to use MS-Windows networking, you should # use IP addresses out of the LAN address space and use the proxyarp # option in the pppd options file, or run bcrelay. # # You can specify single IP addresses seperated by commas or you can # specify ranges, or both. For example: # # 192.168.0.234,192.168.0.245-249,192.168.0.254 # # IMPORTANT RESTRICTIONS: # # 1. No spaces are permitted between commas or within addresses. # # 2. If you give more IP addresses than MAX_CONNECTIONS, it will # start at the beginning of the list and go until it gets # MAX_CONNECTIONS IPs. Others will be ignored. # # 3. No shortcuts in ranges! ie. 234-8 does not mean 234 to 238, # you must type 234-238 if you mean this. # # 4. If you give a single localIP, that's ok - all local IPs will # be set to the given one. You MUST still give at least one remote # IP for each simultaneous client. # # (Recommended) localip 192.168.0.120 remoteip 192.168.0.121-129 # or #localip 192.168.0.234-238,192.168.0.245 #remoteip 192.168.1.234-238,192.168.1.245我在路由器中的 DHCP 伺服器正在分配以 192.168.0.2 開頭的 IP。我的大型伺服器從 192.168.0.121 開始將 IP 分配給 VPN 客戶端（伺服器本身俱有 xxx120 TP）——正如我已經寫過的，在大型伺服器上 VPN 工作，所以我剛剛將 localip 和 remoteip 範圍設置為從大伺服器。
我的 pptpd 選項如下所示：
# Authentication # Name of the local system for authentication purposes # (must match the second field in /etc/ppp/chap-secrets entries) name pptpd # Optional: domain name to use for authentication # domain mydomain.net # Strip the domain prefix from the username before authentication. # (applies if you use pppd with chapms-strip-domain patch) #chapms-strip-domain # Encryption # Debian: on systems with a kernel built with the package # kernel-patch-mppe >= 2.4.2 and using ppp >= 2.4.2, ... # {{{ refuse-pap refuse-chap refuse-mschap # Require the peer to authenticate itself using MS-CHAPv2 [Microsoft # Challenge Handshake Authentication Protocol, Version 2] authentication. require-mschap-v2 # Require MPPE 128-bit encryption # (note that MPPE requires the use of MSCHAP-V2 during authentication) #require-mppe-128 # }}} # Network and Routing # If pppd is acting as a server for Microsoft Windows clients, this # option allows pppd to supply one or two DNS (Domain Name Server) # addresses to the clients. The first instance of this option # specifies the primary DNS address; the second instance (if given) # specifies the secondary DNS address. # Attention! This information may not be taken into account by a Windows # client. See KB311218 in Microsoft's knowledge base for more information. #ms-dns 10.0.0.1 #ms-dns 10.0.0.2 # If pppd is acting as a server for Microsoft Windows or "Samba" # clients, this option allows pppd to supply one or two WINS (Windows # Internet Name Services) server addresses to the clients. The first # instance of this option specifies the primary WINS address; the # second instance (if given) specifies the secondary WINS address. #ms-wins 10.0.0.3 #ms-wins 10.0.0.4 # Add an entry to this system's ARP [Address Resolution Protocol] # table with the IP address of the peer and the Ethernet address of this # system. This will have the effect of making the peer appear to other # systems to be on the local ethernet. # (you do not need this if your PPTP server is responsible for routing # packets to the clients -- James Cameron) proxyarp # Debian: do not replace the default route nodefaultroute # Logging # Enable connection debugging facilities. # (see your syslog configuration for where pppd sends to) #debug # Print out all the option values which have been set. # (often requested by mailing list to verify options) #dump # Miscellaneous # Create a UUCP-style lock file for the pseudo-tty to ensure exclusive # access. lock # Disable BSD-Compress compression nobsdcomp ms-dns 192.168.0.1 netmask 255.255.255.0 noipx mtu 1490 mru 1490在 chap-secrets 文件中，我註冊了一個使用者。（如下所示：- 這是對的嗎？）
*netstat 告訴我埠 1723 已打開並被 pptpd 監聽，以及來自另一台電腦的 nmap 埠掃描。DockStar 上沒有安裝 iptables。在我的路由器中，我將每個 TCP 或 UDP 連接轉發到埠 1723 到 DockStar 的 IP。
我嘗試連接 Windows XP、Windows 7 和 Mac OS X 客戶端。所有人都無法建立連接。Mac OS X 僅顯示一般錯誤消息，Windows 客戶端顯示“錯誤 619 - 無法建立與遠端電腦的連接。”。客戶端配置為使用 MSCHAPv2，並在 chap-secrets 文件中設置使用者名和密碼。
如果我嘗試從同一網路中的筆記型電腦或通過我的 WWAN 連接（當 WiFi 關閉時）連接到伺服器並不重要 - 每次我嘗試連接時它都不起作用。
有誰知道伺服器的配置有什麼問題並且知道如何讓它工作？
提前致謝，
亞辛*
*好吧，我的 Debian 安裝上確實沒有安裝日誌服務。現在我安裝了 rsyslog，所以當我嘗試使用我的 Windows 7 電腦通過 PPTP 連接到 VPN 伺服器時，這裡是寫入 /var/log/syslog 的日誌：
Oct 17 20:05:57 debian pptpd[769]: MGR: Launching /usr/sbin/pptpctrl to handle client Oct 17 20:05:57 debian pptpd[769]: CTRL: local address = 192.168.1.1 Oct 17 20:05:57 debian pptpd[769]: CTRL: remote address = 192.168.2.1 Oct 17 20:05:57 debian pptpd[769]: CTRL: pppd options file = /etc/ppp/pptpd-options Oct 17 20:05:57 debian pptpd[769]: CTRL: Client 192.168.0.7 control connection started Oct 17 20:05:57 debian pptpd[769]: CTRL: Received PPTP Control Message (type: 1) Oct 17 20:05:57 debian pptpd[769]: CTRL: Made a START CTRL CONN RPLY packet Oct 17 20:05:57 debian pptpd[769]: CTRL: I wrote 156 bytes to the client. Oct 17 20:05:57 debian pptpd[769]: CTRL: Sent packet to client Oct 17 20:05:57 debian pptpd[769]: CTRL: Received PPTP Control Message (type: 7) Oct 17 20:05:57 debian pptpd[769]: CTRL: Set parameters to 100000000 maxbps, 64 window size Oct 17 20:05:57 debian pptpd[769]: CTRL: Made a OUT CALL RPLY packet Oct 17 20:05:57 debian pptpd[769]: CTRL: Starting call (launching pppd, opening GRE) Oct 17 20:05:57 debian pptpd[769]: CTRL: pty_fd = 6 Oct 17 20:05:57 debian pptpd[769]: CTRL: tty_fd = 7 Oct 17 20:05:57 debian pptpd[769]: CTRL: I wrote 32 bytes to the client. Oct 17 20:05:57 debian pptpd[769]: CTRL: Sent packet to client Oct 17 20:05:57 debian pptpd[771]: CTRL (PPPD Launcher): program binary = /usr/sbin/pppd Oct 17 20:05:57 debian pptpd[771]: CTRL (PPPD Launcher): local address = 192.168.1.1 Oct 17 20:05:57 debian pptpd[771]: CTRL (PPPD Launcher): remote address = 192.168.2.1 Oct 17 20:05:57 debian pptpd[769]: CTRL: Received PPTP Control Message (type: 15) Oct 17 20:05:57 debian pptpd[769]: CTRL: Got a SET LINK INFO packet with standard ACCMs Oct 17 20:05:57 debian pppd[771]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so is for pppd version 2.4.4, this is 2.4.5 Oct 17 20:05:57 debian pptpd[769]: GRE: read(fd=6,buffer=1fb40,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs Oct 17 20:05:57 debian pptpd[769]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7) Oct 17 20:05:57 debian pptpd[769]: CTRL: Reaping child PPP[771] Oct 17 20:05:57 debian pptpd[769]: CTRL: Client 192.168.0.7 control connection finished Oct 17 20:05:57 debian pptpd[769]: CTRL: Exiting now Oct 17 20:05:57 debian pptpd[507]: MGR: Reaped child 769似乎 GRE 有問題…但是，正如我已經說過的，與我的 Windows 伺服器的 PPTP 連接正在工作（如果我將路由器中的埠轉發設置回 Windows 伺服器）。Windows 伺服器是否使用 GRE 進行 PPTP VPN 連接？如果他們這樣做，我想我可以假設我的路由器支持 GRE。我可能需要在 Debian 系統上設置 GRE 支持嗎？*