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OpenVPN - 无法连接到新子网上的客户端

tag-icon • tag-icon networking vpn openvpn subnet
OpenVPN - 无法连接到新子网上的客户端

我运行一个服务器，通过 OpenVPN 连接着很多客户端，客户端数量慢慢增长，几天前达到 255 多个。最初设置 VPN 时，我考虑到了这一点，并将子网掩码设置为“255.255.0.0”；然而，有些不对劲，因为我可以连接到具有10.8.0.xIP 地址的旧客户端，但无法连接到任何具有 IP 地址的新客户端10.8.1.x。

我的配置中是否遗漏了什么？

  • /etc/openvpn/server.conf： 
    port 1194
proto udp
dev tun

ca ca.crt
crl-verify crl.pem
cert server.crt
key server.key
dh dh.pem

auth SHA512
tls-auth ta.key 0
cipher AES-256-CBC

topology subnet
server 10.8.0.0 255.255.0.0
ifconfig-pool-persist ipp.txt

push "bypass-dhcp"
push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"
push "dhcp-option DNS 10.8.0.1"

keepalive 10 120
sndbuf 0
rcvbuf 0
persist-key
persist-tun

verb 3

log /var/log/openvpn.log
status openvpn-status.log

# This automatically assigns domain names to clients, based on their names:
  # NOTE: You have to comment out user and grop lines above for this to even work
    #user nobody
    #group nogroup

    # default is 1 which doesn't allow user-defined scripts
    script-security 2
    learn-address /home/dvida/openvpn_scripts/learn_address.sh
  • /etc/openvpn/client-common.txt： 
    client
dev tun
proto udp
remote blah.blah.com 1194

sndbuf 0
rcvbuf 0
mssfix 1160

resolv-retry infinite
persist-key
persist-tun
nobind

remote-cert-tls server
tls-version-min 1.0
key-direction 1

auth SHA512
cipher AES-256-CBC

verb 3
  • ifconfig报告此 VPN 接口没有与其他接口的 IP 冲突： 
    tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.8.0.1  P-t-P:10.8.0.1  Mask:255.255.0.0
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:71105670 errors:0 dropped:0 overruns:0 frame:0
          TX packets:70755978 errors:0 dropped:391 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:42092973453 (39.2 GiB)  TX bytes:42070922921 (39.1 GiB)

答案1

事实证明，这与 OpenVPN 无关，而是与以下 SNAT 规则有关：

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to 129.100.40.167
  • 我更新了实时iptables规则，并修复了其中的问题，/etc/rc.local因此网络掩码/16改为/24

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