連接 PPTP VPN 後無法 ping 伺服器本身

連接 PPTP VPN 後無法 ping 伺服器本身

我在 CentOS 6.5 機器上設定了 PPTP 伺服器,以使用來自公共網路的 VPN 和其他雜項腳本。一切似乎都工作正常,除了一旦連接後我無法通過其公共 IP 或名稱 ping VPN 伺服器!

假設我有以下設置

伺服器

host: vpn.myserver.com,
public ip: 178.62.x.x
private ip (pptp): 10.0.0.1
host range /dhcp: 10.0.0.100-200

客戶

private ip:= 10.241.0.76

在連接到 VPN 之前,我可以很好地 ping 伺服器(透過名稱或公用 IP)。然而,一旦連接,我必須使用伺服器的私人位址來 ssh 到伺服器。

Iptable 規則(轉儲到檔案)

# Generated by iptables-save v1.4.7 on Tue Sep 29 10:51:16 2015
*nat
:PREROUTING ACCEPT [3279:270754]
:POSTROUTING ACCEPT [16:1761]
:OUTPUT ACCEPT [354:21503]
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT
# Completed on Tue Sep 29 10:51:16 2015
# Generated by iptables-save v1.4.7 on Tue Sep 29 10:51:16 2015
*filter
:INPUT ACCEPT [76829:9558834]
:FORWARD ACCEPT [67632:61015363]
:OUTPUT ACCEPT [90822:67426561]
COMMIT
# Completed on Tue Sep 29 10:51:16 2015

系統配置:

# Controls IP packet forwarding
net.ipv4.ip_forward = 1

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

網路統計

netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.0.0.100      0.0.0.0         255.255.255.255 UH        0 0          0 ppp0
10.0.0.101      0.0.0.0         255.255.255.255 UH        0 0          0 ppp1
178.62.xx.xx    0.0.0.0         255.255.192.0   U         0 0          0 eth0
10.131.0.0      0.0.0.0         255.255.0.0     U         0 0          0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1
0.0.0.0         178.62.xx.xx    0.0.0.0         UG        0 0          0 eth0

是否缺少某些路由規則?

更新

忘記新增追蹤路由詳細資訊..

traceroute to 178.62.x.x (178.62.x.x), 64 hops max, 52 byte packets
 1  10.241.254.254 (10.241.254.254)  15.450 ms  15.955 ms  10.267 ms
 2  * * *
 3  * * *
 4  * * *
 5  * * *
 6  * * *
 7  * * *
 8  * * *
 9  * * *
10  * * *
11  * * *
12  * * *
13  * * *

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