目前，我們正在嘗試在 Cisco ASA 版本 8.0(4) 和 CentOS Linux 伺服器之間設定 IPsec VPN。
隧道成功建立，但由於某種我們無法弄清楚的原因，防火牆正在丟棄來自 VPN 的封包。
ASA sre 中的 IPsec 設定如下：
crypto ipsec transform-set up-transform-set esp-3des esp-md5-hmac
crypto ipsec transform-set up-transform-set2 esp-3des esp-sha-hmac
crypto ipsec transform-set up-transform-set3 esp-aes esp-md5-hmac
crypto ipsec transform-set up-transform-set4 esp-aes esp-sha-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto map linuxserver 10 match address filtro-encrypt-linuxserver
crypto map linuxserver 10 set peer linuxserver
crypto map linuxserver 10 set transform-set up-transform-set2 up-transform-set3 up-transform-set4
crypto map linuxserver 10 set security-association lifetime seconds 28800
crypto map linuxserver 10 set security-association lifetime kilobytes 4608000
crypto map linuxserver interface outside
crypto isakmp enable outside
crypto isakmp policy 1
authentication pre-share
encryption aes
hash sha
group 2
lifetime 28800
crypto isakmp policy 2
authentication pre-share
encryption aes-256
hash sha
group 2
lifetime 86400
crypto isakmp policy 3
authentication pre-share
encryption aes-256
hash md5
group 2
lifetime 86400
crypto isakmp policy 4
authentication pre-share
encryption aes-192
hash sha
group 2
lifetime 86400
crypto isakmp policy 5
authentication pre-share
encryption aes-192
hash md5
group 2
group-policy linuxserverip internal
group-policy linuxserverip attributes
vpn-filter value filtro-linuxserverip
tunnel-group linuxserverip type ipsec-l2l
tunnel-group linuxserverip general-attributes
default-group-policy linuxserverip
tunnel-group linuxserverip ipsec-attributes
pre-shared-key *
有誰知道問題出在哪裡以及如何解決？
答案1
您能否在 ASA 上顯示 NAT 和相關存取清單？
例如：
存取清單 nat0 擴充功能允許 ip 192.168.105.0 255.255.255.0 192.168.1.0 255.255.255.0 nat (內部) 0 存取清單 nat0
這是我的 ASA 配置的例外情況，向您顯示 2 個 VPN 以及 No-Nat 存取清單和實際 VPN 存取清單之間的差異。基本上，您的 no-nat 存取清單是您的 VPN 存取清單的摘要：
!
interface Ethernet0/1
nameif inside
security-level 100
ip address 192.168.4.1 255.255.255.0
!
access-list nat0 extended permit ip 192.168.4.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list nat0 extended permit ip 192.168.4.0 255.255.255.0 192.168.100.0 255.255.255.0
access-list nat0 extended permit ip 192.168.4.0 255.255.255.0 10.10.0.0 255.255.0.0
access-list nat0 extended permit ip 192.168.4.0 255.255.255.0 192.168.7.0 255.255.255.0
access-list TONJ extended permit ip 192.168.4.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list TONJ extended permit ip 192.168.4.0 255.255.255.0 192.168.100.0 255.255.255.0
access-list TONJ extended permit ip 192.168.4.0 255.255.255.0 10.10.0.0 255.255.0.0
access-list TOCHICAGO extended permit ip 192.168.4.0 255.255.255.0 192.168.7.0 255.255.255.0
!
global (outside) 1 interface
nat (inside) 0 access-list nat0
nat (inside) 1 192.168.4.0 255.255.255.0
!
crypto map 2GRMLA 28 match address TONJ
crypto map 2GRMLA 28 set peer xxx.xxx.xxx.xxx
crypto map 2GRMLA 28 set transform-set moishes
crypto map 2GRMLA 71 match address TOCHICAGO
crypto map 2GRMLA 71 set peer ***.***.***.***
crypto map 2GRMLA 71 set transform-set 3DES