Cisco
Cisco ASA 8.4 埠轉發
我在 Cisco ASA 上從 Internet 上的主機到內部網路上的主機的埠轉發時遇到問題。ASA 的外部介面是通過 DHCP 分配的。為了使這項工作正常工作，還有其他事情要做嗎？
更新到問題
(outside) to (outside) source dynamic VPN_NETWORK interface每：
https://www.cisco.com/en/US/docs/security/asa/asa84/configuration/guide/nat_rules.html
(outside) to (outside) after-auto source dynamic VPN_NETWORK interface數據包跟踪器：
# packet-tracer input outside tcp 74.x.x.x 1025 71.x.x.x 555 Phase: 1 Type: ROUTE-LOOKUP Subtype: input Result: ALLOW Config: Additional Information: in 71.x.x.x 255.255.255.255 identity Phase: 2 Type: ACCESS-LIST Subtype: Result: DROP Config: Implicit Rule Additional Information: Result: input-interface: outside input-status: up input-line-status: up output-interface: NP Identity Ifc output-status: up output-line-status: up Action: drop Drop-reason: (acl-drop) Flow is denied by configured rule執行配置
ASA Version 8.4(2) ! hostname asa enable password ***** encrypted passwd ***** encrypted names ! interface Ethernet0/0 switchport access vlan 2 ! interface Ethernet0/1 ! interface Ethernet0/2 ! interface Ethernet0/3 ! interface Ethernet0/4 ! interface Ethernet0/5 ! interface Ethernet0/6 ! interface Ethernet0/7 ! interface Vlan1 nameif inside security-level 100 ip address 172.16.1.1 255.255.255.0 ! interface Vlan2 nameif outside security-level 0 ip address dhcp setroute ! boot system disk0:/asa842-k8.bin ftp mode passive same-security-traffic permit intra-interface object network obj_any subnet 0.0.0.0 0.0.0.0 object network VPN_NETWORK subnet 192.168.1.0 255.255.255.192 object network VM host 172.16.1.100 access-list dynamic-filter_acl extended permit ip any any access-list VM-IN extended permit tcp any host 172.16.1.100 eq 555 pager lines 24 logging enable logging asdm informational mtu inside 1500 mtu outside 1500 ip local pool VPN-DHCP-POOL 192.168.1.10-192.168.1.50 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-645-206.bin no asdm history enable arp timeout 14400 nat (inside,outside) source static any any destination static VPN_NETWORK VPN_NETWORK no-proxy-arp route-lookup nat (outside,outside) source dynamic VPN_NETWORK interface ! object network obj_any nat (inside,outside) dynamic interface object network VM nat (inside,outside) static interface service tcp 555 555 access-group VM-IN in interface outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute timeout tcp-proxy-reassembly 0:01:00 timeout floating-conn 0:00:00 dynamic-access-policy-record DfltAccessPolicy user-identity default-domain LOCAL aaa authentication http console LOCAL aaa authentication ssh console LOCAL http server enable http 172.16.1.0 255.255.255.0 inside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec ikev1 transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac crypto ipsec ikev1 transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac crypto ipsec ikev1 transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs group1 crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev1 transform-set ESP-AES-256-SHA crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP crypto map outside_map interface outside crypto map inside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP crypto map inside_map interface inside crypto ikev1 enable inside crypto ikev1 enable outside crypto ikev1 policy 10 authentication crack encryption aes-256 hash sha group 2 lifetime 86400 crypto ikev1 policy 20 authentication rsa-sig encryption aes-256 hash sha group 2 lifetime 86400 crypto ikev1 policy 30 authentication pre-share encryption aes-256 hash sha group 2 lifetime 86400 telnet timeout 5 ssh 172.16.1.0 255.255.255.0 inside ssh timeout 5 ssh version 2 console timeout 0 dhcp-client client-id interface outside dhcpd auto_config outside ! dhcpd address 172.16.1.100-172.16.1.200 inside dhcpd dns 8.8.8.8 8.8.4.4 interface inside dhcpd option 3 ip 172.16.1.1 interface inside dhcpd enable inside ! threat-detection basic-threat threat-detection statistics access-list no threat-detection statistics tcp-intercept dynamic-filter enable interface outside classify-list dynamic-filter_acl dynamic-filter drop blacklist interface outside ssl encryption des-sha1 webvpn group-policy EdgeAccess internal group-policy EdgeAccess attributes dns-server value 8.8.8.8 8.8.4.4 vpn-tunnel-protocol ikev1 username user password ***** encrypted tunnel-group EdgeAccess type remote-access tunnel-group EdgeAccess general-attributes address-pool VPN-DHCP-POOL default-group-policy EdgeAccess tunnel-group EdgeAccess ipsec-attributes ikev1 pre-shared-key ***** ! class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect esmtp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp inspect ip-options ! service-policy global_policy global privilege show level 0 mode configure command filter privilege cmd level 0 mode configure command filter privilege cmd level 0 mode config-group-webvpn command filter privilege cmd level 0 mode config-username-webvpn command filter prompt hostname context no call-home reporting anonymous : end
從 8.3 版開始，使用
access-group語句應用的訪問列表始終使用真實 IP 地址，即使傳入的數據包指向經過 NAT 處理的 IP；有關詳細資訊，請參閱ASA 版本 8.3 遷移指南。您的訪問列表應如下所示：
access-list VM_IN extended permit tcp any host 172.16.1.125 eq 777或者，更好的是，使用該對象，這樣您以後只需在一個地方更新它：
access-list VM_IN extended permit tcp any object VM eq 777編輯（反映 Astron 的澄清）：
要在具有動態分配地址（例如 DHCP）的介面上將入站埠轉發到內部主機 192.168.1.125：
object network VM host 192.168.1.125 ! object network VM nat (inside,outside) static interface service tcp 777 777 ! access-list VM_IN extended permit tcp any object VM eq 777 ! access-group VM_IN in interface outside關鍵是語句中的
static interface部分。nat它將替換為數據包到達進行轉換時interface的介面 IP 。outside