Cisco ASA8.4ポートフォワーディング
インターネット上のホストから内部ネットワーク上のホストへのCiscoASAでのポート転送に問題があります。 ASAの外部インターフェイスはDHCPを介して割り当てられます。これを正しく機能させるために他にやらなければならないことがありますか？
問題の更新
(outside) to (outside) source dynamic VPN_NETWORK interface
あたり：
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
packet-tracer：
# 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
running-config
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
バージョン8.3以降、access-groupステートメントで適用されるアクセスリストは、着信パケットがNATされたIPに向けられている場合でも、常に実際のIPアドレスを使用します。 詳細については、ASAバージョン8.3移行ガイド を参照してください。
代わりに、アクセスリストは次のようになります。
access-list VM_IN extended permit tcp any Host 172.16.1.125 eq 777
または、さらに良いことに、オブジェクトを使用して、将来1か所で更新するだけで済みます。
access-list VM_IN extended permit tcp any object VM eq 777
編集（Astronからの説明を反映）：
動的に割り当てられたアドレス（DHCPなど）を持つインターフェイスで内部ホスト192.168.1.125にインバウンドポート転送を行うには：
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
重要なのは、natステートメントのstatic interface部分です。 interfaceは、変換のためにパケットが到着したときにoutsideインターフェイスのIPに置き換えられます。