我最近安装了 ASA 5505，通过站点到站点 VPN 连接多个站点，运行良好。我还需要为用户提供远程访问 VPN，该 VPN 也已使用 L2TP/IPSec 进行配置。但是，我在配置方面遇到了问题，无法允许远程访问用户访问任何站点 VPN 连接的网络上的系统。以下是中心/辐射配置中的一般布局：
10.100.20.0/24 - 中央办公室（枢纽） 10.100.50.0/24 - 远程办公室 1 10.100.60.0/24 - 远程办公室 2 10.100.70.0/24 - 远程办公室 3
10.200.0.0/24-远程访问池
中心办公室可以与任何远程办公室通信，所有远程办公室都可以与中心办公室通信。远程访问用户只能与作为其 VPN（L2TP）端点的中心办公室通信。
我很好奇，我需要考虑什么 NAT 和/或路由配置才能允许远程访问用户访问任何连接的远程办公室？
提前致谢！克里斯
这里是配置（有必要的混淆）：
ASA Version 8.2(1)
!
hostname ciscoasa
enable password ***** encrypted
passwd ***** encrypted
names
name 208.67.222.222 opendns1
name 208.67.220.220 opendns2
!
interface Vlan1
nameif inside
security-level 100
ip address 10.100.20.254 255.255.255.0
!
interface Vlan2
nameif outside
security-level 0
ip address 200.200.200.2 255.255.255.252
!
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
!
ftp mode passive
clock timezone EST -5
clock summer-time EDT recurring
dns domain-lookup inside
dns domain-lookup outside
dns server-group DefaultDNS
name-server opendns2
name-server opendns1
same-security-traffic permit intra-interface
object-group protocol TCPUDP
protocol-object udp
protocol-object tcp
object-group network opendns-servers
network-object host opendns2
network-object host opendns1
access-list outside_1_cryptomap extended permit ip 10.100.20.0 255.255.255.0 10.100.50.0 255.255.255.0
access-list outside_2_cryptomap extended permit ip 10.100.20.0 255.255.255.0 10.100.60.0 255.255.255.0
access-list outside_3_cryptomap extended permit ip 10.100.20.0 255.255.255.0 10.100.70.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.100.20.0 255.255.255.0 10.100.50.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.100.20.0 255.255.255.0 10.100.60.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.100.20.0 255.255.255.0 10.100.70.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.100.20.0 255.255.255.0 10.200.0.0 255.255.255.0
access-list inside_access_in extended permit object-group TCPUDP any object-group opendns-servers eq domain
access-list inside_access_in extended permit object-group TCPUDP host 10.100.20.1 any eq domain
access-list inside_access_in extended deny object-group TCPUDP any any eq domain
access-list inside_access_in extended permit ip any any
access-list outside_access_in extended deny ip any any
access-list outside_nat0_outbound extended permit ip 10.200.0.0 255.255.255.0 10.100.20.0 255.255.255.0
access-list DefaultRAGroup_splitTunnelAcl standard permit 10.100.20.0 255.255.255.0
pager lines 24
logging enable
logging asdm-buffer-size 300
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool RA-pool 10.200.0.1-10.200.0.50 mask 255.255.255.0
ip local pool test-pool 10.100.20.200-10.100.20.209 mask 255.255.255.0
icmp unreachable rate-limit 1 burst-size 1
icmp permit any inside
icmp deny any echo outside
no asdm history enable
arp timeout 14400
nat-control
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 0.0.0.0 0.0.0.0 dns
nat (outside) 0 access-list outside_nat0_outbound outside
access-group inside_access_in in interface inside
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 200.200.200.1 1
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
dynamic-access-policy-record DfltAccessPolicy
aaa authentication ssh console LOCAL
http server enable
http 10.100.20.0 255.255.255.0 inside
http 0.0.0.0 0.0.0.0 outside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec transform-set TRANS_ESP_3DES_SHA esp-3des esp-sha-hmac
crypto ipsec transform-set TRANS_ESP_3DES_SHA mode transport
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set transform-set TRANS_ESP_3DES_SHA ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map outside_map 1 match address outside_1_cryptomap
crypto map outside_map 1 set pfs
crypto map outside_map 1 set peer 1.1.1.1
crypto map outside_map 1 set transform-set ESP-3DES-SHA
crypto map outside_map 2 match address outside_2_cryptomap
crypto map outside_map 2 set pfs
crypto map outside_map 2 set peer 2.2.2.2
crypto map outside_map 2 set transform-set ESP-3DES-SHA
crypto map outside_map 3 match address outside_3_cryptomap
crypto map outside_map 3 set pfs
crypto map outside_map 3 set peer 3.3.3.3
crypto map outside_map 3 set transform-set ESP-3DES-SHA
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 5
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto isakmp policy 10
authentication pre-share
encryption des
hash sha
group 2
lifetime 86400
crypto isakmp policy 30
authentication crack
encryption 3des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh 0.0.0.0 0.0.0.0 inside
ssh 0.0.0.0 0.0.0.0 outside
ssh timeout 15
ssh version 2
console timeout 0
dhcpd auto_config outside
!
threat-detection basic-threat
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
enable inside
enable outside
svc image disk0:/anyconnect-win-2.4.1012-k9.pkg 1
group-policy DefaultRAGroup internal
group-policy DefaultRAGroup attributes
dns-server value 208.67.222.222 208.67.220.220
vpn-tunnel-protocol IPSec l2tp-ipsec
ip-comp disable
pfs disable
split-tunnel-policy tunnelspecified
split-tunnel-network-list value DefaultRAGroup_splitTunnelAcl
group-policy DfltGrpPolicy attributes
vpn-tunnel-protocol IPSec l2tp-ipsec svc webvpn
split-tunnel-policy tunnelspecified
split-tunnel-network-list value DefaultRAGroup_splitTunnelAcl
webvpn
svc ask enable
username user1 password ***** nt-encrypted privilege 15
username user1 attributes
vpn-group-policy DefaultRAGroup
username user2 password ***** nt-encrypted
username user2 attributes
vpn-group-policy DefaultRAGroup
service-type remote-access
username user3 password ***** encrypted
username user3 attributes
vpn-group-policy DefaultRAGroup
service-type remote-access
tunnel-group DefaultRAGroup general-attributes
address-pool RA-pool
default-group-policy DefaultRAGroup
strip-realm
strip-group
tunnel-group DefaultRAGroup ipsec-attributes
pre-shared-key *
isakmp keepalive disable
tunnel-group DefaultRAGroup ppp-attributes
authentication ms-chap-v2
tunnel-group DefaultWEBVPNGroup general-attributes
address-pool RA-pool
dhcp-server 10.100.20.254
tunnel-group 1.1.1.1 type ipsec-l2l
tunnel-group 1.1.1.1 ipsec-attributes
pre-shared-key *
tunnel-group 2.2.2.2 type ipsec-l2l
tunnel-group 2.2.2.2 ipsec-attributes
pre-shared-key *
tunnel-group 3.3.3.3 type ipsec-l2l
tunnel-group 3.3.3.3 ipsec-attributes
pre-shared-key *
!
!
prompt hostname context
Cryptochecksum:e78f2c61bd1c3b5dea31af3782a04b51
: end
答案1
这：
access-list DefaultRAGroup_splitTunnelAcl standard permit 10.100.20.0 255.255.255.0
结合这个：
split-tunnel-network-list value DefaultRAGroup_splitTunnelAcl
仅允许 10.100.20.0 上的流量进入 splitTunnel。因此 VPN 客户端会尝试连接到您的其他私有 IP 之一，但实际上会被路由到隧道之外的 Internet。这不是您想要的结果。
使用以下命令将其他私有 IP 添加到隧道：
access-list DefaultRAGroup_splitTunnelAcl standard permit X.X.X.X Y.Y.Y.Y
适用于您的所有其他私有 IP。
答案2
相同安全流量允许接口内
在中心站点发夹，然后通过同一接口返回到辐射站点