I have an ASA5510 configured for IPSec VPN.
Two Windows client PCs (each on separate ISP broadband lines) can successfully connect to it and detect the VPN's DNS (on its "inside" interface) which allows RDP access to terminal servers (also on the "inside" interface).
Other Windows client PCs (using different ISP broadband/mobile lines) can connect to the same VPN but do not detect its DNS - they instead detect their own ISP's DNS.
This means they cannot RDP to these terminal servers.
Below is a running config of my ASA.
< start of config >
HF003088-CLCH-PG-IPSec-FW1# sh ru
: Saved
:
ASA Version 8.2(5)
!
hostname HF003088-CLCH-PG-IPSec-FW1
domain-name riverside.nhs.uk
enable password iVamNSP6IPQcCHIY encrypted
passwd qXY8JKej0SAhi0GD encrypted
no names
dns-guard
!
interface Ethernet0/0
nameif Easynet-Outside
security-level 0
ip address 217.207.189.197 255.255.255.240
!
interface Ethernet0/1
nameif CLCH-Inside
security-level 100
ip address 192.168.50.6 255.255.255.0
!
interface Ethernet0/2
shutdown
no nameif
no security-level
no ip address
!
interface Ethernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
shutdown
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
management-only
!
ftp mode passive
dns domain-lookup Easynet-Outside
dns domain-lookup CLCH-Inside
dns server-group DefaultDNS
name-server 192.168.55.114
name-server 192.168.25.59
domain-name riverside.nhs.uk
same-security-traffic permit intra-interface
object-group protocol DM_INLINE_PROTOCOL_1
protocol-object ip
protocol-object icmp
access-list NONAT-001 extended permit ip 192.168.25.0 255.255.255.0 10.252.1.0 2
55.255.255.0
access-list NONAT-001 extended permit ip 192.168.49.0 255.255.255.0 10.252.1.0 2
55.255.255.0
access-list NONAT-001 extended permit ip 192.168.55.0 255.255.255.0 10.252.1.0 2
55.255.255.0
access-list NONAT-001 extended permit ip 192.168.50.0 255.255.255.0 10.252.1.0 2
55.255.255.0
access-list NONAT-001 extended permit ip 192.168.4.0 255.255.255.0 10.252.1.0 25
5.255.255.0
access-list clchsplittunnel-001 standard permit 192.168.50.0 255.255.255.0
access-list clchsplittunnel-001 standard permit 192.168.25.0 255.255.255.0
access-list clchsplittunnel-001 standard permit 192.168.55.0 255.255.255.0
access-list clchsplittunnel-001 standard permit 192.168.49.0 255.255.255.0
access-list clchsplittunnel-001 standard permit 192.168.4.0 255.255.255.0
pager lines 24
logging enable
logging asdm informational
mtu Easynet-Outside 1500
mtu CLCH-Inside 1500
mtu management 1500
ip local pool clchip 10.252.1.10-10.252.1.250 mask 255.255.255.0
no failover
icmp unreachable rate-limit 1 burst-size 1
icmp permit 192.168.50.0 255.255.255.0 echo CLCH-Inside
icmp permit 192.168.50.0 255.255.255.0 echo-reply CLCH-Inside
icmp permit 192.168.25.0 255.255.255.0 echo-reply CLCH-Inside
icmp permit 192.168.25.0 255.255.255.0 echo CLCH-Inside
icmp permit 192.168.55.0 255.255.255.0 echo CLCH-Inside
icmp permit 192.168.55.0 255.255.255.0 echo-reply CLCH-Inside
asdm image disk0:/asdm-645.bin
no asdm history enable
arp timeout 14400
global (Easynet-Outside) 1 interface
nat (CLCH-Inside) 0 access-list NONAT-001
nat (CLCH-Inside) 1 0.0.0.0 0.0.0.0
route Easynet-Outside 0.0.0.0 0.0.0.0 217.207.189.193 1
route CLCH-Inside 192.168.0.0 255.255.0.0 192.168.50.1 1
route CLCH-Inside 192.168.25.0 255.255.255.0 192.168.50.1 1
route CLCH-Inside 192.168.49.0 255.255.255.0 192.168.50.1 1
route CLCH-Inside 192.168.55.0 255.255.255.0 192.168.50.1 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
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
aaa-server clchntserver protocol nt
reactivation-mode timed
aaa-server clchntserver (CLCH-Inside) host 192.168.55.114
nt-auth-domain-controller 192.168.55.114
aaa-server clchntserver (CLCH-Inside) host 192.168.25.59
nt-auth-domain-controller 192.168.25.59
http server enable
http 192.168.50.0 255.255.255.0 CLCH-Inside
http 192.168.55.0 255.255.255.0 CLCH-Inside
http 192.168.25.0 255.255.255.0 CLCH-Inside
http 192.168.1.0 255.255.255.0 management
snmp-server host CLCH-Inside 192.168.49.17 community *****
no snmp-server location
no snmp-server contact
snmp-server community *****
snmp-server enable traps snmp authentication linkup linkdown coldstart
snmp-server enable traps syslog
snmp-server enable traps ipsec start stop
snmp-server enable traps entity config-change fru-insert fru-remove
snmp-server enable traps remote-access session-threshold-exceeded
crypto ipsec transform-set clchset esp-3des esp-md5-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto dynamic-map clchdymap 1 set transform-set clchset
crypto dynamic-map clchdymap 1 set reverse-route
crypto map clchmap 1 ipsec-isakmp dynamic clchdymap
crypto map clchmap interface Easynet-Outside
crypto isakmp identity hostname
crypto isakmp enable Easynet-Outside
crypto isakmp policy 1
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 43200
no crypto isakmp nat-traversal
telnet 192.168.50.0 255.255.255.0 CLCH-Inside
telnet 192.168.25.0 255.255.255.0 CLCH-Inside
telnet 192.168.55.0 255.255.255.0 CLCH-Inside
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
group-policy clchpolicy internal
group-policy clchpolicy attributes
dns-server value 192.168.55.114 192.168.25.59
vpn-tunnel-protocol IPSec
split-tunnel-policy tunnelspecified
split-tunnel-network-list value clchsplittunnel-001
default-domain value riverside.nhs.uk
tunnel-group clchgroup type remote-access
tunnel-group clchgroup general-attributes
address-pool clchip
authentication-server-group clchntserver
default-group-policy clchpolicy
tunnel-group clchgroup ipsec-attributes
pre-shared-key *****
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns migrated_dns_map_1
parameters
message-length maximum client auto
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns migrated_dns_map_1
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
< end of config >
Any help to resolve this I would appreciate.
Muhammed Islam
