- Teacher Alright, allow's move ahead and talk…about the most popular type of NAT, and that is certainly…Port Deal with Interpretation, or NAT overloading.…The cause we would make use of this is usually, we usually possess…one address we get from our lSP and we need to possess…multiple customers get out using the same tackle.…Let's proceed ahead and take a appearance at the construction,…in that case we'll operate out there and do it.…First, remember, often check out your interfaces.…Right now I understand I've happen to be putting these in purchase…as one, twó, three, four.…Thát's the Ciscó objectives, how they do it, that's…not really really necessary as long as you simply get them aIl.…
Só our quantity one, then check this óut,…ip nat insidé source listing 1.…Therefore so significantly, it appears like we're doing powerful NAT.…Genuine, same command word.…ip nat inside resource, checklist 1 can make use of user interface,…my outside user interface, which can be my outdoors local,…thus we're stating use that IP deal with…on gigabit zero one, here it is definitely, right right here,…everyone'h gonna use that and overload it.…Right now if I put on't place the keyword overIoad,…I can push Enter and I'meters just carrying out powerful NAT.…
Hi all!
I'm having this strange concern with Cisco IOS where a stationary NAT admittance to an internal web machine (slot forwarding from the Internet) helps prevent entry to the same web server over a site-to-site VPN canal. The canal links the Chi town LAN (192.168.67.0 /24) to the UK LAN (192.168.1.0 /24). The internet server is definitely 192.168.1.105 tcp/80.
When I eliminate the stationary NAT entrance, Chicago can all of a sudden gain access to the webserver once again across the VPN. When I add the stationary NAT, Internet users can gain access to it, but Chi town cannot. I need to allow simultaneous entry for Chi town and Internet customers. I've established this up effectively before on a Watchguard firewall, therefore I must become carrying out something incorrect in the config?
The British config is demonstrated below. It'h a Cisco 1811 runing IOS 12.4.8 performing as a router/firewall/VPN peer. The Chicago end offers a Nortel Contivity firewall/vpn, which I didn't set up and don'capital t have gain access to to.
The VPN tunnel works fine. Both LANs can connect freely since all traffic is allowed. The webserver vpn access issue only arrises when I add the highlighted static nat command. Chicago can gain access to other ports on the webserver (SMB/RDP) with the nat access included. This shows to me that there isn't a simple routing concern accross the tunnel. I believe that the outgoing Active NAT accessibility control (gain access to checklist NATACL) is correct in that it prevents the return VPN visitors (back again to Chi town) from becoming NATed?
The British WAN/canal peer is usually x.a.x.a
The Chicago WAN/canal peer will be y.y.y.y
-
version 12.4
!
hostname 1811
!
aaa authentication login default local
!
ip cef
!
ip inspect name FIREWALL1 udp
ip inspect name FIREWALL1 tcp
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
group 2
no-xauth
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
!
crypto map CompanyMAP 1 ipsec-isakmp
description Canal TOCHICAGO
set peer con.y.y.con
arranged security-association lifetime kilobytes 536870912
fixed security-association lifetime mere seconds 120
fixed transform-set ESP-3DES-MD5
match deal with CHICAGOVPNTRAFFIC
!
interface FastEthernet0
explanation.OUTSIDE INTERFACE.
ip deal with x.times.x.times 255.255.255.240.wright here x.back button.x.a is usually my WAN tackle.
ip access-group OUT2IN in
ip nat outside
ip examine FIREWALL1 out
ip virtual-reassembly
duplex auto
speed car
crypto chart CompanyMAP
crypto ipsec df-bit clear
!
user interface FastEthernet1
no ip address.INSIDE INTERFACE.
duplex auto
quickness auto
!
interface Vlan1
description.INSIDE VLAN.
ip address 192.168.1.254 255.255.255.0
ip access-group IN2OUT in
ip nat inside
ip virtual-reassembly
!
ip default-gateway lt;WANgatewaygt;
ip path 0.0.0.0 0.0.0.0 lt;WANgatewaygt;
!
ip nat inside source listing NATACL interface FastEthernet0 overload
ip nat inside source static tcp 192.168.1.105 www x.back button.x.back button www extendable
!
ip access-list expanded CHICAGOVPNTRAFFIC
support ip 192.168.1.0 0.0.0.255 192.168.67.0 0.0.0.255 log
ip access-list extended IN2OUT
support ip any any sign
ip access-list expanded NATACL
deny ip 192.168.1.0 0.0.0.255 192.168.67.0 0.0.0.255 record.prevents VPN taffic from getting NATed.
grant ip 192.168.1.0 0.0.0.255 any log
ip access-list prolonged OUT2IN
give ip 192.168.67.0 0.0.0.255 192.168.1.0 0.0.0.255 sign
give tcp any host x.times.x.times eq www sign
permit esp any any journal
support udp any any eq isakmp record
deny ip any any
!
finish
-
I've been striving with this for times so any assist is significantly appreciated.
Thanks
Chronik
I'm having this strange concern with Cisco IOS where a stationary NAT admittance to an internal web machine (slot forwarding from the Internet) helps prevent entry to the same web server over a site-to-site VPN canal. The canal links the Chi town LAN (192.168.67.0 /24) to the UK LAN (192.168.1.0 /24). The internet server is definitely 192.168.1.105 tcp/80.
When I eliminate the stationary NAT entrance, Chicago can all of a sudden gain access to the webserver once again across the VPN. When I add the stationary NAT, Internet users can gain access to it, but Chi town cannot. I need to allow simultaneous entry for Chi town and Internet customers. I've established this up effectively before on a Watchguard firewall, therefore I must become carrying out something incorrect in the config?
The British config is demonstrated below. It'h a Cisco 1811 runing IOS 12.4.8 performing as a router/firewall/VPN peer. The Chicago end offers a Nortel Contivity firewall/vpn, which I didn't set up and don'capital t have gain access to to.
The VPN tunnel works fine. Both LANs can connect freely since all traffic is allowed. The webserver vpn access issue only arrises when I add the highlighted static nat command. Chicago can gain access to other ports on the webserver (SMB/RDP) with the nat access included. This shows to me that there isn't a simple routing concern accross the tunnel. I believe that the outgoing Active NAT accessibility control (gain access to checklist NATACL) is correct in that it prevents the return VPN visitors (back again to Chi town) from becoming NATed?
The British WAN/canal peer is usually x.a.x.a
The Chicago WAN/canal peer will be y.y.y.y
-
version 12.4
!
hostname 1811
!
aaa authentication login default local
!
ip cef
!
ip inspect name FIREWALL1 udp
ip inspect name FIREWALL1 tcp
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
group 2
no-xauth
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
!
crypto map CompanyMAP 1 ipsec-isakmp
description Canal TOCHICAGO
set peer con.y.y.con
arranged security-association lifetime kilobytes 536870912
fixed security-association lifetime mere seconds 120
fixed transform-set ESP-3DES-MD5
match deal with CHICAGOVPNTRAFFIC
!
interface FastEthernet0
explanation.OUTSIDE INTERFACE.
ip deal with x.times.x.times 255.255.255.240.wright here x.back button.x.a is usually my WAN tackle.
ip access-group OUT2IN in
ip nat outside
ip examine FIREWALL1 out
ip virtual-reassembly
duplex auto
speed car
crypto chart CompanyMAP
crypto ipsec df-bit clear
!
user interface FastEthernet1
no ip address.INSIDE INTERFACE.
duplex auto
quickness auto
!
interface Vlan1
description.INSIDE VLAN.
ip address 192.168.1.254 255.255.255.0
ip access-group IN2OUT in
ip nat inside
ip virtual-reassembly
!
ip default-gateway lt;WANgatewaygt;
ip path 0.0.0.0 0.0.0.0 lt;WANgatewaygt;
!
ip nat inside source listing NATACL interface FastEthernet0 overload
ip nat inside source static tcp 192.168.1.105 www x.back button.x.back button www extendable
!
ip access-list expanded CHICAGOVPNTRAFFIC
support ip 192.168.1.0 0.0.0.255 192.168.67.0 0.0.0.255 log
ip access-list extended IN2OUT
support ip any any sign
ip access-list expanded NATACL
deny ip 192.168.1.0 0.0.0.255 192.168.67.0 0.0.0.255 record.prevents VPN taffic from getting NATed.
grant ip 192.168.1.0 0.0.0.255 any log
ip access-list prolonged OUT2IN
give ip 192.168.67.0 0.0.0.255 192.168.1.0 0.0.0.255 sign
give tcp any host x.times.x.times eq www sign
permit esp any any journal
support udp any any eq isakmp record
deny ip any any
!
finish
-
I've been striving with this for times so any assist is significantly appreciated.
Thanks
Chronik
Conserve global IP address by learning to Configure Dynamic Port Address Translations (PAT) in Cisco IOS Router. Dynamic PAT allows translations of multiple local address using the same global address. It can also be configured together with static NAT that allows incoming access on the global address.