cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
991
Views
0
Helpful
3
Replies

1921 NAT/Remote access config help

mwilliams
Level 1
Level 1

I have to open several ports from the WAN to LAN on a 1921:

For example:

Say I need port 41795 both UDP and TCP to go from the WAN to the LAN, can someone provide me the context I have to follow?

Currently I have this in place

Another piece of this is that the devices that will need to be accessed remotely are on VLAN10 - will that cause a problem?

Thanks for any help, I appreciate it. This is installed at a clients home for a very complex Crestron network that included 5 Cisco POE GB switches, 2 VLANS, with VLAN10 utilizing QOS and is the AV network (VLAN1 is the computer network), 8 1142 WAP's, and this 1921.

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2011.12.16 19:52:41 =~=~=~=~=~=~=~=~=~=~=~=
show run
Building configuration...

Current configuration : 3340 bytes
!
! No configuration change since last restart
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname DHOWE_Router
!
boot-start-marker
boot-end-marker
!
!
enable secret 5 $1$JuTn$zn6CnXIm1bJGgPhtRCfB0.
enable password ********
!
no aaa new-model
!
!
no ipv6 cef
ip source-route
ip cef
!
!
ip dhcp excluded-address 192.168.39.0 192.168.39.49
ip dhcp excluded-address 192.168.39.100 192.168.39.254
ip dhcp excluded-address 192.168.38.0 192.168.38.49
ip dhcp excluded-address 192.168.38.100 192.168.38.254
!
ip dhcp pool 39subnet
network 192.168.39.0 255.255.255.0
dns-server 8.8.8.8
default-router 192.168.39.1
lease 7
!
ip dhcp pool vlan10-pool
network 192.168.38.0 255.255.255.0
dns-server 8.8.8.8 4.2.2.2
default-router 192.168.38.1
lease 7
!
!
!
multilink bundle-name authenticated
!
crypto pki token default removal timeout 0
!
!
license udi pid CISCO1921/K9 sn FTX153904V6
!
!
!
redundancy
!
!
!
!
!
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
ip address X.X.X.X 255.255.248.0
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
no mop enabled
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/1.1
encapsulation dot1Q 10
ip address 192.168.38.1 255.255.255.0
no ip redirects
no ip unreachables
ip flow ingress
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/1.2
encapsulation dot1Q 1 native
ip address 192.168.39.1 255.255.255.0
no ip redirects
no ip unreachables
ip flow ingress
ip nat inside
ip virtual-reassembly in
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip nat inside source list nat-acl interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 *.*.*.* 254
!
ip access-list extended nat-acl
permit ip 192.168.38.0 0.0.0.255 any
permit ip 192.168.39.0 0.0.0.255 any
!
access-list 100 permit tcp any any eq 41795
access-list 100 permit udp any any eq 41795
access-list 100 permit tcp any any eq 41095
access-list 100 permit udp any any eq 41095
access-list 100 permit tcp any any eq 41195
access-list 100 permit udp any any eq 41195
access-list 100 permit tcp any any eq 41295
access-list 100 permit udp any any eq 41295
access-list 100 permit tcp any any eq 41395
access-list 100 permit udp any any eq 41395
access-list 100 permit tcp any any eq 41495
access-list 100 permit udp any any eq 41495
access-list 100 permit tcp any any eq 41595
access-list 100 permit udp any any eq 41595
access-list 100 permit tcp any any eq 41695
access-list 100 permit udp any any eq 41695
access-list 100 permit tcp any any eq 41895
access-list 100 permit udp any any eq 41895
access-list 100 permit tcp any any eq 41995
access-list 100 permit udp any any eq 41995
access-list 100 permit tcp any any eq 41790
access-list 100 permit udp any any eq 41790
access-list 100 permit tcp any any eq www
access-list 100 permit udp any any eq 80
!
!
!
!
!
!
control-plane
!
!
!
line con 0
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
password *********
login
transport input all
!
scheduler allocate 20000 1000
end

DHOWE_Router#

1 Accepted Solution

Accepted Solutions

johnlloyd_13
Level 9
Level 9

hi morris,

try to configure your static NAT from global config as below:

ip nat inside source static tcp 192.168.38.X 41795 41795

ip nat inside source static udp 192.168.38.X 41795 41795

with regards to remotely accessing devices in VLAN 10, i don't think these changes will cause any disruption but it will be nice and prudent if you do this during off peak hours.

View solution in original post

3 Replies 3

johnlloyd_13
Level 9
Level 9

hi morris,

try to configure your static NAT from global config as below:

ip nat inside source static tcp 192.168.38.X 41795 41795

ip nat inside source static udp 192.168.38.X 41795 41795

with regards to remotely accessing devices in VLAN 10, i don't think these changes will cause any disruption but it will be nice and prudent if you do this during off peak hours.

Hi John,

Thank you for the quick reply. I did try to create the static NAT but kept running into syntax errors. I am hoping that I will get a chance to pop these in there tomorrow and I will report back. Thank you again for your help.

hi morris,

sure just post here what error you ran into and will try to help you out. make sure you did as below:

Router(config)#ip nat inside source static tcp 192.168.38.X 41795 41795

note that i've used 192.168.38.X and as arbitrary entries and these would depend on your actual router setup.

Review Cisco Networking products for a $25 gift card