11-23-2012 12:00 AM - edited 03-04-2019 06:13 PM
I have router 881. I prepare simply configuration with two vlan and one of them is DMZ with www server. Everything look all right with one exception. NAT not work at all. I have no entry when i type command sh ip nat translation. I try configure NAT in several ways (pools, static, one host, whole network, only one network, separate acl for networks itd.) there is no change. NAT still not work and sh ip nat trans show nothing. My config look's that:
interface FastEthernet0
description Lan
switchport access vlan 2
no ip address
!
interface FastEthernet1
description lan
switchport access vlan 2
no ip address
!
interface FastEthernet2
description lan
switchport access vlan 2
no ip address
!
interface FastEthernet3
description dmz
switchport access vlan 6
no ip address
!
interface FastEthernet4
description WAN$FW_OUTSIDE$
ip address X.X.X.X X.X.X.X
ip access-group 105 in
ip nat outside
ip virtual-reassembly in
ip verify unicast reverse-path
duplex auto
speed auto
interface Vlan2
description LAN$FW_INSIDE$
ip address 192.168.1.1 255.255.255.0
ip access-group 103 in
ip nat inside
ip inspect CCP_LOW in
ip virtual-reassembly in
!
interface Vlan6
description DMZ$FW_DMZ$
ip address 192.168.2.1 255.255.255.0
ip access-group 104 in
ip nat inside
ip inspect dmzinspect out
ip virtual-reassembly in
ip nat inside source list 2 interface FastEthernet4 overload
ip nat inside source static tcp 192.168.2.17 80 interface FastEthernet4 80
ip route 0.0.0.0 0.0.0.0 FastEthernet4
access-list 2 permit 192.168.1.0 0.0.0.255
Can anyone help me resolv this problem ?
ROM: System Bootstrap, Version 12.4(22r)YB5, RELEASE SOFTWARE (fc1)
Cisco 881-K9
Solved! Go to Solution.
11-26-2012 01:19 AM
Hi,
Could you try changing your default route to point to next hop instead of outgoing interface.
Regards.
Alain
Don't forget to rate helpful posts.
11-23-2012 08:27 AM
Wrong forum, post in "infrastructure - WAN and routing". You can move your post using the actions panel on the right.
11-23-2012 09:57 AM
How are defined ACL 103, 104, 105? Can stop traffic before it reaches NAT engine?
Try to remove ACL and inspect.
Regards.
11-25-2012 02:10 AM
I already try that. I remove all ACL and inspect, left only basic configuration on interfaces and NAT configuration - same result NAT still not work. I try to find some solutions on Internet, and I find that some of users 881 have similar NAT problems. I don't know, maybe IOS bug ?
11-26-2012 12:53 AM
have you advertised the default route into your local network? make sure that your local machines on your LAN are causing the router to hit the NAT
11-26-2012 01:22 AM
I configured DHCP for vlan 2 serwer on this router:
ip dhcp pool LAN
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server X.X.X.X
In Vlan 6 i have only one host so I'm used static address
11-26-2012 02:13 AM
Hi,
Have you tried changing the default route as I suggested ? What do you mean with everything looks alright?
Can you ping 8.8.8.8 from the router ?
Regards.
Alain
Don't forget to rate helpful posts.
11-26-2012 01:19 AM
Hi,
Could you try changing your default route to point to next hop instead of outgoing interface.
Regards.
Alain
Don't forget to rate helpful posts.
11-26-2012 02:45 AM
I don't have access to the router right now, I try change default route asp and I give you update. I have this router in other localization so I can't change config before wednesday.
"everything looks alright" - means that all other things work perfectly - DHCP, ping to interfaces and other hosts, all network functionality eg. network shares, printing, RDP,...).
11-30-2012 01:06 AM
I change default route from fa4 to nex hop and that was solution to my problem.
THX.
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