Cisco WAN :: 1812 Change Source IP On NAT
Jun 8, 2012
I need to change the source IP of a packet for one of my NAT's.I currently have an Cisco 1812.I have an PPPoE connection as Dialer 0.I have another VLAN that is connected to an Netscreen SSG5 VPN gateway via another Cisco switch.I have a vlan trunk between the switch and the 1812. What I would like to achive is the following :-For any traffic going to the following three ranges make it apear as if it was coming from the VLAN50 address [code]I can ping my netscreen on 10.27.30.255 fine from the Cisco 1812. But any other PC fails, as for some reasion the traffic has a source of my Dialer 0 interface.How can I write a nat to change the source just for the tree destitnations ?
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Feb 20, 2013
Some network pros have setup our Cisco 3620 many years back during implementation.
I've just added a new server, with new ip, wanted to change the ip of ip nat translation in this router.
I did a show run, the config is this;
interface FastEthernet0/0
ip address 57.31.132.116 255.255.255.240
no ip redirects
[Code]......
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Nov 29, 2012
i want to configure a new cisco 1812.what i want is : we have 5 external ip addresses from our ISP.we want that the FE0 ( wan port ) can route all those ip addresses.so when we put a firewall on port number 8 with 1 of the 5 external ip addresses we have internet.and when we put a firewall with another external ip adres on port 4 we have internet.
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Sep 29, 2011
is it possible to boot the image from a usb stick on a 1812? if so, what are the requirements?
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Jul 28, 2011
I have Cisco 1812 connected to ISP's router Cisco 870. Both routers have switch module and when I'm connected with PC to 870 I can connect via VPN to remote location.When I'm connected to 1812 remote VPN doesn't work.Client computers are connected to 1812 and they can surf on internet just fine.
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Aug 27, 2012
I have a Cisco 1812 with IOS 12.4(15)T17.I would like to perform pppoe dialing using this device to my ISP. My ISP is using VLAN id 500 for Internet. I configure like below but seem unsuccessful. From the console, I can't even ping to internet.ip nat inside source route-map nonat interface Dialer1 overload.
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Mar 20, 2011
I am trying to get this VPN Client (5.0.07.0410) to connect to the remote LAN behind the cisco 1812. Here is my config. I am able to get everything connected and IP assigned to the client and can even ping local LAN and Internet but can't ping to the remote LAN behind the 1812. I feel it's a routing issue or an ACL issue.SHUMAMKERRTR>enPassword:SHUMAMKERRTR#sh runBuilding configuration...
Current configuration : 2910 bytes!version 12.4service timestamps debug datetime msecservice timestamps log datetime msecservice password-encryption!hostname SHUMAMKERRTR!boot-start-markerboot-end-marker!enable secret 5 password!aaa new-model!!aaa authentication login userauthen localaaa authorization network groupauthor local!aaa session-id commonno network-clock-participate slot 1no network-clock-participate wic 0ip cef!!no ip dhcp use vrf connectedip dhcp excluded-address 192.168.7.1 192.168.7.10!ip dhcp pool SHUMAKER network 192.168.7.0 255.255.255.0 dns-server 192.168.7.1 default-router 192.168.7.1!!ip domain name shumaker.nothingip auth-proxy max-nodata-conns 3ip admission max-nodata-conns 3!!!!!!!!!!!!!!!username cisco privilege 15 secret 5 password!!ip ssh rsa keypair-name SHUMAMKERRTR.shumaker.nothingip ssh version 2!!crypto isakmp policy 1 encr 3des authentication pre-share group 2!crypto
[code].....
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Aug 9, 2012
At the moment I am trying to connect to a DHCP ISP, but the connection only last for 10-15mins and then it will automatically disconnected. Every time I reset the WAN port , service back to normal for another 10-15 mins ><
[code]...
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Jul 24, 2011
we are trying to configure PPPOA over Ethernet on Cisco 1812 Router, we have 2 ethernet ports and no ATM ports, hence PPPOA must be applied at a global setting.
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Nov 1, 2011
I have 5 cisco 1812 routers that i set up in a hub-spoke dmvpn configuration between 5 sites. All routers have a secondary internet connection . Could i set up a second tunnel interface on each router to create a backup dmvpn that will use this secondary internet connection? i use EIGRP for routing.
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Dec 26, 2011
I am using Cisco 1812 as EZVPN server. I want to use Active directory for VPN user authentication. I am trying from couple of days but no success.With ASA, i am able to authenticate against AD, but not with IOS router. Below are my configurationsIf kerberos authentication is not possible, I would like to know the possibility of using AD as ACS external database. I am running both AD and ACS in the same server. If i can integrate AD with ACS, i can use TACACS or RADIUS for the authentication.
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Nov 30, 2011
im searching a list wich can show me all the cisco routers and witches that support USB. (axample : a 1812 router)
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Aug 29, 2012
I am using DHCP ISP , but the connection only last for 20 mins exactly and then it will automatically disconnected. Every time I reset the WAN port ,
service back to normal for another 20 mins ><
The are no log or any error message when connection timeout. the status of the WAN port is normal "Up Up".
I have tried this config on another ISP and everything work just fine !
Fiber converter -------> Cisco 1812 (FastEthernet1) --------->LAN
Router#sh runBuilding configuration...
Current configuration : 3205 bytes!
version 12.4service tcp-keepalives-inservice tcp-keepalives-outservice timestamps
[Code].....
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Sep 19, 2012
I just upgraded a 1812w from 15.1 to 15.2 and did NOT change any configs/passwords or anything else.
My WiFi Clients are not able to associate any more. Failure is:
Sep 20 13:59:19.384: %DOT11-7-AUTH_FAILED: Station 0001.0203.0405 Authentication failed
I can't find either a WLAN-configuration guide for 15.2.
relevant config:
dot11 ssid wlan2
vlan 2
max-associations 16
authentication open
authentication key-management wpa
mbssid guest-mode
wpa-psk ascii 0 password2(code)
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Jan 28, 2012
I'm having several issues with IPv6 and ZBF. I've narrowed one of them to a very simple setup. I tried 15.1(4)M in GNS2 and 15.1(4)M3 on a 1812.
The setup is
[PC] ----- [R1] ------ [R2]
R1 and R2 are interconnected by IPv6 only and there is a tunnel over that link to carry IPv4 from R2 to PC.
And I'm trying to ping PC from R2 with IPv4. We're looking at the R1 config mainly. (the other are included for completeness)
When I try to ping the PC from R2, I get this on R1 console:
%FW-6-DROP_PKT: Dropping icmp session [::]:0 [::]:0 on zone-pair zp_vpn_to_lan class cm_icmp with ip ident 0
Which really doesn't make much sense because zone vpn and zone lan are purely IPv4 and should never see IPv6 traffic as such ...
If I remove all ZBF related config, then traffic flows without problem.
R1 config
class-map type inspect match-all cm_icmp
match protocol icmp
policy-map type inspect pm_icmp
class type inspect cm_icmp
inspect (code)
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Sep 29, 2011
i'm having a problem establishing a pppoe session with a 1812 router. i've tried everything i could find online, even contacted the isp (all they said was that the modem should be in bridge mode, which it is).
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Aug 9, 2012
In last days I'm having problems with a Cisco 1812 device. It works for some time but then crashes and gives the same info.
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Jun 15, 2011
We are trying to get a video conference system (POLYCOM) up running. Thrue a Cisco 1812 router with Firewall feature set.
I Have heard in the past that there should be issues with Polycom and Cisco, but have actually never seen it.I can establish a video call from inside the 1812 to outside.
But when I try from outside to the public ip adress there is nattet to, then it reach the video system and die straight after, so there is never any video session set up.
I have tried to remove everything regarding firewall feature and passing true, so the only thing the 1812 should do is NAT. And still the same.
I can not see anything in the log on the router from the ACL's where I permittet everything, other then it connect on the port TCP 1720, as it should. This is the software I'm running on the router:
Cisco IOS Software, C181X Software (C181X-ADVIPSERVICESK9-M), Version 12.4(15)T3, RELEASE SOFTWARE (fc1)
When I search Google, it look like there is a lot issues with Cisco and Polycom, but I have not found any concret solution. Other then I should use a ADSL line with a public IP address. As we probably is going to do.
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Dec 27, 2010
I am simply trying to configure fail over configuration in my 1812 router. I have done some configuration on my router but my configuration is not working as i want. My router does not goes to secondary route until i unplug the primary interface cable on my router. when i unplug the primary cable it goes to secondary route and then i plug back primary cable the router come back to primary link.so my configuration is working when my primary gateway down but it is not working when internet goes down from isp end. i have attached my running configuration.
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Jan 11, 2012
Cisco 1812, Version 12.3(8)YI1..What does "none" mean ?Most of mac adressess in cam has specified interface, but several has none.
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Aug 9, 2012
At the moment I am trying to connect to a DHCP ISP, but the connection only last for 10-15mins and then it will automatically disconnected. Every time I reset the WAN port , service back to normal for another 10-15 mins >< The are no log or any error message when connection timeout. the status of the WAN port is normal "Up Up"I have tried this config on another ISP and everything work just fine!!!
Fiber connector -------> Cisco 1812 (FastEthernet1) --------->LAN
Router#sh run
Building configuration...Current configuration : 3205 bytes
!
version 12.4
service tcp-keepalives-in
service tcp-keepalives-out
[code]....
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Jul 29, 2012
I just received a 1812 model unit flash memory C class.
I cannot free the space from CF; after format, I receive the same amount of space:
Cisco-1812-II#show flash:
14450688 bytes available (17489920 bytes used)
Cisco-1812-II#format flash:
Format operation may take a while. Continue? [confirm]
Format operation will destroy all data in "flash:". Continue? [confirm]
[Code].....
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Dec 5, 2011
I'm using a Cisco 1812 to route traffic from a small location with 10 users.. Users are complaning about packet loss, and programs with live database connection is freezing..On the router i've checked one of the Fastethernet interfaces, and I can see that the input errors are increasing constantly. [code]
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Apr 6, 2013
configure a router 1812 as failover, I walk with fixed ip internet link in Fe0 (need to determine the mac) and a dynamic ip link in FE1, other ports with a single vlan dhcp 172.20.16.1
I managed to do DHCP, connect to internet, to make nat vlan. But I could not do failover and load balance neither.
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Mar 31, 2011
Just now my boss asked me to prepare to set up site-to-site VPN on Cisco 881 Integrated Services router to ASA 5505 router which is now running at the HQ side. I am now learning pdf file from Cisco which mention how to setup site-to-site VPN between Cisco 1812 IOS router and ASA 5505 router by using ASDM V6.1 and SDM V2.5. Can't find the paper for that Cisco 881 device.
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Dec 16, 2011
I have a nat statement to nat a subnet to a host address. Only the host address is allowed to traverse the VPN. However when I use a route map to do this, I cannot see NAT being performed and my VPN does not come up. When I use a static NAT for a 1 to 1 host translation I can see nat being performed and the VPN comes up. Using the route map method, the other party said our source IP is 0.0.0.0 0.0.0.0.
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Jul 24, 2011
I have a situation which requires some non best practice stuff to be done. There is a box behind an ASA that has a lot of code that references public DNS names and therefore needs access to itself and a number of other boxes on the same subnet via the public DNS names (that obviously resolve to public IPs). This traffic is dropped on some pretty fundamental ASA characteristics.I know this isn't really ideal, and it should be handled by DNS nstead, but I'm in somewhat of a bind and need to know if the ASA can allow this traffic.I figure I could match the traffic and exempt it from state-checking and that would probably work, but it's not a very graceful solution.
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Sep 23, 2012
why the command "source cpu rp" has been removed from IOS15.0(1)SY1. I can succesfully configure the following ERSPAN on 12.2 SXJ3 but not on ios 15.x. Did not understand why cisco has descoped this command.
monitor session 10 type erspan-source
shutdown
source cpu rp rx (--- 15.0 has no such option on 6500 )
destination
[code]....
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Feb 22, 2011
I have configured my Cisco 881 and it is quite stable but now I am working on some minor details.
I have several Public WAN IP addresses which are NATing to internal web server. When I go to the WAN IP at port 80 from the Internet, the NAT works fine and it maps perfectly to the internal Web server. However, when I try the same same WAN IP from the LAN which contains the web server, the Router blocks the traffic and I get nothing back.
I have verified that I can get to the Inernet from the LAN but it seems that I cannot go bfrom the LAN to the Internet and back into the LAN via NAT.
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Oct 18, 2012
we use the latest LMS version (4.2.2). Under Monitor->Performance Settings->IPSLA->Devices i see all devices. When creating a IPSLA collector not all devices are listed in the source section but in the target section. Why is this happening?
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Dec 11, 2012
I have been trawling the interenet looking for an answer to the i but to no avail.Can you change the source port that windows uses when it makes a connection to another host.
[code]...
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Mar 27, 2012
i have issue with whenever i m trying to download any file it's get upto almost 95-98%,but after suddenly stop.this issue with firefox, chrome browser
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Aug 22, 2011
Every year I attend a local motorsport event and I am usually responsible for providing a live online video broadcast of the event which I do using a website such as ustream.tv or similar. The event is non-profit so spending as little money as possible or none at all is the best option for us. We use a 3G card/dongle and a laptop with 2 or 3 webcams for the video feed....The results/scoring system in use at the event is controlled by the organisers and they have setup a VNC server where teams can connect with their laptops via a wireless network to view results, what I would like to do, is to include the results screen in my video feed. So somehow, I need to trick my computer into thinking that the VNC viewer software is a video input device.I have looked for something similar last year but didn't have much success, If separate laptops are needed, I have 3 windows laptops at my disposal and a macbook pro which will be on the same network. Whichever one will be most suitable for the task will be used.
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