Cisco VPN :: L2L VPN With Static NAT To Hide Internal IPs On 1841 ISR?
Mar 14, 2011
I have configured a L2L VPN on a Cisco 1841 ISR. I am statically NATing some of my internal hosts to IP addresses that are included in the encrypted traffic. Please note that not all of the internal hosts are being NATed. I am doing this to hid some of the real IP addresses on the inside network. I have confirmed that the VPN works, as well as the NATing of the VPN traffic. I have traditionally configured L2L VPNs on Cisco ASA 5500 series appliances, and this is my first attempt with the 1841 ISR. I just want other to take a look a see if I missed anything, or, could I have done some of the configuration more efficiently. All comments are welcome.
I am in trouble with my cisco 1841 configuration.The "what I want to" schema: very external IP ( AAA.AAA.AAA.AAA ) in the internet cloud => | cisco 1841 external IP BBB.BBB.BBB.BBB | => internal computer IP CCC.CCC.CCC.CCC
I am in trouble with my cisco 1841 configuration. The "what I want to schema":very external IP ( AAA.AAA.AAA.AAA ) in the internet cloud => | cisco 1841 external IP BBB.BBB.BBB.BBB | => internal computer IP CCC.CCC.CCC.CCC
Steps (this what I think should be done):
1. Find all packets from A by acl
2. Route finded packets throught cisco1841 directly to internal ip address
I used the GRE tunnel site to site VPN with 2 cisco 1841 routers. Behind one of the router R1, I used cisco ASA 5510, now my vpn is connect between two routers, but from R2 other site cannot access to LAN behind the firewall. From R1, also cannot route to local network, from local network can access to R1, I think cause of NAT . So how to configure to route internal network from R1 & R2 with VPN.
I have nated my 184.108.40.206 255.255.255.0 into my internal server 10.1.10.164 , i can ping the out side server but the internal server is not accessible from out side static (Database-Servers,interface-sms) 220.127.116.11 10.1.10.164 netmask 255.255.255.255icmp permit 18.104.22.168 255.255.255.0 interface-smsroute zemen-sms 22.214.171.124 255.255.255.0 10.131.199.201 1access-list Database-Servers-in extended permit tcp host 10.1.10.164 host 10.185.62.144 eq 9090access-list Database-Servers-in extended permit tcp host 10.1.10.164 host 10.185.62.144 eq wwwicmp permit host 10.185.62.144 interface-smsi can ping the out side server 10.185.62.144 with out a problem . from the server 10.185.62.144 i can ping untill 126.96.36.199 and it will not ping the natted server 10.1.10.164. as u seen the accesslist ping is permitted.
VPN 1841, and static nat. I have to create VPN to connect to remote network, but problem is that they already use same subnet as mine. How to configure static nat on cisco 1841 so static nat will work and address will be translated in different IP when connection trough VPN.I have address 192.168.235.1 and I want to translate to 192.168.100.1,This 1841 is border router, and all VLNAs and VLANs routing is on 3650.
I have an ASA5510 running 8.2 code and I have over 200 static nats from the outside to the inside interface and that is how I expose our systems to the Internet. If this inside interface fails we also have a bypass interface that also terminates on the internal network but I am not sure how the nats will behave given they are statically mapped to the inside.
ASA 5510I'm trying to add a static NAT for to allow access to an internal webserver on my DMZ. I've added the config, however i'm still unable to get to it from the outside. I'm able to ping and browse the server from the LAN and I'm also able to ping the external interafce from the outside, but just unable to browse.I've turned on logging and the error I'm getting is "Inbound TCP connection denied...flags SYN on interface outside"
I have a Cisco 1841 with a DSL and 3G HWIC interface. I would like to setup the DSL as the primary link and then use the 3G as a backup interface. I am trying to accomplish this using the Floating Static routes with SLA object tracking.
I have tried various options, like having two tracked routes, one tracked route, changing administrative distances, multiple SLA's, etc etc.
My problem basically is that when the DSL (Dialer0) goes down and the 3G (Cellular0/1/0) takes over, that the SLA never changes back when the DSL is available again, so that the DSL can take over as the primary link again. [code]
I have a Cisco 1841 router at home with version 12.4(13r)T advanced ip services. The setup is extremely simple:
1) PPPOE dialer to my service provider over ADSL 2) Nat overload on the dialer interface. 3) 2 V LAN s one for home network (wired) and one for wireless both v LAN's are connected through interface v LAN s respectively.
My problem is when I configure static NAT to map RDP or any other protocol to inside hosts this does n`t work. " ip nat source static tcp 192.168.20.3 2222 interface Dialer1 2222 ip nat source static tcp 192.168.20.3 3389 xx.xx.xx.xx 3389 extendable ip nat inside source list 20 interface Dialer1 overload "
When I open wire shark and sniff the traffic on home computer which is the one I`m trying to reach I can't see any traffic. And While performing Nat debugging I am also not able to see traffic going to that port (for example 3389).
I have just purchased an ASA 5505 for my remote users to access our internal network. I have followed all the setup instructions I can find. I am able to establish a VPN connection using the Anyconnect client and can see some of my internal network. (Basically, only the subnet of the internal interface) However, I have several subnets inside my LAN which are routed by another switch inside my LAN. I have built in the correct static routes so that the ASA will send traffic to that intenal routing switch for any subnets not part of it's inside interface subnet. I can see and ping those subnets from the ASA itself but the AnyConnect clients cannot.
I running site-to-site IPsec VPN in Cisco 2811 IOS 12.4 both site. Here I encounter a problem to access server on Site A from Site B
Site A having Leased Line connected to router with Public IP. I have done static mapping 1 web server to Public IP (NAT). This to allow external users to access the server via Public IP. At the same time, users at Site B would need to access to same server via Internal IP since they have Site-to-Site VPN established. But once I done Static Mapping (NAT), user at Site B unable to access the server at Site A using its internal IP. But external user can access server via Public IP. What went wrong here. Do i need to add extra command to get this done?
One of my internal servers requires it to be available to the internet I am having a hard time allowing it to be NATed through my Ciscc 2801 router. It seems as though im missing something small. From what I can gather it seems as though its as issue with ACL, but im not sure. I have ran the following command: ip nat inside source static tcp 192.168.5.1 ***WAN IP Address*** 8443 extendable Then I tried to add it to the ACL via this command: access-list 150 permit tcp any host ***WAN IP Address*** eq 8443
Here is a copy of my config.
IP 172.19.3.x sub 255.255.255.128 GW 172.19.3.129 Ciscso 2801 Router
I guess i am just getting old and forgot how this works, or i have an IOS load with an undocumented feature in it.A customer of ours wishes to have their exchange server appear to the outside world on a seperate IP address as their public pool address is.in the past this has not been an issue, however in the current configuration we are unable to get the source address to appear per the NAT statement it always sources on the overloaded IP. below is the relevant NAT config, am i missing something, or have i hit a IOS feature? [code] There is a 45% chance i have forgotten everything i learned on the NOC desk and a 50% chance that it is somethine really stupid and 5% IOS is broken
I wanted to move to the cisco arena, and having a bugger of a time figuring out simple nat/pat rules combined with access lists. I've been reading Richard Deal's Cisco ASA configuration book, googling the heck out of this simple problem and can't see what I'm missing.
I have an ASA 5505 unlimited security plus license running 8.2(3) and a simple network, 192.168.0.x internal, 192.168.3.x dmz (not even touching that yet!) and outside I have a /29 subnet of addresses, 25 is the gateway, and 26-30 are my addresses.
I have simple dynamic nat set up on the .26 address to nat to 192.168.0.x. All I'm trying to do is port forward a simple tcp port I set for my linux server (192.168.0.2) on the inside, for arguement's sake, it's 2222 (it's not really). My outside vlan 50 is X.X.X.226 255.255.255.248 , can I make a static nat (inside,outside) x.x.x.226 192.168.0.2 netmask 255.255.255.255 ?
I tried using (inside,outside) x.x.x.230 192.168.0.2 netmask 255.255.255.255 and that didn't work either. Is it not possible to use two external addresses to hit the entire /24 range AND a single server?
My access rule for this nat is permit tcp any 192.168.0.2 eq 2222 (where I'm using 2222 for my ssh port). then I apply that access list to the access group interface "outside".
I thought the outside interface would do a proxy arp (since I do not have the sysopt noproxyarp command) for my 227,228,229, and 230 addresses where .226 is my internal nat for all my internal machines i.e. 192.168.0.1 -> x.x.x.226 . I had this working like a charm before with my fortinet, so I know I have systems listening.
I am having some trouble configuring dual NAT on a Cisco 1841.
The 1841 has three interfaces. Fa0/0 - LAN Fa0/1- Different private network Fa0/1/0 - Connection to DSL modem
NAT overloading is configured on Fa0/1 and we have traffic that must be router there. We would like to have all internet access go through the DSL modem. Currently internet access is obtained through fa0/1 but is not ideal. I have floating static routes configured if the DSL link goes down. (Which is currently unplugged) I do not have physical access to the router at this moment. We would like to keep the config a simple as possible. It seems like route-maps may be one of our only options.
I have a 1841 router attached to 2 ISP's. Each ISPs provides different bandwithd. I want to do load balance between them, but I want to do some sort of weighted load blance, so as to assign more traffic to one ISP than the other. A kind of 70/30 (70% of traffic via ISP1, and 30% of traffic via ISP2).Is there a way to acomplish that? I already tried creating bogus /32 routes, but "cef" seems to be more clever and groups the bogus routes as one gw.
Basically I have an internet router (1841ISR) with 1 internal (LAN) connection and 2 internet connections. What I want to do is route specific traffic for 3 of my internally hosted services (smtp, https, etc) through one internet connection (fa0/0) and then route all other traffic through the unmanaged/dynamic IP ADSL connection (Dialer 0).
I'm working on setting up a template configuration for the Cisco ASA 5505 device that we'll use to configure more routers for various client needs. One of the requirements requested of me is the following: Internal hosts assigned a DHCP address are blocked from the internet Internal hosts with a static IP are permitted access to internet All internal hosts can communicate regardless of state
Now, I'm fairly new to this and I'm certain my terminology isn't correct so googling the problem has been fruitless. I have followed basic configuration guides and have configured the device to hand out DHCP addresses to hosts plugged in ports 1-7. If I'm plugged in and specify my address manually in the OS I am blocked from any access so I can only assume there is an access policy or some rule preventing me from authenticating against the router despite having set up VLAN1 to be the entire class C subnet. What sort of steps would I need to do to configure this? New access lists. For the record, the dhcp addresses are in the range of 10.100.31.64-10.100.31.95. VPN users are assigned an address from 10.100.31.220-10.100.31.240 and there seems to be no issues with that configuraiton. I don't wish to constrain what addresses a user can use should they specify a static IP (10.100.31.5 should be just as valid as 10.100.31.100).
Currently i am having a scenario where i have setup RV042 and which is connected to Microsoft Forefront 2010. PPTP works fine only on rv042 subnet but i am not able to access the "internal" network of TMG.RV042 (172.16.1.1) ---> TMG [external] (172.16.1.2) ---> TMG [internal] (192.168.1.1) Is there any way through static route to access the TMG internal network through RV042 pptp server?
We use filter rules on an ASA5510 firewall to direct clients to a web filtering server which generally works very well. However lately we're finding that despite having more web filtering licenses than users, the web filtering licenses are being consumed up, mainly because of a recent increase in the rollout of ipads, iphones, androids etc. We could deploy a proxy server in the wireless DMZ to make all the wireless devices appear to web filter as a single IP, and apply a single policy, but that brings it's own problems. My question is: Is there a way to hide them all behind the interface IP instead, so that all wireless devices appear to the web filter on the LAN as the wireless dmz interface IP rather than the wireless device IP?
I Lease fiber between two locations, My operator limiting number of MAC addresses to 8 macs. Is there any possibility using some feature available in the Cisco 3750 switches to (hide mac addresses) encapsulate traffic witch flowing via operator network ?
I need to send data between locations with 1Gb/s speed. If 3750 switches can't do that, which models of switches 1 or 2U can do it. May Metro switches ?
how to hide Wireless SSID via Wireless controllers (one I am using is 5505)
Currently anyone can attmept to login to it as i cant find any options to hide it! Screen shot below)
what measures I should take to secure the APS and from access, currently considering port security and static mac addresses on ports; traffic is already got ACLS on its vlan. I have little to no experience on Wireless devices.
I just want to know how or is it possible to hide sent/receive packets from the Router I cracked few days ago?I'm using wifi card airlive wl-1600 usb and the router is TP-Link.I mean how much is possible to hide my connectivity and everything from me with this router?
I know that when you surf the web, websites can log your IP & MAC address.If you get my jist, I don't want my laptop to be flagged on a few web sites I have been on.My plan is to use another pc, that has a wireless braodband dongle from a mobile phone company.The pc will be attched to the wireless router via Ethernet, but banned from access the web via the router. This way I can connect remotley from my laptop.
I have a program that connects to a game I play and does some actions on my game accounts (selling items etc).
I have set up several accounts to generate "income" in game and want to alter/hide the IP address shown connecting to those accounts so that my own IP is only associated with my main account. However it's an MSDOS program and I dont want to alter the IP shown/used for other programs on my pc.
Is there a way to alter the IP shown for specific programs only? And will it handle MSDOS programes?