Site to site VPN with router IOS

I want to create a VPN site-to site on the Internet. On the remote site, aside from the VPN to the head office, there should be no traffic not allowed in internal from the Internet to the network and that there should be no traffic from the internal network to the Internet allowed. The internal network will run a private 192.168.x.x address range.

I'm going to use a Cisco 2811 router integrated of services on the remote site and this will last an IPSec VPN that will end a hub at Headquarters. I understand that this router has an IOS and IPS firewall built in.

Would I be right in thinking that because I don't want to have access to the Internet (except VPN) or should I configure IOS firewall features on the router? And there is no point in the configuration of the features IPS wouldn't?

My thought is that only an entry in list of unique access to deny pi a whole applied inbound to the interface that connects to the Internet would be the best strategy. I think that the command "sysopt connection permit-ipsec" should allow the VPN to form even with the ip address to deny any any ACL (or is it just a Pix command? If Yes, then I have to allow ESP and UDP 500 (ISAKMP) from the public address of the hub at Headquarters to allow the VPN to form wouldn't I?).

Think I'll probably expand slightly the access list to allow the icmp Protocol, ssh and https traffic from the IP address of firewall seat outside so that I can monitor the remote site and access it safely if the fail VPN.

And I wouldn't need one access list on the interface connected to the internal network I would like because the range of addresses would be not routable, so they would not be able to initiate connections to the Internet (all the trffic to the remote site is specified under a valuable traffic to bring up the VPN)

Use one of the IOS Firewall inspect commands or the IPS would be useless and have no effect in this case wouldn't it?

I really just need to know if the ip address to deny any any ACL on the external interface on the remote site is the best solution (and the simplest), and whether it will be safe.

We used to use fiewalls Pix for remote VPN site to site, Amazon refuse incoming connections on the external interface by default but now I have been informed that these series 2800 routers will be used later, so I would get my thoughts straight and be able to build safe to do the same work all existing PIX are doing (they are all installed for just the VPN at Headquarters as in) the first paragraph).

I would like any advice or thoughts on the subject. I don't know there must be a ton of people who put routers for the same purpose.

Thank you in advance.

Pete.

Pete

I did a lot of implementations site VPN to another using IOS routers. They work very well. Based on my experience I offer these comments and I hope that they will help you:

-you don't want a list of incoming access on the external interface, but you want more in it than simply refuse an ip. There is no permit-ipsec sysopt connection in IOS so you want to certainly allowed ISAKMP and IPSec/ESP. I suggest that you also want to allow SSH. I would like to allow ICMP but only starting from the address space of the network head end. I do not allow HTTPS since I generally do not allow the http server on the router. If you want HTTPS then certainly enable it. To facilitate the ping and traceroute on the remote I frequently allow icmp echo-reply, timeout and unreachable port from any source.

-I want to put an inside interface access list. There are certain types of traffic that I don't want to send from the Remote LAN. I have usually refuse any trap SNMP or snmp for LAN devices and refuse out of the local network icmp redirects. I also often configure RPF controls inside interface to catch any device which is misconfigured.

-If you want to allow SSH when the VPN is not active (and I highly recommend that you do) then you will probably need to configure at least 1 (and maybe more) users and password of the router ID. And you want to configure authentication on the vty use local authentication if the head end authentication server is not available.

-I'm not clear from your description if you plan to run a dynamic routing via the VPN Protocol. I wish I had a dynamic routing protocol because I want to announce a default route to the remote control via the VPN. I do not locally configure a default route on the remote router. This way if the VPN tunnel is up there is a default route pointing to the tunnel and if the VPN tunnel is not up then there is no local route by default and users on the remote database can not access the Internet. It is a simple and very effective method to ensure that all user traffic must pass through the central site.

-regarding the routes defined on the remote router, my approach is that I define a static route for the endpoint of the tunnel to allow the tunnel to implement and I set up static routes for the subnet to the head of line I can SSH. And I do not configure other static routes the on the remote router.

-You probably want to disable cdp on the external interface and also to disable the proxy-arp (and I don't make any ip unreachable).

-There is frequently a problem when using VPN site-to-site with fragmentation. If a device on the local network sends a frame of maximum size, and then the router needs to add additional headers for IPSec, then the frame is too large and requires fragmentation. I like to use tcp adjust-mss ip to control the chunk size for TCP traffic and avoid any problems with fragmentation.

-I don't think you want to set up the firewall or IPS from the features of IOS on the 2811.

I hope that your application is fine and that my suggestions could be useful.

[edit] after posting my response, I read through your post again and realize that you make to a VPN concentrator. The approach I have proposed on the execution of a routing protocol works for me because I usually have a router IOS in mind. It would not work to connect to a hub.

HTH

Rick

Tags: Cisco Security

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Site to site VPN (ASA-> router IOS, with two interfaces) help

Dear,

I need help to configure VPN from Site to Site of cisco ASA to the IOS router, the router has 2 WAN links, a primary and secondary backup.

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I have a question about the site to site VPN with router.

Internet <> router <> LAN

If I have a VPN site-to-site configured on the router above with another site. I configured to block incoming Internet connections with the exception of VPN to access list. What are the risks of the LAN is exposed to threats from the Internet? Recommend that you put in a firewall between the router and the LAN, or replace the router with a firewall?

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Hi Amanda,.

Assuming your L2L looks like this:

LAN - router - INTERNET - Router_Remote - LAN

|-------------------------------------------------------------------------------|

L2L

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Design of the area Guide of Application and firewall policies

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http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a0080aa5be1.shtml

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Newbie Help Needed: Cisco 1941 router site to site VPN traffic routing issue

Hello

Please I need help with a VPN site-to site, I installed a router Cisco 1941 and a VPN concentrator based on Linux (Sophos UTM).

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Please, what missing am me?

A few exits:

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isakmp crypto #show her

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IPv6 Crypto ISAKMP Security Association

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local ident (addr, mask, prot, port): (192.168.20.0/255.255.255.0/0/0)

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current_peer 62.173.32.50 port 500

LICENCE, flags is {origin_is_acl},

#pkts program: encrypt 0, #pkts: 0, #pkts digest: 0

#pkts decaps: 52, #pkts decrypt: 52, #pkts check: 52

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Errors #send 0, #recv 0 errors

local crypto endpt. : 62.173.32.122, remote Start crypto. : 62.173.32.50

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current outbound SPI: 0x4D7E4817 (1300121623)

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SAS of the esp on arrival:

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calendar of his: service life remaining (k/s) key: (4491222/1015)

Size IV: 8 bytes

support for replay detection: Y

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The parts of the configuration you posted seem better than earlier versions of the config. The initial problem was that traffic was not in the VPN tunnel. That works now?

Here are the things I see in your config

I don't understand the relationship of these 2 static routes by default. It identifies completely the next hop and a mask the bytes of Middleweight of the next hop. Sort of, it seems that they might be the same. But if they were the same, I don't understand why they both make their appearance in the config. Can provide you details?

IP route 0.0.0.0 0.0.0.0 62.X.X... 121

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This static route implies that there is another network (10.2.0/24) connected through the LAN. But there is no other reference to it and especially not for this translation. So I wonder how it works?

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HTH

Rick

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Thank you

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Robert

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Hi Thomas,

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It's that everything works perfectly.

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Now we want remote users who connect to the seat to also be able to access resources in the remote offices.

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----------

#10.10.10.0 = Network1

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Hi Rollo,

You can not be implemented for a simple reason, it is not supported on the version 6.x PIX. It relies on the PIX 7.x worm but 7.x is not supported on PIX 506. Thus, in a Word, it can be reached on a PIX 506. If you have an ASA, a PIX 515 running 7.x, a router or a hub as well, it can be reached.

HTH,

Please rate if this helps,

Kind regards

Kamal

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Hello everyone

Please I need your help.

We have a headquarters office and up to 60 is BranchOffice, we want to create VPN network between its. so let's deploy 2 router cisco esy vpn server with HA (HSRP) at the Headquarters Office and all branches have Connection ADSL and they will use just the cisco vpn client to connect to the Headquarters Office.

My question is: is it possible to do it just with the client vpn cisco without purchased for any exercise bracnh a cisco router to create an ipsec tunnel because it is so expensive?

It depends on if the routers to offices can handle NAT with several internal VPN clients to 1 IP address. Most of the new material should be fine. Keep in mind the maximum limit of the VPN client, with 60 agencies and 5 people each of whom you are above the limit.

Michael

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Hi guys,.

I would like to configure two Cisco 2801 using IPSEC/IKE. Both routers are connected to the internet through DSL lines. The DSL line have RFC1918 address side LAN where routers connected to the internet face. I can do NAT on DSL modems.

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Site to Site VPN number

Hello

I am facing a problem in my site to site VPN configuration, router management site gets the address public IP of the DHCP server as I have built a dynamic crypto map on the router HQ

First phase ISAKMP is operational running, I am trying to ping the LAN 192.168.85.0 for the HQ 172.16.12.0 LAN but it won't go through and when I check the ipsec security associations I can see that packets are encrypted on the side of the branch and decrypted on the side of HQ but the HQ router no PING response at all and he saw not encrypted packets

I have attached my configurations, I had to hide some information just for safety

Help, please!

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Hello Mustafa,

Havinf a glance at your config, it seems you have not correctly configured on your HQ NAT exemption.
```
 ip access-list extended NAT deny ip 172.16.12.0 0.0.0.255 192.168.75.0 0.0.0.255 deny ip 172.16.12.0 0.0.0.255 172.16.20.0 0.0.0.255 permit ip 172.16.12.0 0.0.0.255 any deny ip 172.16.12.0 0.0.0.255 192.168.85.0 0.0.0.255
```
In this interesting ACL traffic is refused in the last. So it is not exempted from NAT, as ACL are processed in top-down, your valuable traffic is already matching permit statement in NAT ACL therefore subject to NAT on HQ. Refuse the declaration of exemption, interesting traffic NAT should precede the statement of license.

HTH

"Please note useful posts.

Site to Site VPN using an interface to Peer and LAN

Hello

I have an ASA 5580 to the site to site VPN with our partner. VPN connection is through my external interface and Local for the VPN network comes from the external interface too. Is it possible to do? Thank you.

drawing2.jpg

The layout you describe is contrary to the concept of basic firewall of the approved facility and no approved interfaces (upper and lower security level).

If your LAN is on the external interface, which is to stop remote users simply access it directly?

Cisco ASA Site to Site VPN IPSEC and NAT question

Hi people,

I have a question about the two Site to Site VPN IPSEC and NAT. basically what I want to achieve is to do the following:

ASA2 is at HQ and ASA1 is a remote site. I have no problem setting a static static is a Site to IPSEC VPN between sites. Guests residing in 10.1.0.0/16 are able to communicate with hosts in 192.168.1.0/24, but what I want is to configure the NAT with IPSEC VPN for this host to 10.1.0.0/16 will communicate with hosts in 192.168.1.0/24 with translated addresses

Just an example:

N2 host (10.1.0.1/16) contacted N1 192.168.1.5 with destination host say 10.23.1.5 No 192.168.1.5 (notice the last byte is the same in the present case,.5)

The translation still for the rest of the communication (host pings ip destination host 10.23.1.6 N3 N2 not 192.168.1.6 new last byte is the same)

It sounds a bit confusing to me, but I've seen this type of configuration before when I worked for the supplier of managed services where we have given our customers (Ipsec Site to Site VPN with NAT, don't know how it was setup)

Basically we contact the customer via site-to-site VPN hosts but their real address were hidden and we used as translated address more high 10.23.1.0/24 instead of (real) 192.168.1.0/24, last byte must be the same.

Grateful if someone can shed some light on this subject.

Hello

OK so went with the old format of NAT configuration

It seems to me that you could do the following:
- Configure the ASA1 with static NAT strategy
  - access-list L2LVPN-POLICYNAT allowed ip 192.168.1.0 255.255.255.0 10.1.0.0 255.255.0.0
  - public static 10.23.1.0 (inside, outside) access-list L2LVPN-POLICYNAT
- Because the above is a static NAT of the policy, this means that the translation will be made only when the destination network is 10.1.0.0/16
- If you have for example a PAT basic configuration to inside-> external traffic, the above NAT configuration and the custom of the actual configuration of PAT interfere with eachother
- ASA2 side, you can normally configure NAT0 / NAT Exemption for the 10.1.0.0/16 network
  - Note of the INTERIOR-SHEEP access-list SHEEP L2LVPN
  - the permitted INSIDE SHEEP 10.1.0.0 ip access list 255.255.0.0 10.23.1.0 255.255.255.0
  - NAT (inside) 0-list of access to the INTERIOR-SHEEP
- You will need to consider that your access-list defining the VPN encrypted L2L traffic must reflect the new NAT network
  - ASA1: allowed to access-list L2LVPN-ENCRYPTIONDOMAIN ip 10.23.1.0 255.255.255.0 10.1.0.0 255.255.0.0
  - ASA2: list L2LVPN-ENCRYPTIONDOMAIN allowed ip 10.1.0.0 access 255.255.0.0 10.23.1.0 255.255.255.0
I could test this configuration to work tomorrow but I would like to know if it works.

Please rate if this was helpful

-Jouni

Client VPN router IOS, and site to site vpn

Hello

Im trying to configure a vpn client access to an ios router that already has a vpn site-to site running. I don't see how the two can run on the same router.

So I guess my question is is it possible? and if anyone has therefore had a config that they can share or a useful link.

IM using a router 800 series with 12.4 ios

Thank you very much

Colin
```
ReadersUK wrote:
Hi
Im trying to configure access for a vpn client to a ios router that already has a site to site vpn running. I cant see how both can be running on the same router.
So i guess my question is can this be done? and if so has anyone got a config they can share or a useful link.
im using a 800 series router with 12.4 ios
Many thanks
Colin
```
Colin

It can be done. Look at this config example that shows a router configured with a site to site VPN and client vpn - connection

https://www.Cisco.com/en/us/Tech/tk583/TK372/technologies_configuration_example09186a0080094685.shtml

Jon

Site to site VPN with router IOS

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