Questions tagged [nat]

For questions about Network Address Translation (NAT), a method of modifying network address information in IPv4 packet headers.

21 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
1k views

Cisco 871, NAT, port formwarding and VOIP configuration - phone speaker buzz

I'm new to all Cisco stuff and I need to configure nettalk VOIP. I have Cisco 871 device with two ISP - one via PPP (public IP 666.666.666.666) and one via eth (public IP 999.999.999.999). Main ISP ...
2
votes
0answers
148 views

Cisco ASA static nat one-to-many from interface address to object-group

Syntactically, the following set of statements is valid (at least as of 8.3): interface Ethernet0/0 nameif OUTSIDE ip address 192.0.2.1 255.255.255.0 interface Ethernet0/1 nameif INSIDE ip ...
2
votes
0answers
161 views

Router as PPPOE concentrator, PPPOE clients unable to get to DMZed static NAT server

I've been trying to figure out this problem, and I'm just not up to the task. I have a Cisco 2911 router as follows: Internet connection on GigabitEthernet0/1. Which has it's own static IP: A.B.C.38/...
2
votes
1answer
945 views

using NAT with a difference IP/range from the outside interface + proxy ARP

I need to NAT the source address of the traffic from my local LAN going out of the ASA firewall. From the diagram above, my outside interface IP on the ASA firewall is set at 192.168.12.2 q1) Am i ...
2
votes
0answers
563 views

How to force route for MIP in screenos, multiple ISP untrust

Scenairo: SSG140 in HA configuration. Four interfaces: LAN (trust) eth0/0 172.20.0.0./24 ISP1 (untrust) eth0/1 1.1.1.130/28 ISP2 (untrust) eth0/2 2.2.2.194/28 ISP3 (untrust) eth0/3 3.3.3.130/28 ...
1
vote
0answers
24 views

Configure nat on src ip to dst port

I wondering about some workaround for issue that I have: I have 2 sources which generates multicast to 224.1.1.1 and port 12345. I'd like to configure on my Cisco IE 3000 NAT which will change the ...
1
vote
0answers
108 views

Cisco L2TP Tunnel and NAT

I have problems with NAT clients connected to an AP . This AP has an L2TP tunnel established to a Cisco router (7206VXR). The session is UP and the router can ping the IP of the client. The client ...
1
vote
0answers
546 views

VPN tunnel with duplicate subnets

I have been tasked to setup a VPN tunnel with an external party's network, but I hit a bit of snag. I am currently running a Cisco ASA 5510 with private subnets of 10.1.2.0/24 on the "inside" network....
1
vote
0answers
758 views

Access Extern IP behind NAT

I have found many articles, possible solutions to this topic, but no one seems to have the same problem as me. I am working on a Cisco 1812 Router with IOS 12.4. I have found some things like ...
1
vote
0answers
127 views

Network translation and port forwarding causing host to timeout

I'm trying to setup a small network, consisting of 3 routers and switches, and one L3 Switch: I have activated PAT on both router R1 and R2, to translate from the private IP addresses to the public ...
1
vote
0answers
89 views

NAT takes me to a wrong place

We have a 5555-x with multiple interfaces. Our Outside interface and DMZ interfaces have routable IP addresses and DMZ subnet is routed via IP address of the outside interface. Stripped for ...
1
vote
0answers
218 views

NAT is not working because of ACL and CLI command unavailable

I have configured ACL for NAT and PFR purpose. ios c1841-adventerprisek9-mz.151-4.M4.bin ip access-list extended PFR permit ip 192.168.0.0 0.0.7.255 any log route-map isp2 permit 10 match ip ...
1
vote
0answers
679 views

MPLS L3 VPNs and F5 Route Domains

I realize the F5 community might be the right place for this question, but this concerns routing design as opposed to an ADC design. We are planning to use F5's CGNAT module for NAT'ing our campus ...
0
votes
0answers
32 views

Masking all IP Addresses in a subnet to appear as one IP Address on the main network Using Siemens S615

I am trying to create a network setup that would take many devices that are working together and have them appear as one device or IP on a network using a Siemens Scalance S615. The setup would be as ...
0
votes
2answers
80 views

Why cant't IPSec's Transport Mode ESP be used in NAT64 although ESP doesn't sign the new IP header?

In RFC6146 stated: Any protocols that protect IP header are incompatible with NAT64. This implies that end-to-end IPsec verification will fail when the Authentication Header (AH) is used (both ...
0
votes
0answers
34 views

Cisco: NAT overload does not work on Serial point to point interface /32 address on Cellular modem

I have a LTE modem installed in a Cisco 1921 that is able to connect to the carrier network and ping out sucessfully from the router, however NAT hosts are not able to connect to the internet. There ...
0
votes
0answers
43 views

CMTS (DOCSIS 3.0) with CGN (CGNat)

For a new project/building I am working with the CMTS model MA5633-XB10 by Huawei. The usual way is done by implementing two DHCP servers in the same VLAN, from which the CPE gets the private IP ...
0
votes
1answer
883 views

pfSense 1:1 NAT Not Working

Next year, if I have the money for it, I want to get a dedicated server (either from Hetzner or OVH) and some IPs (maybe like 16 IPs). The server will have Proxmox and VMs will get their network ...
0
votes
1answer
120 views

Issue w/ Cisco router and failed NAT and static default route

I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...
0
votes
0answers
191 views

NAT overload and access to web resources

I have really bizarre problem in clients network. Clients have access to the internet via NAPT - I'm using several public ip addreses for this purpose. (I'll change ip addresses for obv reasons) ip ...
0
votes
0answers
285 views

Simultaneous dynamic and static NAT not working

Cisco 4200 series running IOS XE with a single public IP address and dynamic NAT, which works just fine. I am trying to add Static NAT to access a server (map external port XX to internal port YY. ...