2 Routers Connected To One Modem For Public / Private Network

Jan 27, 2012

I'm planning to set up a network with two routers and one cable connection. One router will be for public wifi at my business and the other will be for my Point of sale system and private use. I think I have it figured out but want to double check the set up. Someone tell me if this isn't correct or if there's a better way of doing it.Cable modem --> connect via ethernet to Router #1 WAN port. Router #1 Lan port 1: connect via ethernet to router #2 WAN. Now, router 1 and 2 will have two different subnets; 192.168.1.x and 192.168.2.x respectively. Router #2 is the one that I should use for my private network and for the POS system since it can't be accessed by users from router #1 correct? I have DD-WRT installed on both routers but I plan on putting Tomato firmware for router #1 to limit bandwidth for public wifi and keep DD-WRT installed for router #2.

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Connecting Two Routers To Have Private And Public Wifi?

Apr 2, 2012

I just moved into an apartment where the internet is being provided to me via wifi (open). The landlord doesn't have a private network, he is with me. What I'm was curious about is if it is possible for me to use a second router to create a secured network for all my devices? My thought would look like this: ISP>Landlords Router>wireless>MyRouter. I know you can have private and public wifi but the two routers have to be connected. I haven't talked to him about the fact that he needs to secure his router mainly because we never cross paths.

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How To Change Windows 7 From Private To Public Network

Jul 25, 2011

I have an existing network with several computers running Vista and XP. My new computer has Windows7. The WIN 7 computer can access the router and the internet. But it is invisible to the rest of the network. It is currently set up as "private network". I think it should be "public network". How / where can I change it ?

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Cisco VPN :: ASA5505 VPN Private Network With IP Public

May 19, 2011

My partner imposes that i create a VPN connexion with CISCO ASA5505 and send requests by public IP  on my private network.Is it possible to create NAT rules with this possibility?

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Home Network :: Private LAN And Public Internet Connectivity?

Oct 5, 2012

In my office we have a private LAN of having no access to internet/broadband. To connect to internet, we do it by using broadbandconnection/Modem from MTNL. Both things require a separate NIC card. My query is "Can I use my BroadBand Modem to connect to internal LAN". I have heard this is possible by some suitable changes in Current Control Set in Windows

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Networking :: WNDR3700 To Add Public IP Addresses To Private Network

May 26, 2011

I have set up a private domain network at home. I have a domain controller, a DNS server, and a DHCP server all running on one Windows 2003 Server machine. I have about 10 other machines around the house, getting their IP addresses from this DHCP server.

I have a Netgear WNDR3700 router.

I am about to get 5 public IP addresses from my ISP, and I would like to make some of these machines publicly accessible (while still accessible from the other machines in the network).

I found this link that says on my web server (one of the public machines), that I should use a second NIC and set that up to connect to my router (and get a private IP address from my DHCP server).

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Linksys Access Point :: WRVS4400N Broadcasts Two Different SSIDs - Public / Private Network

Aug 11, 2011

I have a WRVS4400N that brocasts two different SSIDs.  One is a public network and the second is a private network.  Right now, both SSIDs are pulling from the same DHCP server, but I would like to seperate the public from the private.  How can I seperate these SSIDs by vlans?  I can't seem to get the vlans to route to sperate ports.
This is my vlan settings.  I have two DHCP servers right now.  One is in an isolated network plugged into Port 3 of the WRVS4400N.  The other is on the production network, plugged into port 1 of the WRVS4400N. For some reason, whenever I connect to SSID Public, it won't pull an IP from the DHCP on port 1, it only pulls it from the one on port 2.I know there is three SSIDs here, the Static one is going to be the same network as the EMS one.

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Cisco Routers :: RV042 DDNS Connected In A Private Subnet

Feb 15, 2011

my RV042 is not able to propperly update my ddns. If you try to resolve my dyndns subnet kitus-network.dyndns.org you will get How can I make the router update my ddns with the real public ip rather than the private ip it "sees" on the WAN interface?

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Cisco Routers :: RV042G Fails To Work With Public Wan IP When Connected To SG300?

Feb 6, 2013

Am using a RV042G with a Fiber Optic connection terminated on WAN1 It was working fine untill received a new IP pool . When we configure with the ip on wan 1 and connect the SG300 the WAN Status shows connected but no internet connection. The wan ip doesnt work. If i replace the RV042G with a Netgear Firewall router The connection works fine with the WAN IP.
The network connection is very simple. What is that is not letting RV042G work with SG300?

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Cisco :: Possible To Use 1 Private IP Through VPN And Same Mapped With Public IP?

Aug 25, 2011

Is it possible to use 1 private IP through VPN and same private IP mapped with Public IP? For example is configured in VPN tunnel. i m able to ssh on both ends. ( VPN phase 1 and phase 2 gets completed)But when i map with some public IP problem starts. when i try ssh i see public IP in my destination firewall logs. IPSEC: Received an ESP packet xx.xx.xx.xx "mapped public IP". The decapsulated inner packet doesn't match the negotiated policy in the SA, The packet specifies its destination as

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How Can A Public Ip Be Traced Back To Private Ip

Mar 1, 2012

How can a public ip be traced back to private ip. for instance if the ip is it is traced as

I thought it could be VPN but then u still need a public facing ip , or can it be the fact that the public ip is router to nat and from nat to internet but then 10 range will need to be converted back to public which does not happen as from the private it moves to the next router which is an isp device and not clients one?

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Set Up A Public And Private Password On Single Router?

Jan 9, 2013

is it possible to set up a public and private password on a single router so that the public connection can be dissabled without having to turn off the private one?

I have some unruly housemates that like to try to take advantage and i only have one cat5 cable and that is already connected to a computer. i have 4 other devices that i use my wifi on and i want to be able to use them without letting my roomies use my connection. and only allow them to use the web during the day.

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Linux Server With Two Static Ip - Public / Private

Dec 14, 2011

Is there a simple way to have a web server have both a static public ip (I have a block of static IP's) and an static private ip (ex I am running a web project management application....

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Cisco WAN :: ASA5505 Converting Private To Public IP For VPN

Aug 18, 2011

We have a VPN router(ASA5505) which connects to the client, B. IP address for one si 195.xx.xx.xx and for B it is 14.xx.xx.xx. Both can extablish a IPSEC VPN nicely.Now, B throws a condition that the IP coming thru the VPN has to be PUblic. They want it as such so that they can be routed across the VPN tunnel.It still can because the firewall does not do NAT.

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Cisco Firewall :: Map Public IP To Private In DMZ In ASA 5510?

Jul 22, 2012

I am now using ASA 5510 as a firewall device.I have configured 3 interfaces ethernet 0/0,ethernet 0/1,ethernet 0/2 as Wan interface, DMZ interface and Internal Lan interface. Internet is working fine from LAN as well as DMZ.The WAN interface use the Public Point 2 point IP(/30) Provided by the ISP and  another pool of Public Ip is also provided by the ISP (/28). Now I want to Map the /28 IP to some servers in DMZ . DMZ servers currently have private IP . Now the problem is how to Map the Public IP to those Private IP in DMZ servers.

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Cisco Firewall :: 5510 NAT Public Ip To Private

Sep 5, 2012

We have the setup as shown above, our requirement is to access mail server via ports smtp and pop3.But as the mailserver is hosted at internet users at site were not able to aceess. we need to nat a intranet ip with mail server ip and mail server ip back to intranet ip and provide the access.We use ASA 5510 firewall.

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EA4500 / How To Keep Office LAN Private From Public WLAN

Jul 22, 2013

I handle the network at a small business; it's not my primary job but one that I am in charge of. My boss owns a house next to the office that he use as a general meeting area and as a guest house for friends and family. The house is close enough to the office that our office WLAN covers most of the house.

Our office router (Cisco Linksys EA4500) supports a "guest" network, which is okay for people that pop in for meetings, but not so great for family and friends that may stay for several days or a week. The guest profile times out, and they have to reconnect. I have no way to set the timeout period for the guest profile. But mainly, there are several "dead spots" in the wifi coverage in the house.

There is an Ethernet cable running from the office to the house that is not currently being used. Optimally, I would just use the spare Ethernet cable to setup a seperate WLAN in the house. But I don't know how to do it so that the guests cannot get access to our office network.

I would like to leave the office network hardware and configuration unchanged if at all possible. I am open to purchasing something, and even flashing it with DD-WRT if needed. I just need a configuration that keeps the office network private.

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Cisco 504s - Public And Private IPs On Same Router

Feb 18, 2012

I have been tasked to install the first "hosted & managed" network setup at work. I've actually been tasked to clean this up, since one of the other engineers on my team botched the install. Here's my issue:

A small business customer ordered 4 VoIP phones/numbers, a T1 circuit, and a managed firewall service from my company. We provided them with Cisco 504s, T1 router with two Ethernet ports, a Layer 2 switch for their phones, and a Fortigate firewall to manage their network. They also wanted us to install & configure their Linksys wireless router for net access on their laptops and i Pads. The higher ups decided that V LANs were not an option, and they wanted to have the Voice and data on two separate Ethernet interfaces.

Here's the problem: In the initial work order our T1 router (an Adtran900 series - a reverse engineered Cisco OS) will connect the VoIP phones to the F0/0 interface (using the layer 2 switch) and act as the DHCP server, using Private IP adressing. In order to perform this, the first engineer enacted the Adtran's firewall, configured NAT, and setup an IP policy to allow the phones to communicate (allow any any basically). On the F0/1 interface, the firewall is connected. The Firewall is given a Public IP using the F0/1 address as the default gateway, and performs NAT to their internal data network. The problem is that outbound traffic works fine, and inbound/outbound works on the F0/0 interface where the phones are connected and the Adtran is performing NAT - but I cannot get access the firewall from the outside world. I know the issue has to do with the firewall on the Adtran router, and it trying to block inbound attempts to the public IP block assigned to the second interface. I attempted setup firewall rules to allow all traffic to that sub net and interface, but it did not work. As soon as I disabled the firewall feature on the main router, voila! - the Fortigate firewall was accessible from the outside world. But, this disabled their phones from working, as this disabled NAT for the private IPs for the phones.

Ideally I could use the switch and setup V LANs to segment the voice/data traffic, but that option was denied. I think the way we're doing this is over-complicated, but this is the desired configuration from my boss. He doesn't really understand V LANs and Firewall rules too well, so he wants the two interfaces approach. To make things even more complicated and redundant, I'll need to setup 1-to-1 NAT rules in the Fortinet firewall to allow access to the /29 we have allotted the client for their connections to Ford/GM/& Chrysler. I can't think of an efficient way to make this work - every scenario I come up with hits a roadblock. I've attached a network diagram so this can make some sense. The IPs have been changed.

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Cisco WAN :: 64530 - Migrating BGP Private ASN To Public

Oct 9, 2012

I have two link on two edge routes from same ISP for Active/Standby. I am using the private AS and ISP provided IPs, now i got own Public IPs and AS number. I want to publish my IPs and migrate the AS number from private to Public.  But currently i do not want migrate my device IPs. just want to  publish network and ASN.
current config is :-
Router 1 
router bgp 64530
no synchronization
bgp log-neighbor-changes


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Public / Private IP And Port Number For Remote Access?

Dec 23, 2012

I would like to understand how public IP works in remote access. I do have belkin router and when I access it remote I type my public IP and after it the port number for example xxx.xxx.xxx.xxx:80 and if I would like to access an IP cam remotely in the same network i would do the same thing xxx.xxx.xxx.xxx:5656 (public IP). I do know my Public IP is unique.Thus, its quite logical I can access my devices remotely. my understanding of the port number is application specific that addresses packets in different applications in the same computer. For example port 80 is for HTTP connection used browsing the web, for chatting in MSN i will use different port number specifically for MSN...etc. my question is how I can access my belkin router remotely by typing the public IP and the port number knowing that the port number is application specific not device specific? My second question is, is it possible to access two routers in the same network remotely?

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Cisco WAN :: 1941W-A/K9 / Static PAT / 2 Public IPs To Single Private One?

Apr 16, 2013

I have a customer who wants to do a static mapping in order to prevent any downtime for one of his public web servers. Any good example to follow? FYI, the edge device is:

CISCO1941W-A/K9 (configured as a zone based firewall)C1900 Software (C1900-UNIVERSALK9-M), Version 15.1(1)T

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Cisco Firewall :: 5520 - Two Private To One Public Email NAT Going

Nov 8, 2011

How to setup this Nat on an ASA 5520 running 8.3.2 code? I know this must be possible as I can do the same thing on my Check Point with no issues. I need to Nat two dmz mail servers to one public mx record. I will have an F5 to load balance inbound and outbound traffic from the mail servers. So I need to Nat two private IP’s to one public.

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Cisco WAN :: 1941 Cannot Translate Private To Public IP Address Using NAT

May 4, 2012

I have 5 workstations with 2 servers but the backup server (black) is shut down intentionally.I have 1 cisco gigabit unmanaged 8 port switch and 1 cisco 1941 vpn router.The cisco 1941 vpn router is configured for IPVPN connection to other branches.

1. Configure NAT to enable the 5 workstations to be connected to the internet thru the router to the ISP.
2. Configure NAT to enable the server to be accessed from outside using the public IP address provided by the ISP. [code]


1. I can ping other pc on network.
2. When I typed in the ISP's public ip address on the browser, i got into the modem user interface for configuration.
I still can't connect to the internet. When i do tracert, it stops on the hop and didnt continue. This shouldn't be the case since i want to connect using the GE0/1 outside port for the internet.

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Cisco VPN :: Private-to-Public IP NAT Through IPSEC VPN On 3000 Concentrator

Jul 27, 2011

We have to setup an IPSEC tunnel for a client that does not what to exchange private IP address information for security and overlapping address space reasons.  We will both be natting our source private ip address space as public IP address space and send those packets through the established tunnel.  Im using a Cisco 3000 concentrator. 

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Cisco AAA/Identity/Nac :: 881 SSH Login Using Only Public / Private Key Levels

Mar 10, 2013

I'm trying to make a setup on my Cisco 881 router, but I'm having some trouble.I've managed to configure logging in with a Public-Private key pair over SSH, but it's also still possible to log in over SSH with just a username and password. I'd like to prevent this, if possible. I imagine I might have manually configured this to be allowed at some point, but I can't quite figure out how I did this, as no matter what I've tried to remove, it keeps allowing this option. I still need to be able to log in with a username, because I want users to have different privileges.
Once I've logged in using the Public-Private key, I don't automatically go into privilege mode, even though the user is configured with a privilege level. I'd like to configure that users that I've configured to use a certain privilege mode, automatically go into privilege mode without a password prompt. I know it did this before I started using the Public-Private key (or before I used AAA, which was configured around the same time), so I wondered if it's possible to do this still.

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Two Routers Connected To One Modem?

Nov 10, 2012

We have a standard surfboard modem and a standard wired router. I recently purchased a wifi-only tablet thinking I could connect to an ad-hoc hotspot. This however isn't the case and now I can't use my tablet at home.I'm going to buy an inexpensive wifi router and just have that dedicated for my tablet. I've read that you can connect a wifi router into a wired router, but it requires a lot of mucking about with the settings. Then I remembered the USB connections that modems and routers have.can you have one wired router connected to the modem via a standard cable and also have a wifi router connected to the same modem via a USB cable?

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Cisco :: Dealing With Security When Merging Private And Public Networks?

Jul 18, 2011

We have a private network, multiple vlans etc. for our domain users/employees across several amenities. We also have a Public network, that we have managed by a 3rd party for guests/conference rooms/attendees.Private network is all static ips, mac restricted port security, as strict as possible from a security and PCI Compliance standpoint. The public network is all DHCP with hundreds of users. Having them physically separate has always been the best option. Separate switches, server, and I even have the uplinks separated on a 3825 router. However, unfortunately it seems as though that luxury is coming to an end.One of the meetings that is taking place is going to be at one of our outer amenities so I've got to push that "public" network through my network, over my backhaul to the other side.

My suggestion was to create a new vlan on the switches with the shortest path possible to get where it needs to go. This way the traffic never goes through our ASA, and it has a small footprint on our network, it plugs into the switch access port with the dedicated vlan at the entry point into our network, and leaves from an access port on the other end. To me that seems to be the best/most secure way to handle it. We're also in the process of rolling out Public Wifi through the entire property and since we'll want to push both Public and Private vlans over it....merging the two networks to a point is only inevitable. Especially since it will be going through a controller and the property covers a good 7000 acres.

A good IDS/IPS...other than already having port security on every port, I'd definitely like to know if somebody inadvertently cross connects the two networks and it starts flooding whatever vlan access port it's plugged in to with dhcp...especially since a lot of the laptop users on the domain are set to DHCP first with a static in the alternate for working at the office and remote.

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Cisco Switches :: Setting Up Public / Private Vlans On Sg300-52?

Mar 25, 2013

How to setup 3 SG300-52 (in L2 mode) as per this diagram:Port 1 on all switches should be able to talk to each other and access the blob at the right.The ports 25 on the other hand should only be able to talk among themselves in their own private vlan. They are to carry sensitive traffic. So I created 3 vlans, vlan 78 for ports gi1, gi51 and vlan 10 for port25,49,50 and a dummy vlan: 666 with the intent of segratating vlan 10 from vlan 78. My attempts so far have failed. ports gi49-50 are configured as trunk ports and gi1,gi51 as access ports as the following cli output (excerpts of the startup config):
vlan database
vlan 10,78,666
interface vlan 1
ip address


Ports gi1 can talk to each other and access the blob but ports 25 refuse to talk to each other. But as soon as I remove the access links to the blob they can! Obviously, at that point port gi1 lose access.Is such a topology feasable or even advisable?

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Cisco WAN :: 7960 - Static NAT Public-Private Forwarding On 887VA

Sep 3, 2012

So, I have a bit of a problem getting out Natted Cisco 7960 working with our external SIP providers behind NAT.
We have a block of IPs available to us, however when I asign a static NAT rule for the internal phone, outgoing calls are fine but incoming provides no audio.
We have no ACL blocking or anything, it's fully open to the outside world with the IP assigned to it via NAT.
Our static NAT rule for the phone:
ip nat inside source static xxx.xxx.xxx.xxx
NAT is configured on the phone, with the external IP set correctly.
Also, after a while, it seems as the the registration times out or something because incoming calls no longer work.
I thought a static NAT rule would just allow full access to incoming connections to the internal IP specified? Our main router config (with unnecessary information removed):
version 15.1
no service pad
service timestamps debug datetime msec


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Cisco Firewall :: Using VLANs With ASA5505 For Private And Public Internet Access

Oct 2, 2012

I am trying to provide internet access to public and private SSID's on Cisco AP541n using VLAN's connected directly to ASA5505.  VLAN1 is inside interface (private) and VLAN12 is wlan interface (public SSID). The AP541n is plugged into switch port 0/7 on an ASA 5505.Port 0/7 is configured as trunk mode.  I have internet access when connected to private SSID but no internet access when connected to public SSID. why I can't access internet on public SSID? 
logging class ip history emergencies
mtu inside 1500
mtu outside 1500


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Cisco WAN :: 887Va To Support Both Public And Private Addresses On Inside Vlans

Nov 27, 2012

On an 887VA running 15.x IOS, is there a way to support both public and private addresses on inside vlans? The outside interface is public static ip, so the requirement would be to not nat anything if coming from inside vlan10 but nat if coming from inside vlan20.I didn't think this was possible since the outside interface would have to use an outside nat command that would not be ignored for traffic coming from vlan10.

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Cisco Routers :: RV180 Use VLAN1 For Internal Private Network

Sep 7, 2012

My plan is to use VLAN1 for the internal private network and VLAN2 for free public wifi. My question is can I use a PC on VLAN1 to configure/manage my access points? There are no dedicated PCs on VLAN2.

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Cisco Switching/Routing :: 3750V - Mixing Public And Private Networks On Same Switch

Oct 23, 2012

We have many remote offices that we want to add public wifi and a couple of other services that would be completely outside of our internal network.  Each office has a 3750 with plenty of open ports.  How can I safely create a vlan for public access on these switches which currently have our internal network on.  I have read that people are doing this to save on the cost of purchasing a dedicated switch.  Some people are using access lists and one person mentioned creating a private vlan for the public network.  I looked up private vlan and it seemed bit confusing.

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