Cisco :: Two Servers Using One NAT IP Address?
Sep 26, 2011
I have two FTP servers in our network, one that accepts inbound FTP connections from external clients and one that will be pushing out to external clients
Ideally i want these to both use the same external IP address, so should i configure a dynamic policy NAT rule for these two servers?
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Oct 24, 2011
When someone goes into a game (e.g. Minecraft) instead of typing an IP to join a game they simply type in [URL] and then the server gets added just the same as if you typed in an IP (123.456.789 sorta thing)
My friend used to do this on his website and it worked across multiple games, so people only entered his website and didnt need to remember the IP. if you type in [URL] in minecraft then u can add that server without the IP, thats what i mean.
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Oct 7, 2011
Just purchased a Cisco RV110W for our small business. We were told this was easy for us to use and secure enough for our small office and for our travelling sales staff to access our website.
We purchased 2 dedicated IP-addresses, 216.82.5.230 for access to one server, and 216.82.5.231 for access to a second server (these IP-Addresses given are just an example; not real).
These come into the single RV110W WAN port. The two servers are plugged into 2 of the 4 LAN ports.
But the WAN setup page only accepts one WAN IP-Address. So when we put in 216.82.5.230, the outside world can HTTPS into one server, but we don't know how to get them to HTTPS to the second server when the other staff uses 216.82.5.231.
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Jun 6, 2012
cant find server name for address...(server) : time out..15 nod is join to server(win2008R2) but new of nod is join for network error : computer name change....Note: This information is intended for a network administrator. If you are not your network's administrator, notify the administrator that you received this information, which has been recorded in the file C:WINDOWSdebugdcdiag.txt.An error occurred when DNS was queried for the service location (SRV) resource record used to locate a domain controller for domain puya.org.The error was: "No records found for given DNS query."(error code 0x0000251D DNS_INFO_NO_RECORDS)The query was for the SRV record for _ldap._tcp.dc._msdcs.puya.orgFor more information
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May 11, 2011
I coulden't visit any websites and it gave me an "error 105" something. So i tried connecting my other comp to the internet cabel with the same result. So i tried to find a solution on the web (wierless internet still worked) and stumbeld upon a similar problem were the answer was to manually fill in an adress in the "internet protocol version 4" properties in the "local area connection" properties. I then noticed that i dident have the "Obtain DNS server address" set to automatically and that the other manual boxes were empty. I then turned the auto on an i had access to internet. Is this safe? Cause i read somewere that DNS server addresess were provided by the company that provide you your internet service, and that you can be redericted to a fake website that can get a hold of your account information on it
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Aug 11, 2011
how to track webhistory of a particular system using its ip address...can i remotely monitor the systems webhistory using its ip address.
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May 22, 2012
I have a client that has 2 servers behind the same router. They have an IP block from Time Warner -> (x.x.x.18-.30) The router has the IP address of x.x.x.18. Server A (192.168.1.6) is setup with the forwarding of ports 22, 23, and 115 and can be seen with the ip address x.x.x.18. An external company needs to access the other server and is requesting an external IP for Server B (192.168.1.5) which need the same ports open along with 6200.What is the best way to set this up with what they have? The router is a Linksys WRT54G. Is there a way to set them up with a x.x.x.19 address from time warner? Is this something time warner will need to do?
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May 29, 2012
Client is having 1 file server running small business windows server 2003. Server is not configured with domain, it is working only on workgroup. We have around 15 users who are using that server as file server only. Now my main question is do i need to configure DNS server in that server?we also have internet connection running (have problem in that also, will explain next time) with wireless router to connected with switch. So do I need to setup dns in server also or just put static ip (I prefer static then dhcp) & dns server from ip will be ok? If I put dns which I got from ISP, so will it create any problem with using those file from server?the second question is..
What IP address, Default gateway and dns address I should use for Server & also client pc.
router ip - 192.168.1.1
server ip - 192.168.1.10
Currently no DNS setupcurrent configuration - Server
IP - 192.168.1.10
subnet- 255.255.255.0
gateway - 192.168.1.1
dns - 213.42.20.20 (from ISP)
dns2 - xxx.xx.xx.xx (from ISP)current configuration - Client
IP - 192168.1.111(to 115)
subnet - 255.255.255.0
gateway - 192.168.1.1
dns 1 - 192.168.1.10 (File Server)
dns 2 - 213.42.20.20 (from ISP)
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Mar 19, 2013
My setup is as follows: as a part of a global network, I have two separate measurement stations collecting data in the field. They are working with some kind of embedded linux system and is running an FTP-server so that I can download collected data. I have some control over the stations, which e.g. means that I can select the port used for the FTP-server (default is 21).Unfortunately, for this particular set of measurement stations, they are connecting via FTP-over-radio-link to another station which is connected to my computer via a router (on the server-side) and I can only "see" their common external IP address. If I have understood this correctly, they can not use the same port for FTP traffic, right? The router used is some (for me) unknown brand with unknown capabilities, so I don't expect/want a solution at that end.Now, to my problem: as a part of this global network there is a custom software running on my computer that automatically connects to all the different stations to download and process the data. This software runs on any recent version of Windows, but I'm running Windows XP right now. There is no way for me to modify this software at this point (for the future, maybe, but not now), and unfortunately it has a severe limitation: it MUST use port 21 for FTP-connections.My first attempt was to set the FTP-port to 2121 for one of the servers and create another IP address on my client network adapter and try to forward port 21 of this new IP to port 2121 on the server/router side, but due to lack of knowledge and experience I did not manage to get this working fully.
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Aug 6, 2012
I have one dedicated IP issued to my home, along with another dynamic one if I need it(but I don't use it). I have a webserver, mail server, and name server up and running on a single machine exposed to the internet with my static IP. I have a domain name registered to my IP address. My webserver and name server work great, but I am having difficulty with the mail server. In order to have mail work correctly, I have been told that I need to get reverse DNS setup for my domain (something I had neglected to do). My nameserver responds to reverse lookups correctly when issued locally, but it looks like queries from the internet never reach it (I think my ISP catches requests upstream). I contacted them and they put a PTR record in for my IP pointing to ns1.mydomain.com. This all works fine, but the thought occurred to me that if in my hosts file I put my MX record in as mail.mydomain.com., any mail clients that do a reverse lookup of my IP won't get mail.
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Mar 21, 2011
the way i find mac address remotely is by using this methodarp -a ip addressshould give you a mac address of the following ipsunil pindoria
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Aug 26, 2011
I actually have a query regarding ip addresses. We know that every domain name basically translates to set of 4 integers (in case of IPv4) which is basically the address of a website. But when we navigate to different pages of the same website, then do all of them have the same IP address?
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Dec 16, 2011
I am having some challenges on my DMZ network.My servers and Cisco Switches in the DMZ are picking the mac address of the Firewall(Cisco ASA).I have put some static arp entries on the Firewall and switches but the servers and users on the DMZ are still receiving the mac address of the Firewall.How can i stop the Firewall from changing the mac addresses of the devices on the network.My ASA is a 5520 and i have 2960Switches.
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Jun 19, 2012
Server 2008 has two Nics one connected to outside switch and has internet, other Nic is connected to local siwtches which has 20 systems connected locally but does not have internet. Local systems were getting IP from server, but there was not internet on the lan systems, I restarted the server and local systems lost IP address. earlier everyting was fine.
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Feb 7, 2012
We have a server connected to a 3560 switch which in turn connects to 6500s. The gateway interface is on the 6500. We will be changing the 6500s so the mac address for the gateway will change, however the IP address will remain the same. As we change out the 6500s the uplink connections to the 3560 will go down. This will flush the old mac address from the 3560.When the 3560 removes a MAC address does it update servers so they have to relearn the correct MAC address?
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Jan 23, 2012
I am working with MS Windows 2008 R2 and a Belkin F5D8635-4v1 router.
I have already set up a dynamic IP address which points to my router at home. In my home network I have multiple PC's that I would like to access from the internet. I would like to achieve this without needing to change my port forwarding rules on my router each time...
My thoughts are that I use a single dynamic IP address pointed to my router. My router then forwards to a server with some sort of software that can then forward to the correct PC based on the host name.
So I have 3 domains set up all pointing to the router's IP address:
dest1.domain.com -> 41.xxx.xxx.45
dest2.domain.com -> 41.xxx.xxx.45
dest3.domain.com -> 41.xxx.xxx.45
The router is not smart enough to redirect by host name, so it will just forward everything to 10.0.0.20 The server based at 10.0.0.20 must then have software to now redetermine the target based on the host name. The rules would be set up as follows:
dest1.domain.com -> 10.0.0.22
dest2.domain.com -> 10.0.0.24
dest3.domain.com -> 10.0.0.26
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Jun 11, 2013
We are planning to split the Private servers from the DMZ Servers and configure an additional Interface and segment for this purpose.
Private Servers Segment: 192.168.4.0/24 (there is no DHCP all servers' IPs are statically configured)
DMZ Segment: 192.168.3.0/24 (This is a future deployment)
LAN Segment: 172.17.0.0/16
Both, Private Servers and DMZ Servers are in a collocation as well as the ASA5520. There are multiple Branch offices that uses subnets within the 172.17.0.0/16 Network and they are connected to the ASA5520 via Metro-E.
I do not know if this is possible but what I want to do is this:
In order to avoid the change of internal DNS records I want to mask the DMZ servers with a Private Server IP when a Private server or LAN host wants to access it like this:
The FTP server in the DMZ has the IP address: 192.168.3.100. But when a PC from the LAN wants to reach the FTP server it should points to its old IP: 192.168.4.100. This way the PC sends a packet to the ftp.corporate.net (192.168.4.100) the ASA recieves the packet and translate it to the (192.168.3.100) and send it out through the DMZ Interface.
Also if the Private Servers wants to reach the same FTP the ASA will act like a proxy-ARP and send the paquet to the DMZ by means of the translation of the IP.
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Mar 20, 2012
I Have exented vlan 120,121 from DC-1 to DC-2,the DC-1 and DC-2 are connected using L2 Trunk over fiber terminated on Cisco 6513 on both site ,the distance around 40 Km ,on the DC-2 i just assigned server-1 TO VLAN 120 while server-2 in vlan 121 ,but these servers unable to communicate neither with DC-1 Servers or betwen them locally on DC-2 ,pls note that the servers at dc-2 rely on DC-1 for routing.
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Apr 16, 2011
i'm trying to connect 5 servers together to create a private network.Each server has a network of it's own and i'm trying to make all 5 servers communicate with each other to share and search data simultaneously..
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Mar 6, 2012
I am having an issue where occasionally the Sidewinder starts to see my internal RFC 1918 address instead of the configured external address of my firewall. This is for peering between the two. The error they see on the Sidewinder is:So instead of seeing the external peer address he sees a 10.220.3.18 address. We are not sure what triggers this becuase normally he see's my 63.117.98.222 address.
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Jul 8, 2012
I have an old ASA 5505, and I'm having some trouble with Nat Hairpinning. I've done this with other firewalls before and I am having no luck now. I have an internal address that I wish to forward from an external address- so if someone goes to 123.456.789.012:3456 then it will forward to 192.168.1.244:92 (All numbers are arbitrary here- only for illustration). I have and Access Rule and NAT and PAT set up so that I can get in if I originate from outside the LAN. What I am trying to do is to have this work from inside the LAN as well- so that if I am at my desk, and I connect a device and type in 123.456.789.012:3456, it will deliver the content at 192.168.1.244:92. The problem I am having is that it just isn't working, and I cannot figure out why- When I started here, there was an address configured to work this way, and it still works- I just cannot find what is different between what I am doing and what the person who configured it did.
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Oct 13, 2009
Is it possible using any module in CW to get the MAC address and IP address of all switchports on a 6500?
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Jul 16, 2011
I switched from Time Capsule with AirPort to E2000 and have a problem with configuration.I use the same IPs as in AirPort and E2000 gives me an error:"The WAN IP address cannot be the same subnet as the Guest Network IP address" and I can't save configuration.But in my opinion they are different.I use "Static IP" option and I have IPs from my ISP: [code] So WAN IP is different subnet as LAN and I don't know what to do now. It worked with these settings in AirPort and here I can't proceed.
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Feb 28, 2011
Is it possible to assign public IP address as Router's local IP address (RVL200, RVS4000)?
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Jul 3, 2011
I have a Linksys WRT54GS v5.1 router running firmware 1.52.5.I am trying to use Linksys IP Phones SPA942, but these do not seem to be able to log on and just show "Initializing network" even though the MAC address appears in the router with an IP address.The strange thing is that I already have 4 SPA941 phones that work with no problem and just log on to the network.Is there something about the SPA942 that I need to configure differently, I have factory reset it with sucess, but still unable to log on to the network.
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Apr 26, 2011
On my cisco IOS 12.4 router,Can i make it so only lets say mac address 11:22:33:44:55:66 able to use ip address 10.10.10.2?I want this so that only this IP can configure servers, and so if the computer using it is turned off, any other device cannot use the IP address.
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Mar 2, 2011
I recently configured and installed a 1941ISR for a customer. The customer purchased a 25-User SSLVPN license with the router, and I configured it for remote SSLVPN access. This is working nicely except for one issue: when users initiate an SSLVPN connection request by browsing to the assigned webvpn gateway IP, they get the "There is a problem with this website's security certificate" browser message. They are in the process of working with their DNS hosting provider to get a DNS entry assigned to the IP address so the users won't have to specify an IP address in the URL address box, but they will continue to get the certificate error until/unless I can figure out how to resolve the issue.
I've tried the following "How to make IE8 trust a self-signed certificate in 20 irritating steps" that I found via another forum link but with no luck:
1.Browse to the site whose certificate you want to trust.
2.When told "There is a problem with this website's security certificate.", choose "Continue to this website (not recommended)."
3.Select Tools->Internet Options.
4.Select Security->Trusted sites->Sites.
5.Confirm the URL matches, and click "Add" then "Close".
6.Close the "Internet Options" dialog box with either "OK" or "Cancel".
7.Refresh the current page.
8.When told "There is a problem with this website's security certificate.", choose "Continue to this website (not recommended)."
9.Click on "Certificate Error" at the right of the address bar and select "View certificates".
10.Click on "Install Certificate...", then in the wizard, click "Next".
11.On the next page select "Place all certificates in the following store".
12.Click "Browse", select "Trusted Root Certification Authorities", and click "OK".
13.Back in the wizard, click "Next", the "Finish".
14.If you get a "Security Warning" message box, click "Yes".
15.Dismiss the message box with "OK".
16.Select Tools->Internet Options.
17.Select Security->Trusted sites->Sites.
18.Select the URL you just added, click "Remove", then "Close".
19.Now shut down all running instances of IE, and start up IE again.
20.The site's certificate should now be trusted.
I followed all 20 irritating steps to the letter, but am still getting the security certificate nat.Now when I “Continue to this website (not recommended)” and click on "Certificate Error" at the right of the address bar, the certificate error windows says “Mismatched Address”.Is there a way that I can get this fixed without resorting to a 3rd party CA?
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Jun 3, 2012
I have been trying to clone my PC's MAC onto my Linksys WAG120N adsl2+ modem router .
I click the the clone my PC's MAC button in the MAC address clone tab. I get the following error :
"Mac address cannot be the multicast address"
The MAC address starts with 1C:C1:XX:XX:XX:XX
I even tried to update the firmware.
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Aug 23, 2009
I recently switched routers to the DIR-615 and I'm trying to troubleshoot why one of our laptops keeps losing the IP address and gets a self-assigned IP address. I see the following messages in the log, I am wondering if the reason codes are listed and explained somewhere? I tried searching the manual but could not find any information.
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Jun 1, 2012
We have an ADSL connection and use a D-Link DSL-320B modem. We have a D-Link DIR-120 router connected to this modem. This has worked perfectly fine up until today when we disconnected the router and connected a computer (call it A) directly to the modem because it was getting an unusable connection through the router for some reason. We later also performed a factory reset on the DIR-120 router.
Unfortunately, after the above steps the router did not receive any IP address (through DHCP) from the ADSL connection anymore. During my attempts to debug this I noticed that my laptop (call it B) didn't get any IP address either (when connected directly to the modem). I noticed the following syslog entries repeating over and over while trying to connect: [code]
At this point computer A could still get a connection just fine tho (when connected directly to the modem).
I then tried to change the MAC address of the router to an arbitrary one (a copy of computer B's MAC address but with the last digit increased by one). The router still did not get assigned any IP address. Finally I tried making the router clone the MAC address of a third computer (call it C). C has never been connected directly to the modem. Doing this worked. After cloning the MAC address of computer C the router is immediately assigned an IP address and the internet connection works as it did prior to all this.
Now, my question is, why would computer B and the original MAC address of the router not be able to get an IP address while two other computers worked just fine? Why would changing to an arbitrary MAC address not work while cloning the MAC address of another computer did? Could the router's MAC address have been blocked by the ISP for some reason (and what could cause this)?
but my situation seems more like a blacklisting of some MAC addresses rather then allowing just a single MAC address.
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Jan 12, 2012
I have a server subnet that for the most part needs to be able to access the internet for patches, updates, etc. My SysAd wants 2 of the servers to not have access. The server subnet is attached to a 3750 and connects to an ASA to reach the outside world. Would it be better to setup an ACL on the SVI of the server subnet or on the outbound direction of the outside interface on the ASA.
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Aug 22, 2012
Is the OVA available for download on Cisco's website compatible with anything outside VMWare? For example, Red Hat Virtualization for Servers.
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Apr 15, 2012
We have 2 servers currently and are adding one next month. All need to be accessible using a different web address. We have setup a records for the 2 existing servers but cannot get NAT to work properly. We have a block of 5 IP's from FIOS. x.x.x.146-150 and have tried using 146 and 150 as the main WAN static IP with no success in getting the other address to communicate to the corresponding server.
What we need...
Server @ address 192.168.2.2 - SBS Server, standard SBS ports - currently working via port forwarding with WAN static of .150
Server @ address 192.168.2.3 - RDP, HTTP, HTTPS, and others. Some ports are the same as SBS. Trying to NAT .149 to this server.
Server @ address 192.168.2.4 - RDP, HTTP, HTTPS, and others. Some ports are the same as SBS. Trying to NAT .148 to this server.
All servers are on VLAN 1 which has a static IP of 192.168.2.1. DHCP is controlled by SBS.
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