Protocols / Routing :: Cisco 1841 - Cannot Use Public IP Address
Jun 5, 2012
Am having an issue with my cisco 1841. I recently brought some IP Publics. Now that i need them i just can't use them, I don't know much about routers but till now have successfully manage to do some stuffs with the router after googling ,OK we already have some other ip publics and when i look at the config file i can see something like this:
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Mar 8, 2012
I'm really bad on networking so I have a question about NAT. I got two public IP addresses from my ISP: 92.x.x.252 - 92.x.x.254. 92.x.x.254 is configured as secondary on external interface and clients will use it two connect (vpn) it from outside through cisco 1841 to zywall p1 with wan ip address 92.x.x.253. Is this configuration (look at picture) allowed? How can I route traffic from 92.x.x.254 to zywall p1, if posible?
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Aug 24, 2011
I'm trying to connect an Xbox 360 to my University's wireless network using a bridged connection between the wireless adapter and the LAN adapter. I can connect to the internet on the Xbox, but not Xbox LIVE. I get an error message stating that my MTU setting must be 1364 or higher. I obviously cannot access the router settings because they are the schools routers and I do not have administrative privileges. So, Is there some other way to modify MTU settings without that access?
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Jul 26, 2011
I have set up several types of servers on my computer (ftp, game servers, web servers, etc).
I have had a problem with people connecting to any of my servers. I know for a fact I have port forwarded correctly (I have checked 12 times, and I have never had a problem port forwarding). I know it's not my firewall, the problem persists when I completely shut it down.
I had an ftp and web server working about a week ago. No one can connect to any server, be it ftp...web...etc.
My router is a Netgear WNR2000v2
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Jan 6, 2012
I am trying come up with a setup that allows for a computer to simultaneously be connected to the web via a secure wireless network and to provide a shared drive via an unsecured (possibly ad hoc) wireless network.Which is to say, the computer needs to be able to use the web wirelessly via the secure network, and people need to be able to share files with it wirelessly whether or not THEY can use the secure wifi.One last requirement is that I need a this to be something that I can set up in a given location with no more configuration than required to connect to the secured wifi - if the setup requires me to mess around with the configuration of the router for the secure network itself, it won't work.
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Oct 9, 2012
This is existing network diagram and find attached file for configuration of Router and L3 Switch:ISP provided 6 Mbps internet access link with ethernet Handoff which is terminated over Cisco 1841.ISP also provided pool of 30 Public ip's 125.63.74.33 /27 , range from 125.63.74.34 to 125.63.74.62.In my current setup, all Inside to ouside traffic going out through 125.63.74.34 public ip because this public-ip NAT overload with Router F0/1 interface.
1) I want to divide 6 Mbps link physically into three parts 2Mbps, 2Mbps, 2Mbps for three VLANs.
2) I want to also configure each vlan IN/OUT traffic with different Public ip. is it possible or not ?
Vlan2 = 172.25.162.0 /24 => Inside to outside / Outside to inside traffic through 125.63.74.40
Vlan3 = 172.25.163.0 /24 => Inside to outside / Outside to inside traffic through 125.63.74.41
Vlan4 = 172.25 164.0 /24 => Inside to outside / Outside to inside traffic through 125.63.74.42
How can i configure above desired setup with CBWFQ
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Jun 9, 2011
I have a dell laptop. It will pick up and connect to the neighbors wifi. But when trying to connect to mine it will not acquire a network address. It continuously searches but says 0.0.0... it says the signal is excellent but will just not acquire the ip address. By the way, cell phones with Wifi connect to this network with no problems.
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Sep 17, 2011
So I want to watch some videos on justin.tv, but for some reason I have been IP blocked. I actually went on their support forums and the guy basically said "I picked up a bad IP address", so I didn't do anything wrong, I just got unlucky.
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Feb 16, 2012
Keep a log of my own (Wan) IP-adress. It should look up my own IP-address and write it away to a log, so that I can look up a few weeks or months later what my IP-adress was on a certain day. I am using a router at home.
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Sep 18, 2011
Have tried 192.168.0.1 and 192.168.1.1 and both time out.I need to connect two laptops to the wireless and need the pass code.
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Mar 21, 2011
I'm working on a CCTV DVR which has network viewing function. The front controls on the DVR won't work at all so i am unable to access any menus or burn off the footage i need. I was hoping to connect to the unit via the network viewer software or web browser but i have no idea what the ip address is. Is there any way of finding out the ip address of the unit if i connect a pc to it via a cross over cable or through a switch or am i stuck because i dont know the ip range it is in?
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Apr 27, 2012
How can know the Broadcast address before subnetting? I know how to calculate the broadcast address , but don't understand 'Broadcast address before subnetting'?
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Apr 12, 2012
Is there any way to get an ip address through it's physical location? I was asked this by a friend and it's a good question. We know how to get the physical address by it's by coordinates, but is it possible to reverse it, getting the ip assigned to the physical address?
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Mar 30, 2011
How can I change my external IP address which is assigned
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Nov 21, 2012
i got a d-link router comming off modum and then a lynksys switch . well when i run the lorex program it (the switch) shows up as a router with a ip address ? i have tried a different swith but still the same thing happens .
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Jul 15, 2012
well i had the same problem because i got bored and i was like hmm i wonder if i can change my IP and i tried it and i had the same problem but when i did system restore it still did not work, now i have to get a new operateing system...
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Nov 15, 2011
Okay so currently in my possession is a SR 5500 wireless channel receiver with a problem.. We need to find its current ip address it also is not a standard ip address such as 192.168.xxx.xxx it has a standard ethernet port and of course GPIB ports
I'm looking to know if there is a way I can find its ip address by maybe with a crossover cable, or by bridging its connection to my computer and somehow seeing what ip it's requesting.
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Nov 8, 2012
I have a list of email addresses, people who have subscribed to a free electronic newsletter. The email address is all the information we have about each subscriber.A satellite office is going to begin handling print and electronic subscriptions for subscribers in Peru. Is there any way to determine which of these email addresses are from Peru?
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Apr 5, 2013
giving unauthorized access and no internet access
Windows IP Configuration
Host Name . . . . . . . . . . . . : KHANBALOCH-PC
Primary Dns Suffix . . . . . . . :
[Code].....
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Jun 11, 2011
How i can change my ip address without changing my internet connection??
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Dec 19, 2011
I have an ASA 5505 configured with internal network, a DMZ, and a VPN on seperate subnets. The implicit rules allow my internal client computers to connect to the web servers on the DMZ IP, but I can not connect to the public NAT address from the internal network. I have a DNS server on my internal network and it does resolve to the public IP correctly. NAT seems to be working correctly because if I go outside the network and connect to the public IP or qualified name then I can get to everything correctly. I do not see any messages in the Cisco logs and the packet trace tool shows the route of http from an internal IP adddress to the external (NATed) address is allowed.
Specifically, I can go to http://192.168.1.121 from the internal (192.168.0/24) network, but I can not go to http://72.22.214.121 (the NAT address) from the internal network. If I am outside my cisco then I can go to http://72.22.214.121 easily. [code]
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Jan 22, 2012
I have a 1841 deployed as my NAT device towards internet. NAT is setup so that internal addresses can access WWW. I also have some NAT translations opening speciic ports from outside to inside in the form: ip nat inside source static tcp A.B.C.D 443 A.B.C.D 443 extendable.
Now have an outside address/port setup with a public DNS reference and using NAT from outside to get access to the corresponding inside address. It works when being outside the LAN.
Now to the problem: From the LAN side of the router - i cannot access the public name. I can ping it - but my browser dont find the webserver behind the name. Someone told me it should be setup as "local firewall domain" - and i should set this up as "source NAT".
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Dec 5, 2012
I have not yet completed my CCNA, however I have managed to configure a 1841 router with 1 x HWIC-ADSL1 and it also has 1 x HWIC-AG-AP-A which is the only part I am unable to get working.
The Wi-Fi (Dot11Radio) config has enabled me to see the SSID from wireless devices, but they never get an IP address. I need them to get the same IP range as the DHCP service I have in there 203.35.10.xxx, there is no option for "IP ADDRESS DHCP" only "IP ADDRESS POOL LAN" Lan is of course my DHCP pool name. however I cannot have the same DHCP pool on both Dot11Radio interfaces.
I know I'm missing one very simple command, but as I've never worked with Radio on Cisco equipment, I am unsure how to fix it.
Then once I get that worked out, I need changing the access from OPEN to WPA or WPA2, etc..
IOS Software on Router is C1841-ADVSECURITYK9-M - Version 12.4(9) T
I can upgrade to a better version of software if needed, I only have a 32mb Flash and 128Mb Ram.
The current Radio Config is:
!
interface Dot11Radio0/1/0
no ip address
no ip redirects
[Code]....
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Sep 28, 2011
partition the departmental IP network address block to create a staff and a student subnet. Each of these will be identified by its own network address and netmask. It is university policy that you must be economical with the IP addresses. That is, the subnets must be as small as possible, but they must be large enough to accommodate the maximum number of hosts you were given. Also, it is university policy that the respective gateway router to the outside world should always be given the highest possible host IP address in the subnet. The student subnet should have a higher IP network address than the staff subnet. The network must be able to support up to 60 machines on the staff subnet (not counting the router) and up to 120 machines on the student subnet (also not counting the router).
IP address/netmask
University network address127.158.128.0
University network mask255.255.192.0
University internet gateway IP address127.158.191.254
Department network mask255.255.254.0
Department router address127.158.129.254
Suppose that the network address of the departmental network is 127.158.128.0 (calculated by AND between Dep network mask and Dep router address)I know that 60 machines would use 6 bits for the staff subnet.the netmask of staff would be 255.255.255.192.how can I figure out the the IP network address of the staff subnet.I have worked out the range for the staff subnetwork.
127.158.128.0 - 127.158.128.63
127.158.128.1 = Gateway address
127.158.128.63 = Broadcast address
Now how can I calculate the IP network address of the staff subnet?
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Nov 9, 2012
I got 1 public IP for router and 16 Public IP's for NAT from ISP. Both router IP in one range and the NAT IP's are in different range. I want to use 1 NAT public IP for one of my windows server.Am using cisco 1841 router, in which I ve configured the public IP provided by the ISP for router.
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Sep 4, 2012
I am using cisco 1841 LAN router, I need to block MAC address i have applied the command access-list 1102 deny 0000.0000.0000.0000 mac address..... but it does not work.
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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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Apr 21, 2013
I am trying to figure out how this works. I have an ISP device that connects to my 1841. ISP and fa0/0 hold the /30 WAN addresses. Fa0/1 hold one of the public IPs, lets say 1.1.1.1/29. Then the outside interface of the ASA holds 1.1.1.2/29. Now I have two routes in the 1841, one for default route going back to the ISP device, and a route for the 1.1.1.0/29 network going to the ASA.Now I have 4 more publics I can use 1.1.1.3 - 6. I do not want to assign these IPs to the servers, but yet just NAT them. I know this is possible, but cant figureI took an internal host and did a one to one static NAT from private to public. Packet tracer says my NAT rules are ok. Allowed all IP traffic for testing and still can't ping the server.
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Jun 16, 2011
I've got an existing Cisco 1841 connecting to a 10Mbps Internet Leased line. With my current setup I've configured PAT for internet access for my users, and we also have some servers on site which are assigned public ip addresses, these can be accessed from the internet. Now we have procured a Cisco 1921 ISR to replace the old 1841, when I connect the 1921 with an identical configuration in place of the old router, 2 things happen.
1) The users accessing the net via the nat are able to work without any inconvenience (good)
2) My servers which have public IP addresses are unable to reach the internet and subsequently I am unable to reach them via the internet (very bad)
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Dec 11, 2012
i am using a Cisco 1841 with subinterfaces instead (NAT on a stick).From the internet i can access services on public IP being hosted in LAN2. But when i try to access the same services on the same public IPs but sitting on LAN1, it does not work.
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Dec 11, 2012
i am using a Cisco 1841 with subinterfaces instead (NAT on a stick).From the internet i can access services on public IP being hosted in LAN2. But when i try to access the same services on the same public IPs but sitting on LAN1, it does not work.
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May 13, 2011
1. how do I nat a public address to a dmz address.
2. how do I open port 80/443 in the public to this address?
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Sep 7, 2011
I have a ASA5505 that I need to allow IPSEC and SSL VPNs through. The ASA is connecting to a BT Business ADSL router, what address should I be using on the ASA outside interface that will allow the ASA to be reachable from the Internet?
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