Question about D-Link DIR-600 Router

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Iam having different ips from wan is this mean someone is accessing my network?

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You just have Dynamic ip, nothing to worry about.

"Static IP addressing is for one customer on one IP address and Dynamic IP addressing assigns a different IP address each time the ISP customer logs on to their computer, but this is dependent upon the Internet Service Provider (ISP) because some ISP's only change the IP address as they deem it necessary.

If you have Dynamic IP Addressing through your Website Host it means that you are sharing an IP Address with several other customers.

If you are a beginner on the internet, an avid internet user, are entertaining the thought of starting your own website business, are a gamer, use VOIP or VPN there are several things you should know about IP Addressing."


Read more

Posted on Mar 21, 2011

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I take your question as this: You are noticing that your IP address of your router is changing and are concerned that it means other people are getting on it.
The WAN port can change IPs based on disconnects from your internet service provider and unless you pay for or have an agreement to get the same IP from your ISP everytime, this is very normal and does not, by itself, indicate that someone else is accessing your internal network.
However, if it's your internal IP address changing it could be an indication that someone else could be connecting to your wireless connection. The way to prevent this is to ensure that you have WPA (or WPA2) security enabled on your wireless router. You can refer to the manual (http://files.dlink.com.au/Products/DIR-600/Manuals/DIR-600_B1_Manual_v2.01.pdf) on how to enable this security.
Hope this helps!

Posted on Mar 21, 2011

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First of all check the DSL cable must be in WAN port of the linksys router. if it is done then do the following.

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What this does is tell the router that when ever a request comes in on port 21, it should forward it to 192.168.0.102. To access the external side of the router you need to go to 70.55.84.233 (according to the image you posted)

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You need to configure NAT on the router to permit the entire LAN to access internet

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The Lan limit on unshielded twisted pair cable (UTP) is 300 ft for a local area network (lan). The cable uses the 802.3 Of course if fiber is used in a LAN then this # can be extended substantially.

Now the main difference between the LAN and Wide Area Network (WAN) is that LANs typically have 1 brodacast domain and froward packets at data link (layer 2 of the OSI) level using MAC addresses.

The WAN operates at the network level (layer 3 of the OSI). WANs are and reads IP addresses. Routers can extend far distances (as you said 40-60km) and band with depends on distance. the further away, the more attenuation on the line.

I hope this helps.

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1 Answer

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Just a bit of explanation. E0 interface is for inside network (LAN interface). E1 is for outside (ISP or WAN physical interface). Dialer1 is for PPPoE (the "actual"/logical WAN interface). The 1.0.0.13 is ISP provided static IP address for the use of the server. This configuration example is for running FTP server, which uses the standard TCP port 20 and 21.

The LAN uses 10.10.10.0 network with 255.255.255.0 subnet for both servers and workstations. All servers within the LAN use static IP address. The router is configured as DHCP server to give out IP info (IP addresses, subnet mask, DNS) to workstations that are configured as DHCP client.

Basically I suggest that you deploy NAT (Network Address Translation) and PAT (Port Address Translation) to setup your own servers behind Cisco router. The NAT is used to translate the ISP's given static IP address to your local IP address. The PAT is used to translate TCP ports (the port 20 and 21) between the two IP addresses.

When using NAT/PAT, keep in mind that the Internet-accessible servers are seen from the Internet as their NAT/PAT-ed IP address (the Public IP address) and not the local IP address (not the Private IP address). This understanding is very important when you or someone need to test connectivity to the server and/or when you need to create filter (access list or ACL for short) to allow only certain incoming traffic from the Internet and block others.

Side Note:
For more info on NAT/PAT concept, check out the following FAQ
»Cisco Forum FAQ »NAT and PAT; Introduction and Implementations

Instruments used in this illustration are pretty much standard for running your own servers. Please note that IP addresses, username, and password are changed. However, you could always modify the configuration to suit your situation.

This sample configuration assumes that you have a block of IP from ISP. There is a dedicated Public IP address for the router WAN interface (the Dialer1 interface) and another dedicated Public IP address for the server PAT IP address. If you only have a single Public IP address for both router WAN interface and server PAT IP address, there are several ways to configure the router.

One way is to use the same command as shown in sample configuration.

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  1. ip nat source static tcp 10.10.10.2 21 1.1.1.14 21 extendable
ip nat source static tcp 10.10.10.2 21 1.1.1.14 21 extendable
This one configuration way is suitable when you have static IP address from your ISP and you know exactly what the IP address is. In this case you have the 1.1.1.14 single static IP address for both the WAN interface and Public server IP address.

When you are unsure which IP address you receive from the ISP, or when your Public IP address keep changing; then another way to configure the static PAT is following

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  1. ip nat source static tcp 10.10.10.2 21 interface Dialer1 21 extendable
ip nat source static tcp 10.10.10.2 21 interface Dialer1 21 extendable
With situation of dynamic IP address, at some point you still need to know the exact Public IP address you receive from your ISP for server connection testing and production time. To find out, you can issue show ip interface brief command on the router. You will then see the associated WAN interface Public IP address.

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