NAPT?

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DataCenter
DHCP
DNS
Networking services
What is Network Address Port Translation? Also, how can I make a log file on my extremely small WLAN showing the MAC and IP of the users and when they logged on and off? Also, I'd like to setup a small DNS server for said network on a small partition on my computer. How would I go about doing that?

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Network address port translation is when a router recieves a request for something eg. a webpage, the router looks at the rquest and sees what address (private) to send requests on that port, in this case 80 to. it is a way to translate public addresses to private addresses without having to buy more IPs

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  • Santoscardenas
    As "dimpoitc" put it, in laymans terms, your router is the key. Your router will take an assigned IP from your ISP and utilize it to send information packs with this IP. Meanwhile on the backend(your side of the network) each of your machines is assigned a private IP by the router utilizing either DHCP or static IP's. When one of your machines sends a request outside of the network ie..internet, the router utilizes NAT to send that specific machines IP, masks it with its own assigned IP, sends the request out. When the response comes back, the router remebers which internal IP sent the request and relays the information to that said IP. As far as setting up a DNS server, forget it. You have all the tools available to you through your WLAN router. Your router should have the ability to log any and all transactions that you would need to log.
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  • Larrythethird
    You can have two different types of NAT. There's one to many and one to one NATing. If you have a range of IP addresses from an ISP, you can use one to one NATing to isolate your users from the internet for security. Many to one is when your ISP gives you a limited number of addresses but you have many users that you want to allow on to the internet. In essence, they are sharing one address. As far as logging MAC addresses and IP addresses, you would need to use SNMP to querry the WLAN device for the information, provided that the device supports SNMP. As to DNS, I agree that you should not need it locally. Your ISP will provide DNS with the IP address it gives you, if it's a DHCP assignment. If not, they would have to tell you where their DNS is.
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  • Apollyon
    Could you show me exactly how to set up SNMP, 'cause I think my router supports it. Also, the reason why I want a local DNS is to speed up browsing. Also, what's port address translation?
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  • Dclacy
    What type of Router do you have? If Cisco Router, from CLI you can simply setup using something like the following (Don't forget community string else SNMP won't work) snmp-server engineID local 0000000000000000000000001 snmp-server community public RO snmp-server contact Your Network Guru! snmp-server chassis-id 00000001 snmp-server enable traps snmp authentication warmstart linkdown linkup coldstart snmp-server enable traps config snmp-server enable traps entity snmp-server enable traps fru-ctrl snmp-server enable traps flash insertion removal snmp-server enable traps bridge snmp-server enable traps stpx snmp-server enable traps rtr snmp-server enable traps port-security snmp-server enable traps vtp snmp-server enable traps vlancreate snmp-server enable traps vlandelete snmp-server enable traps MAC-Notification snmp-server enable traps envmon fan shutdown supply temperature snmp-server enable traps hsrp snmp-server enable traps cluster snmp-server enable traps copy-config snmp-server enable traps syslog snmp-server enable traps vlan-membership snmp-server host 192.168.1.1 syslog Note that 192.168.1.1 is example of your syslog server, Engine and Chasis Id's would most likely not be 1, and you don't have to trap everything... you could be more selective.... but these are just examples. Having a local DNS server will not speed up browsing, is just used in IP to name resolution... best leave DNS with your ISP as it is easily broken....which will greatly affect your browsing performance by stopping it until DNS repaired.
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