DSL Modem Make is: HUAWEI SmartAX MT880

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its Modem with NAT service and router. So other user can access the Internet. There is a option to disable NAT.

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Disabling NAT is tantamount to sending open invitation to the world to come into your network and do whatever they please (i.ie. - steal your ID and who you are and even send threatening e-mail (along with your IP & MAC addresses) to the President. You will wonder why all the Secret Services & FBI came to storm down your house within the hour). i_Xp/VistaUser

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http://www.huawei.com/products/term...

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If you disable NAT other users on your network wont be able to connect to the Internet. Thats what NAT is for, to allow multiple user on the same LAN to use the same public IP address. The security aspects mentioned by XPUser are just incidental but are a good thing to have. Stuart

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i know that disabling NAT will affect my security, and other user will not able to use internet. But i want it because want to connect it to Linksys VPN model RV042

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i want it because want to connect it to Linksys VPN model RV042 Why didn't you mention this in the very beginning of your thread - our responses would have been completely different. i_Xp/VistaUser

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sorry for that

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another modem i have is: Brand:UTSTARCOM Mode: UT-300R2U

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OK...just to clarify... 1. Depending on the ISP and what brand of modems they use they may or may not NAT... Example, Charter cable uses a modem that transfers the public IP directly to your comptuer...it does not NAT... ATT uses the Speedstream 4100 for modems only and a 2Wire modem/router...which they like to sell if you tell them you want wireless... 2. Having a public exposed directly to your comptuer is not the best thing to do...it makes it easier for viruses, spyware etc to get on your box...easier to hack...etc... 3. If you run a public IP to your computer then you MUST have a good antivirus, a good antispyware programs and a firewall...without any of these you will get hit, maybe not today or tomorrow, but plan within a fairly short period of time you will get hit... 3. Some ISP's that supply dynamic IP addresses will change them every 24 hours or so...some will change them every few days...others may change every couple of weeks or so, but this is not very common...it all depends on what their policy is... 4. Most routers will bridge the public IP thru the router, called Bridge mode...not every router will...it is usually referred to as the DMZ...if you put your computer in the DMZ, then it IS using the public IP...Some routers will have an extra port labled DMZ...plug your computer into this port and you are using the public IP... 5. In my case, I have ATT dsl...I have 5 static IP addresses...yes I pay additional for this...ATT supplied me with a 2Wire router as it will handle all 5 IP addresses... I bridge one IP thru the router and that public IP then goes into my 2ed router, a Linksys RV042...that router then NAT's to my home network... I take another IP that I route thru the 2Wire to a NIC in my webserver...all traffic on port 80 comes to that webserver...I host my own website on it...I have that machine VERY hard... In case you're interested I use Zone Alarm Pro, it is a good firewall but it has some "faults"...I use Kaspersky antivirus which I think just might be the best antivirus available...and I use Webroot Spysweeper... So...that's my thoughts...

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stevem5000 Thanks for in detail explaination. If I use bridge mode, is it necessary to have support from broadband company? Because when I select bridge mode in my modem settings, it wipe out username and password field.so I don't know how it would login to broadband company. One more question is, can I use DMZ and forward it to my linksys RV042 so that RV042 can get real ip? Pls help on this.

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I think...and I am not real certain here... Some ISP do not want you to run a web server, ftp site etc on the broadband connection they provide...this will depend on who your ISP is...in my case ATT does allow it which is why they have a system to provide 5 static IP addresses... I think part of the answer is the type of modem you are using...If your DSL modem NAT's, like the Speedstream 4100 that ATT uses in most areas, you can log into the modem and see how it is set up...This modem will hold your log in information that most DSL suppliers require as they use PPPoE...which is a username/password sytem... So, if your DSL modem NAT's then the modem is used to establish and maintain your DSL connection... Now...whatever IP that comes OUT of the DSL modem, it will be a private IP...like 192.168.0.xxx can go directly into your RV042...and from there to your LAN...this would be a "normal" use of a DSL modem and a router...also note, you now have 2 "NAT's"...your modem NATed from your public IP to a private and your router NATed from the incoming private IP to another private IP...In the RV042, as well as with most routers, you can choose the private IP range you want to have on your LAN...I think most people leave it as the default, 192.168.x.x...but you could choose the 172 or 10.0 range... Now...if your DSL modem does NOT NAT...whatever the public IP address that is coming INTO the DSL modem, will be going OUT of the DSL modem and into your RV042... NOW, your RV042 has a port on the back of it labled DMZ...at THAT port this is your PUBLIC IP address...it is NOT NATed...so If you plug a comptuer into the DMZ it will have the public IP...and computers you plug into any of the 4 ports labled LAN WILL BE NATed to a private IP range... OK...how do we get a Public IP past a DSL modem that NAT's??? Purchase a little Netgear 4 port HUB....NOT A SWITCH...GET A HUB...about $25.00... Why... A hub has ALL IP traffic and sends it out to ALL ports...it is not port specific like a switch is...so this means you put a public IP into a hub and you have a public IP coming out of all 4 ports...One port goes to a router to NAT for your LAN and now you have 3 ports available to the Public IP... Now, here is the catch to this idea...btw this works on static IP like a T1 line but it should work in dymamic IP's... Log into your dsl modem, you should find a way to pass your public IP thru WITHOUT your dsl modem NATing...I don;t know if this feature is available in all DSL modems... If your DSL modes does NOT nat, than it is not an issue...if your DSL modem DOES NAT then you have to figgure a way to get the public IP thru the modem... Now, if you are going to build a webserver, ftp site etc...and you have a dynamic IP, you have to get around the DNS issue with a DNS forwarding service...cost about $35 a year or so...This service will monitor your dynamic IP and whenever it changes it will update the DNS servers so folks on the Inet can find your website... Google for DNS forwarders...there are a bunch of them... Hope this helps... Regards Steve

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I set my modem as a passthrough device. It has a web based setup to allow it to be a device that converts phone to ethernet only. Then I set the router to act as the connection manager. Connect the router wan port to the modem. -- Most soho routers have a way to put ppoe or other means to connect. Some have a smart connect feature too. Connect when needed. Let the router offer dhcp and connect all your systems to the lan side of the router. All assumes you can if allowed with the isp. I read it wrong and answer it wrong too. So get off my case you peanut.

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