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Mac Forum / General / Networking / July 2009How To: Linksys DHCP assigns address based on MAC?
Greetings and thanks for reading this. With D-Link consumer routers, it is easy to have the DHCP server always assign the same LAN address to a given MAC number so port forwarding will go to the computer with that LAN address. I need to do this to a Linksys WRT54G router but can't find a recognizable page in the setup. Where to control the DHCP server? Kind regards  Signature--------------------------------- > Greetings and thanks for reading this. > With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 3 lines] > recognizable page in the setup. Where to control the DHCP server? > Kind regards Can't you tell the computer with that MAC address to use a fixed IP address? That's the way it works in Windows (and it's easy to do). SignatureGene E. Bloch letters0x40blochg0x2Ecom >> Greetings and thanks for reading this. >> With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 8 lines] > > That's the way it works in Windows (and it's easy to do). If he uses a fixed IP that's within the DHCP pool, the router might allocate that IP to something else. That would be bad. Most routers allow for IPs to be reserved for particular MAC addresses. The Linksys User Guide details how. Chapter 8, IIRC. Signatureemail to oshea dot j dot j at gmail dot com. > >> Greetings and thanks for reading this. > >> With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 13 lines] > be reserved for particular MAC addresses. The Linksys User Guide details how. > Chapter 8, IIRC. So he should use a fixed IP that's NOT within the DHCP pool. I have a WRT54G, and AFAIK it doesn't have a way to configure static MAC->IP mappings for the DHCP server. Maybe this can be added with DD-WRT firmware. SignatureBarry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group *** >>>> Greetings and thanks for reading this. >>>> With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 17 lines] > > So he should use a fixed IP that's NOT within the DHCP pool. Yes. IIRC Linksys routers usually set the DHCP pool to be from 192.168.1.10 on up to 192.168.1.254. The router itself is usually 192.168.1.1, and of course 192.168.1.0 and 192.168.1.255 can't be used, so that leaves 192.168.1.2 to 192.168.1.9 available for use. > I have a WRT54G, and AFAIK it doesn't have a way to configure static > MAC->IP mappings for the DHCP server. Maybe this can be added with > DD-WRT firmware. I could be wrong about this, but I'd be surprised if I were as that would make Linksys the only vendor which doesn't support reserved IPs, which is a standard TCP feature. Certainly the routers I have at home and at the office support reserved IPs. I use them all the time for printers, servers, NAS boxes, and laptops. Signatureemail to oshea dot j dot j at gmail dot com. > >>>> Greetings and thanks for reading this. > >>>> With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 23 lines] > course 192.168.1.0 and 192.168.1.255 can't be used, so that leaves > 192.168.1.2 to 192.168.1.9 available for use. It's been a while since I initially set mine up, so I could be remembering incorrectly, but I think the default range starts at .100, not .10. But even if not, it's simple to change the range it uses, if you need more fixed addresses. The problem with configuring a static IP, though, is that you also have to configure DNS statically. It would be preferable to get the ISP's DNS from the router via DHCP. Apple has an option in the Network preference for "Using DHCP with manual address", but this doesn't seem to work with Linksys routers. We had a thread a couple of years ago about this. > > I have a WRT54G, and AFAIK it doesn't have a way to configure static > > MAC->IP mappings for the DHCP server. Maybe this can be added with [quoted text clipped - 5 lines] > support reserved IPs. I use them all the time for printers, servers, NAS > boxes, and laptops. I'm practically certain I'm correct. This isn't a "standard TCP feature", it's a configuration option in some (perhaps most) DHCP servers. It doesn't affect the wire protocol, so it's not something that needs to be standardized across implementations. SignatureBarry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group *** >>>>>> Greetings and thanks for reading this. >>>>>> With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 28 lines] > not .10. But even if not, it's simple to change the range it uses, if > you need more fixed addresses. You could easily be right, it's been a long time since I played with a Linksys. > The problem with configuring a static IP, though, is that you also have > to configure DNS statically. It would be preferable to get the ISP's > DNS from the router via DHCP. Apple has an option in the Network > preference for "Using DHCP with manual address", but this doesn't seem > to work with Linksys routers. We had a thread a couple of years ago > about this. I always put in a DNS server anyway. Usually OpenDNS. >>> I have a WRT54G, and AFAIK it doesn't have a way to configure static >>> MAC->IP mappings for the DHCP server. Maybe this can be added with [quoted text clipped - 11 lines] > servers. It doesn't affect the wire protocol, so it's not something > that needs to be standardized across implementations. I stand corrected. Signatureemail to oshea dot j dot j at gmail dot com. > Greetings and thanks for reading this. > With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 3 lines] > recognizable page in the setup. Where to control the DHCP server? > Kind regards Linksys router, NAT, and firewall solutions are pathetic. No features, no throughput, and very prone to crashing. I don't think you'll find a better solution than ditching it. As a temporary solution, you can give the computers static IP addresses inside the subnet but outside the DHCP range. The Linksys probably only handles 25 DHCP addresses so plenty are left for manual assignment even in a /24 subnet. SignatureI will not see your reply if you use Google. >> Greetings and thanks for reading this. >> With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 12 lines] > handles 25 DHCP addresses so plenty are left for manual assignment even > in a /24 subnet. I didn't think that Linksys was _that_ bad. Not fully baked, yes, but missing key features? Maybe I'm spoiled by using real routers... Signatureemail to oshea dot j dot j at gmail dot com. On 2009.07.04 07:34:25, the amazing <kevinmcm@sonic.net> declared: <snip!> > Linksys router, NAT, and firewall solutions are pathetic. No features, > no throughput, and very prone to crashing. I don't think you'll find a > better solution than ditching it. I've been using a Linksys BEFSR for quite a while, and it seems to do the job OK. On the BEFSR you specify what IP range you let the DHCP server control. I only let it control a small number, so guests can plug into the net. Our two Apples, and our backup drive, claim their own IPs. But obviously my notion that the Linksys does everything I expect a router to do doesn't have much grounding, since the only router I've ever had is a Linksys :-) Eventually I'll have to replace it. Is there consensus about which brands are good? Maybe I should ask whether there's a web site that has ratings.... > As a temporary solution, you can give the computers static IP addresses > inside the subnet but outside the DHCP range. The Linksys probably only > handles 25 DHCP addresses so plenty are left for manual assignment even > in a /24 subnet. SignatureNollaig MacKenzie http://www.amhuinnsuidhe.net > On 2009.07.04 07:34:25, > the amazing <kevinmcm@sonic.net> declared: [quoted text clipped - 17 lines] > brands are good? Maybe I should ask whether there's a web > site that has ratings.... The best consumer router is Apple's Airport Extreme. It does everything: DHCP, NAT, easily sets DHCP pools, easily reserves IPs, can create multiple networks if necessary, knows both IPv4 and IPv6, knows many varieties of WPA (and WEP, which is useless...) and does _NOT_ use a HTML page for configuration, and so is hard to hack remotely. It also doesn't use stupid passwords as defaults. The best business routers depend on what you want to do and what your budget is. Low-end business routers start at $1000. Good ones cost more. Signatureemail to oshea dot j dot j at gmail dot com. > The best consumer router is Apple's Airport Extreme. It does everything: > DHCP, NAT, easily sets DHCP pools, easily reserves IPs, can create multiple > networks if necessary, knows both IPv4 and IPv6, knows many varieties of WPA > (and WEP, which is useless...) and does _NOT_ use a HTML page for > configuration, and so is hard to hack remotely. It also doesn't use stupid > passwords as defaults. My DGL 4300 does all that, and yeah, it has an HTML setup page, I wouldn't have it any other way; it's very secure if it's used correctly. Passwords are the responsibility of the user, not the vendor. If the user is too stupid to change the default, then he's probably too stupid to tie his shoe laces as well. And the Airport is anything but "Extreme," at least as a receiver. The only laptops that don't pick up the signal at the back of the house are Apple laptops. SignatureSuddenly he realized that he was alone with a giant halfwit on a dark deserted street. -- Chester Himes > The best consumer router is Apple's Airport Extreme. ... > and does _NOT_ use a HTML page for configuration There's something I really *hate* about the Airport, namely that I need a special app to cofigure it. Greetings and many thanks for your comments from which, I take it that the Linksys WRT54G is not capable of having its DHCP server reserve IPs for given MAC addresses. Kind regards Signature--------------------------------- > Greetings and many thanks for your comments from which, I take it that > the Linksys WRT54G is not capable of having its DHCP server reserve IPs > for given MAC addresses. it very definitely is if you use third party firmware. > > On 2009.07.04 07:34:25, > > the amazing <kevinmcm@sonic.net> declared: [quoted text clipped - 27 lines] > The best business routers depend on what you want to do and what your budget > is. Low-end business routers start at $1000. Good ones cost more. Netgear small-business routers (metal blue ones) are pretty good for the price as long as you don't update the firmware. SignatureI will not see your reply if you use Google. > Greetings and thanks for reading this. > With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 3 lines] > recognizable page in the setup. Where to control the DHCP server? > Kind regards In the primary page (Setup - Basic setup): DHCP Server Setting There is a choice to enable/disable the DHCP server. Next to it is a DHCP Reservation button. Click it, and a window opens where you can manually enter new clients and assign addresses based onb their MAC address. At least, on my WRT-150N. Hope this helps. --maarten > > Greetings and thanks for reading this. > > With D-Link consumer routers, it is easy to have the DHCP server always [quoted text clipped - 13 lines] > > At least, on my WRT-150N. WRT-150N is not the same as WRT54G. The latter doesn't have that button. SignatureBarry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group *** |
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