| reply to No_Strings
Re: Locking IP address in Router for printer Well right now the router DHCP server is set to the default range of issuing address in the .2 to .254 range.
And I am going to have to change one end of the other to give at least one address that the router willl not assign and put the printer on that.
I guess I could put the printer at the high end expecting that the router will never get that high, but if I did some fluke it would try to assign address that high and have a conflict.
But I have noticed some strange things on the router. One of the status displays list the DHCP address and devices it has assigned.
But often it will not show all of then, although the devices are communicating OK.
My speculation is that the device already have an IP assinged to them when the router is rebooted they talk fine with that IP and don't have to ask the DHCP server for one until either the lease expires or the device is rebooted.
And at first I was thinking that the router might send out a broadcast asking who was their already or sending out a "every one shut up and ask for a new address". But that is not a guarantee either. If a device is powered up, but in a sleep mode it won't respond, but will keep it's last IP.
So I am guessing the router has some mechanism to where if it starts seening the same IP on 2 ports that it tells both of them to shut and ask for a new IP.
Although I suspect that the router has to keep a table of what IP traffic is on each port so that it knows how to route the traffic even if it did not assign the IP. And that the DHCP server is a separate function and the status only shows what the server did and not the internal tables.
Tomorrow I am going to run some 'spriment' with rebooting the router both with the other device in standby or disconnected and with the off and reboot after the router reboots and then just connecting with the laptop and seeing what it the router assigns.
BTW, the router has to have some limits on the number of ports that it can that it can route. Of course it only has 4 hardwired ports, but it can have any number of wireless connections at any one time.
While it could be setup to support the full range of .2 to .254 that seems like a lot. And I am not about the basic home level cheapest routers. I am if you have any idea of how many different connection that they will support at any one time.
Not that I really need to know, but just interested.
Thanks for the help that you have given me already. |
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| The theoretical limit is 255, based on available addresses. The practical limit varies. If you have a slow connection and heavy downloaders, they'll be hating life it there are only a couple. Light browsing and email - 20 would play together nicely on a fast pipe.
Good luck with it. |
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| I found a website that at a FAQ on DHCP and it was at just the right level and that help.
It did not say, but implied that the DHCP server should be able to detect conflicts and resolve them. But at least this router/DHCP server count not.
I turned off the wireless port on the laptop and unplug the printer and desktop and rebooted the router.
Then connected the router via cable to the laptop and opened that connection and got a .2 assignement for the lap top.
Then connected the printer and could not access it. Cycled power on the printer and it forced a DHCP request and got assigned to .3
Then I could access the printer webpage using .3 from the laptop.2
The reconnected the desktop that has been assigned .3 and thought that it was still on it .3
Total confusion.
The desktop would not work and I could not access the printer.
Did a release renewal on the Desktop and noticed a strange thing. The DHCP server assigned it a new address, but did not have a name for it and it get only a 1 minute lease. When that times it and renewed the lease then it got the desktop name and gave it a 24 hr lease.
Anyway I restricted the router DHCP server to .2 to .31. That is probably 8 times the number that I will ever use at any one time.
And set the printer for static at .32
And set that address in the laptop printer port.
And the princesses kissed the frog and everyone lived happily ever after.
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