Static IP on Ethernet Port issue

mykro28

Hi all,

New to Mac, but I am not going to ask how to assign a static IP, I can do that. The issue is with the subnet mask. I am trying to use 24 bit mask, (255.255.255.0) with a class A address, of 10.10.10.1. This should not be an issue. As I am typing in the mask I hear an alert sound and the field goes blank. The only way I managed to get it to stick was to paste it in and press apply really quick. Am I missing something obvious, why does it keep making the mask blank???
If I left the mask blank it was using the default class A but in terminal it was showing the mask in HEX. Do i need to enter the mask n HEX????

Cheers

FruitLover

Your terminal is probably showing you an IPv6 address.

What happens when you assign the IP via the terminal?

mykro28

Here is the output from the terminal;
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::226:b0ff:fed5:eeac%en0 prefixlen 64 scopeid 0x4
inet 10.10.10.1 netmask 0xffffff00 broadcast 10.10.10.255
ether 00:26:b0:d5:ee:ac
media: autoselect (10baseT/UTP <half-duplex>) status: active

You can see the netmask is in HEX, which is 255.255.255.0, after I pasted it into the box and pressed apply really quickly!!...
It seems that when I use Sys Prefs and Networking, after about 3 to 5 seconds of clicking on the field for MASK, i get the alert sound and it looses focus, (blue glow around the input box disapears).
When you say assign it from the terminal do you mean by using ifconfig or if there another tool for OSX??
interesting times......

nialler

shift-cmd(apple)-4 take a screen shot of the window and post up to illustrate what you're doing. Assigning static IPs on os x is much much easier than doing it in windows.

mykro28

Picture should be attached. It should be simple but for some reason when I try to enter the mask in the space provided it just keeps blanking itself. I have nothing connected to the PC, I am not leaning on the trackpad and I have tried it with the ethernet connected and disconnected.
Is there something simple that I am missing???

Thanks for the replies so far!

Isn't that subnet a class C?

Shouldn't it be a class A 255.0.0.0

Sorry, I could well be wrong,
apologies in advance if so, very tired at the mo.

--

Maybe delete that config, and add another by pressing the '+' sign in the bottom left above the lock.

mykro28

That was my first thought, but OSX can not be that bad to not allow sub-netting???
10.x.x.x is a class A and without sub-netting it should be 255.0.0.0. With the finite number of address it is common place to subnet them. In my case I am using the 10.10.10.x subnet determined by the mask 255.255.255.0.

FruitLover

It looks like it has applied, hex FFFFFF00 is the same as dotted-decimal 255.255.255.0. If it's working, I wouldn't worry about it too much.

NoDrama wrote: »

Isn't that subnet a class C?

Shouldn't it be a class A 255.0.0.0

Any modern OS should be able to support classless subnetting.

Just to clarify, network 'classes' have to do with certain bits in the first octet being set or unset, they're not determined by the network mask (if anything, it's the other way around).

mykro28

I get that, and thanks for the reply. The issue is that I it wont let me type in a subnet mask. As I start typing, it just blanks itself. I can enter a subnet mask if I paste it in quickly and then click apply.
Not to worry, I will be doing a fresh install to snow leopard soon.
Thanks to all who replied!!