----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Charles Williams" <[EMAIL PROTECTED]> Cc: "Php-General (E-mail)" <[EMAIL PROTECTED]> Sent: Monday, March 18, 2002 10:12 PM Subject: Re: [PHP] Working with IP addresses
> On Mon, 18 Mar 2002, Charles Williams wrote: > > There will be a form with a text box to allow IP address entries as follows: > > > > 192.168.5.195 > > or > > 123.23.35.4 123.23.35.45 123.23.35.74 > > or > > 123.4.34.1/123.4.34.255 > > or > > 13.234.5.41/13.234.5.75 12.34.34.150/12.34.34.225 > > > > The above a just a few examples. I need to be able to grab either the IP > > addresses or the ranges and verify that when an IP is entered at a later > > date and compared to the above types of previously saved data that the IP is > > within the range(s). > > > > I hope I explained that ok. ;) > > > > So basically I guess I just need a way of, after retrieving the info from > > the DB, splitting the IP (range(s)) apart and then comparing the IP entered > > to those in the array(?) to verify that it was a good entry. > > It's not exactly clear to me what your question is. > > But, as to the general question of representing and comparing IP addresses > internally, I guess first you'd want to pick a representation that > efficiently and flexibly captures the values you expect to work with. > > Ordinarily I would suggest CIDR subnets but the sample IP addresses you > provided do not comply - they seem to be random numbers. Is this because > you need to deal with arbitrary sets of IP addresses rather than valid > subnets, or because you were just in a hurry while typing your message to > the list? > > Also, I wouldn't recommend using the slash to identify ranges of IP > addresses, because the slash already has a specific meaning in this > context: the number after it specifies the size of the subnet mask. For > instance, to refer to the range 192.168.34.128-192.168.34.135, you'd write > 192.168.34.128/29. > Sorry. forgot about the cisco standard thing there when I typed it all up. hehe. been a long day. Anyway. the IP addresses provided were just arbitrary addresses to show the format to be used. of course the /xx (cisco method) will be used and the IP-IP format will be used for a range as well. thanks for any help. > Anyway, I have a few ideas in mind but with an answer to the above > question I'd be able to give you what may be an optimal representation and > methodology. > > miguel > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
