Security Basics mailing list archives
RE: Preventing DHCP from allocating IPs
From: "Rick Darsey" <rdarsey () aims1 com>
Date: Tue, 3 Dec 2002 14:04:55 -0600
I know this sounds like a really bad way of doing this, but it is the only way I can come up with off the top of my head: Turn of DHCP!! Statically assign all addresses in your LAN. If a visitor wants access to your network, they will have to come to you to obtain the address, or better yet, create a small DHCP pool that visitors can use, but limit the size to prevent users you do not want from accessing the network. The initial setup of the static addresses will take time, but the small DHCP pool will still allow visitors to plug in when needed. Rick -----Original Message----- From: jon kintner [mailto:jon.kintner () lvcm com] Sent: Monday, December 02, 2002 1:04 PM To: ssgill () gilltechnologies com; security-basics () securityfocus com Subject: Re: Preventing DHCP from allocating IPs I know mac addresses can be spoofed pretty easily, but could you setup an access list or filter that would disallow all mac addresses except for the ones specified on your network(s)? The initial setup would probably be tedious, but it's worked fairly well to keep most unauthorized logins off the network at the college I attend. -jon kintner ----- Original Message ----- From: "Sarbjit Singh Gill" <ssgill () gilltechnologies com> To: <security-basics () securityfocus com> Sent: Monday, December 02, 2002 7:22 AM Subject: Preventing DHCP from allocating IPs
Greetings all, How do i prevent a client from getting an IP from my DHCP in an Ethernet network. I know i could reserve IPs for all other clients and nobody gets
an
IP unless reserved earlier, but i have hundreds of clients. I frequently have visitors who need to plug in their laptops into the network and i
have
visitors who are not allowed to plug in their laptops into the network and get IPs. I do not want these visitors who are not allowed to access the network to get an IP and start accessing internet through my network. What about in a wireless environment. How do i prevent it in a similar capacity. Kind Regards Gill
Current thread:
- Preventing DHCP from allocating IPs Sarbjit Singh Gill (Dec 02)
- RE: Preventing DHCP from allocating IPs Jimmy Sansi (Dec 03)
- RE: Preventing DHCP from allocating IPs Sarbjit Singh Gill (Dec 05)
- Re: Preventing DHCP from allocating IPs jon kintner (Dec 03)
- Re: Preventing DHCP from allocating IPs Pauling (Dec 04)
- Re: Preventing DHCP from allocating IPs Tony Meman (Dec 06)
- RE: Preventing DHCP from allocating IPs Rick Darsey (Dec 04)
- Re: Preventing DHCP from allocating IPs jon kintner (Dec 04)
- RE: Preventing DHCP from allocating IPs Sarbjit Singh Gill (Dec 05)
- Re: Preventing DHCP from allocating IPs Hasnain Atique (Dec 06)
- RE: Preventing DHCP from allocating IPs Sarbjit Singh Gill (Dec 06)
- Re: Preventing DHCP from allocating IPs Hasnain Atique (Dec 06)
- Re: Preventing DHCP from allocating IPs Tony Meman (Dec 09)
- Re: Preventing DHCP from allocating IPs jon kintner (Dec 09)
- Re: Preventing DHCP from allocating IPs Gene (Dec 11)
- Re: Preventing DHCP from allocating IPs Tony Meman (Dec 12)
- Re: Preventing DHCP from allocating IPs Pauling (Dec 04)
- RE: Preventing DHCP from allocating IPs Jimmy Sansi (Dec 03)
- <Possible follow-ups>
- Re: Preventing DHCP from allocating IPs Fred Williams (Dec 04)