Block Iphone / Devices From Getting IP Address From DHCP?

Feb 23, 2012

I've came across IP address that aren't enough for some users in the company. The IP addresses are more than enough to cater to the user's notebook or PC. However, some users does not know that there are actually limits to the IP we have, so quite a number of them actually uses their mobile / pads to tap the company's wireless.

I was wondering if i could restrict that particular user from tapping onto the network. I know it sounds a bit impossible because DHCP doesnt have that smart function to block whoever we sees deemed as a "nuisance".

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Cisco Switches :: SF500-24P / Devices In VLAN Can't Get DHCP Address From Router

Oct 11, 2012

I'm trying to set up a new Cisco SF500-24P switch for our new Polycom IP phones but I'm having some trouble configuring them. It seems a fairly basic setup - We have a Cisco 2800 series router which is configured in a router-on-a-stick scenario to give DHCP addresses to two vlans, '1' for data and '20' for voice...
 
ip dhcp pool DHCPROUTER
   network 10.10.0.0 255.255.255.0
   default-router 10.10.0.1
   dns-server 10.20.124.200 10.20.124.201

[cod]....
 
The switch worked practically straight out of the box- when I connected a PC or a phone into it they both got addresses in the 10.10.0.0 range and both worked fine. In the web interface I then set the Voice VLAN ID as 20 and as soon as I did this the phones can no longer get addresses from DHCP (although PCs can). The switch and the phone display both show that the phone is in VLAN 20. All ports are members of VLAN1(native, untagged) and VLAN 20 (tagged) and the port connecting to the router is trunked, as are the others.Also, I can ping 172.16.0.1 from the switch so there is no routing problem, although I did try using the switch as a DHCP relay to 172.16.0.1 but still no luck.I'm not sure how relevant this is but one thing I noticed is that data going to the router untagged (and therefore in VLAN 1) gets through but if I tag it with VLAN 1 then it doesn't.

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Aug 16, 2012

I have an exisitng ASA5520 which is already working with remote clients using Cisco vpn client configured using ipsec over tcp, I am now trying to get vpn access for Iphones working and having a problem where once connected the Iphone cannot ping any internal device. The configuration on the Iphone does not allow for Ipsec over tcp and therefore uses udp 500 by default, if i create a new profile from a pc and do not use ipsec over tcp it has the same issue where it establishes a vpn tunnel but cannot ping any internal device as soon as I change the profile to ipsec over tcp it works fine.

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I'm still having bad time with the basic configuration I'm trying to make 2 VLANS: voice and data and run DHCP server on router hoping it will give the Ip Phone an IP address but I don't know where the problem is.

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I'm facing a problem on vWLC. I configured the vWLC and Aironet 1252, I created 2 SSID with below settings.

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2. Web-Auth
 
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Jan 15, 2011

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which current SB routers support these features known from RVL200 and RV0XX v. 1.X?:
 
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I'm using 2003 server for DHCP settings. I don't want some computers to get ip address automatically but if they put manually ip address, it's ok, they can connect.How it can be done?I mean when those computers try to connect for wireless, they should not get any ip address (so internet) until they put manually ip address, default gateway and dns server.

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we have Cisco 6509 as a access switch in our network. Each user has an IP phone and a computer. we are going to implement 802.1X for end users by next month. I need to check all the users activity in the network like if someone plug an access point to the network or a router.I just checked Cisco NAC and how to detect those activities on the network.
 
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is it agent less or I have to install something on computers? is it working as a default router for users computers?

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I have a ASA 5505 that I have been using for a while, but a new ISP is trying to configure my service so that the outside interface has to be configured as DHCP to receive a reserved IP address, and then they will route a separate, non-contiguous block of addresses to that address.
 
Essentially, they have a DHCP reservation for 1.2.3.4 for my ASA, and then they have 10.2.3.16/28 as a separate block routed to me.
 
Obviously, I can do my static NAT translations using outside as the address, but I cannot get the separate block of addresses to route through the ASA. Is there a way to do this and get them to work? My ASA is running 7.2(2)

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I have two 3560x Catalyst switches setup between two different locations. They link via a PTP line (Layer 2). I have setup Intervlan routing between the switches and that works fine.Each location has a separate subnet and a Windows DHCP server for each subnet.I want to block any DHCP requests to be sent from hosts on one subnet to the DHCP server on the other side (i.e across the PTP link) What is the best method to do this?

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Feb 16, 2011

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[code]...

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So if the PPTP server is enabled, and "Block MAC address not on the list" is enabled under the DHCP settings, will the PPTP client get an IP address?Similarly, if the PPTP server is enabled and the range of IP addresses configured on the PPTP server screen is outside the IP range of the router due to a subnet mask (like 255.255.225.248 for example), will the IP still be assigned to the PPTP client? If assigned, will that IP have any connectivity to the LAN?

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