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

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 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 from the switch so there is no routing problem, although I did try using the switch as a DHCP relay to 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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Cisco VPN :: Iphone Ipsec To ASA5520 Not Communicating To Local Devices

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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Cisco :: DHCP Is Not Giving Ip To IPhone

Jun 26, 2012

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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Cisco Wireless :: VWLC And Aironet 1252 - All Client Devices Such As IPhone / Laptop Can't Find SSID

Sep 6, 2012

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

1. WPA2 Auth 802.1X
2. Web-Auth
Inside Wireless, I configured this AP Mode as "Local", but all of the client device such as iPhone, Laptop can't find these SSID.

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To Block Devices On 2wire Router 2700HGV

May 2, 2011

Noticed several devices have connected through my home network previously. Not sure how it is done,currently these inactive devices are displayed, i would like to know how can i block them from the firewall just in case it is connecting again?

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How To Block Certain Wired Devices From Connecting To Router

Jan 15, 2011

I have a linksys wrt54g router. i need to block all devices except one from plugging in a wired device into the back of the router. i tried the mac filtering, but i didnt work. Is that for wireless only?I can also block local ips (192.168.1.x), and was going to go that route and only allow my local computer but i was afraid if i restarted my router or computer the ip would change and i would be locked out.

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D-Link DIR-825 :: Block Internet Access To All Devices

Aug 22, 2011

I am trying to allow a block of 7 or 8 devices to access the internet all the time.  Two other devices I would like to allow internet access during a set time range.  Finally I would like to block internet access to all devices not in one of the above groups.  I need to use MAC addressing to identify the allowed devices.  I was able to do this with my old WRT-54G but the DIR-825 is giving me trouble.My main problem occurs when I try to block access to "Other Machines".  When I do that all devices on my network are cut off the internet.

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Cisco Routers :: RVL200 - Using Static IP List To Block Devices

Nov 29, 2011

which current SB routers support these features known from RVL200 and RV0XX v. 1.X?:
Block MAC address on the list with wrong IP address

Block MAC address not on the list

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Block Getting Ip From 2003 DHCP Server?

Apr 5, 2011

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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Cisco AAA/Identity/Nac :: 6509 - Detect And Block Unauthorized Devices / Users In Network

Sep 25, 2012

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.
I need to get more details on Cisco NAC or other products for that purpose. also what is the difference between Cisco NAC and application like Microsoft TMG?
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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Cisco Firewall :: ASA 5505-ISP Providing DHCP And Separate IP Block

Mar 12, 2011

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 for my ASA, and then they have 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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Cisco Switching/Routing :: 3560x / Block DHCP Requests Over VLANs

Jan 10, 2012

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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Cisco Switching/Routing :: Block All DHCP Packets Through 2960S LAN Base IOS?

Mar 23, 2013

I am trying to block all dhcp packets through 2960S lan base IOS. But when i set no trust interface for dhcp snooping, the dhcp packet source port will be err-disabled.  Is there any other solution to block any DHCP packet through switch without interface or other service outage?Is possible to block DHCP packet through specific VLAN?

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Block A Computer By Its MAC Address Not By IP?

Feb 16, 2011

I want to block a computer by its MAC address, not by IP, from accessing Internet.

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How To Block Mac Address In Windows 7

May 21, 2012

I have blocked a hacker from hacking my pc, I tracked his IP and then blocked it.

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Cisco Switching/Routing :: 3750 - How To Block Unauthorized DHCP SOHO Router

Jan 20, 2012

If it's possible, how do you protect/block a unauthorized DHCP SOHO router with NAT form a Cisco 3750?

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Cisco :: Private Address Block -

Apr 11, 2011

how the address stops at 31 in the second octet. I'm not even completely sure how it starts at 16 for the first address ( are we dealing with subnets?

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Block A Mac Address From Home Network?

Dec 16, 2012

How to block a mac address from my home network?

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Dual DHCP Or Access Devices On Different Subnet?

Aug 23, 2011

I have a problem with my 2 networks which are 1000 meters apart.One is my HOME the other is my CARAVAN SITE. both networks are working fine independently, the problem occurs when i join the networks together.I need to connect the said networks together in order to view my IP cameras which are dotted all around the campsite, i need to be able to view these from HOME.The problems i am having is DHCP servers are stealing clients from the other sides and directing them to the wrong gateway.please see below network map (these routers are all running DDWRTBelow is another network map which someone on another forum told me to do but its still not working. (DHCP servers are still clashing and still stealing clients)y the way, on both of the network maps all routers are connected with the LAN interface. someone told me to connect certain routers with WAN and it didn't work, or it was not explained correctly.Also please note that assigning clients with Static IP's is completely out of the question due to most of the clients being campers who come and go

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Linksys E2000 Router - Block LAN Mac Address?

May 10, 2011

what would be the easiest way of blocking a mac address from LAN not wireless, the router is Linksys E2000 and the reason isnt important, just that i want to do it, i have full access to router

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D-Link DIR-655 :: Need To Block Certain IP Address To Be Accessed By All Computers

Dec 3, 2011

Bought DIR-655 from Amazon. Rev. B. Come with 2.00NA firmware. Updated to latest one, and there are a lot of problems, to most of them, I was not able find any solution. Here they start:

1. WIFI SPEED PROBLEMS.No matter what speed, parameters, channel, mode, etc I select, router keeps working on 20mhz channel width. So I never get speeds above 65 mbit. In absolutely same conditions, my DIR-300 B1 (with DD-WRT firmware) gives me stable 150mbit. SO I KINDLY ASK, MAYBE THERE IS A WAY TO FORCE "40 MHZ ONLY" OPTION?

2. PASSWORD PROBLEMS.Router came with no admin password, I enter new password, hit "update" it says - wait 20 sec, after that, login page is displayed, but, new pasword does not works! since it asks again for empty password!

3. FILTERING PROBLEMS.I need to block certain IP address to be accesed by all my computers. Say this is . So I added inbound filter rule, to block access to that IP. It does not works - IP is still accesible.

4. MORE FILTERING PROBLEMS.Since above mentioned method does not works, I have to use "ACCESS CONTROL" feature. It does works, but it causes another problem, with access control enabled, all webpages with form submit stop to work. For example, if I'll have that feature enabled, when I press "post" on this webpage, it instantly will go to "this page cannot be displayed".

I bought this router solely for one purpose - I was happy with speed of my DIR-300, but I needed gigabit for my computers. So I thought, instead of buying separate switch, I'd better buy a router with gigabit. I was suggested to get TP-LINK 1043, since it's quite popular, alternate firmwares available and so on, but I refused to buy it, since I thought that some chinese company does not worth my attention. So I bought this D-Link (for almost 2x price of TP-Link) and having huge problems as you can see.

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D-Link DIR-655 :: Access Control - Block All Computers Instead Of Specified MAC Address

Aug 8, 2012

I want to do what I thought would have been a simple enough task - block my kids phone/computer after certain hours. Instead of blocking the specified MAC address(es), all my computers does not have internet access. As soon as I disable the policy, internet access is on again. Here's what I did:


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Linksys Wireless Router :: Block An IP Address With WRVS4400N?

Nov 8, 2009

I've been keeping an eye on my IPS report tab lately and have been watching a large number of ICMP_SMURF and DOS attacks originating from chinese ip address's.  I know I can probably block the offending ip's through the ip based acl tab in the firewall settings, but I'm kind of a newbie how I can block certain ip's from touching my router?

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Cisco Firewall :: Block Website Or Ip Address From ASA 5505?

Apr 27, 2011

if it is possible to block a website or ip address from an ASA 5505? if it is possible, can you give me an example of the commands to get it done?

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Cisco Firewall :: ASA5510 - Block IP Address From Outside Interface

Jun 23, 2011

Recently, I've been having significant problems with denial of service on our ASA-5510. Two IP addresses in particular attack my ASA regularly. What kind of rule do I need to create to deny these IP's access to my firewall?

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D-Link DIR-600 :: No Devices Listed On Number Of Dynamic DHCP Clients

Jul 27, 2012

I recently noticed my 'Number of Dynamic DHCP Clients' on Network Settings is always empty. Before, it always registered a list since there are several devices that are connected to our wireless network (laptops, mobile phones, desktops).

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Linksys Cable / DSL :: WAG120N Dhcp Reservation / Attached Devices?

Jul 9, 2010

I've just got a WAG120N router and can't see anyway to see what devices are attached to the router or be able to assign static IP's

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How Does Firewall Block Or Filter Traffic On Specific Port Or IP Address

Nov 15, 2011

How does a firewall block or filter traffic on a specific port or IP address?

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Block 1433 Port With Access List For Specific Ip Address?

Jan 2, 2012

I want to block the sql port access of my server to all except few of my ip addresses while access list on Cisco Router IOS how do i do that.

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Linksys Cable / DSL :: WAG160Nv2 / Block Specific External Ip Address?

Jul 8, 2011

I have a WAG160Nv2 and I want to block specific external ip addresses from trying to get at our server that uses the WAG160Nv2 as an internet gateway. It's not immediately obvious if this can be done from looking through the config pages.

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Linksys Wireless Router :: E4200 V2 - Block Public IP Address?

Feb 2, 2013

i got an E4200 V2 and it is updated to Linksys Smart Wifi firmware.. Is it possible to block a specific public IP address?

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Cisco Routers :: RV016 PPTP Server And Block MAC Address

Apr 2, 2013

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 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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