Cisco Routers :: SA520 DHCP Lease Clients Removal
Nov 26, 2012
Is there a way on the security appliance SA520 to remove someone from the DHCP lease client manually rather than setting the DHCP lease time to expire in less time like 4 hours or 2 hours. I was able to do this on other routers by highlighting the connected device and click remove. If not any recommendations on how to handle the device that are attached via DHCP and the person is no longer here, but the lease time is not up. I have set DHCP lease time to 4 hours.
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Feb 12, 2013
Im facing with some DHCP lease issue and its like this,Our Cisco 2951 edge router is configured with local dhcp pool for a set of remote users when they connect through Cisco VPN which was working fine until we planned to change it to a Windows box that is configured for DHCP.The basic idea now is to relay the DHCP requests that are coming from the remote clients through Cisco VPN to the DHCP Windows server. So we added the scope on the server and changed the client config on the router as follows (highlighted is the dhcp relay config). [code]
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Aug 17, 2011
I'm setting up a Cisco Aironet 1141 (standalone mode, AP) to handle wireless traffic in the office. It gives out 2 mbssids, one of which authenticates domain users through a RADIUS server and places them in an appropriate VLAN (RADIUS options 64, 65, and 81). The other is a guest ssid that uses WPA-PSK and places users in the restricted guest VLAN. Physically, the AP is connected to a 3750 PoE Catalyst, to which RADIUS and DHCP servers are also connected. AP, SSIDs, RADIUS and EAP authentication all work. The configuration given below is a working configuration. People do get authenticated and do get placed in the appropriate vlan. The problem is that, once authenticated, the "Obtaining IP Address" phase on the client hangs and most clients timeout without getting an IP address. Given that the DHCP server is on the same switch and a test simple ASUS Wi-Fi IP gives out the same scenario (except the multiple VLAN) at the speed of light, I don't think that it's a problem with the network connections between clients and the DHCP server. After reading some topics here, I realized that probably other communication will be extremely slow, as well, but haven't tested that for sure. Clients are all non-Cisco - smartphones, notebooks, etc. Most of them are 802.11G, not N.
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Nov 22, 2011
I am trying to configure the DMZ on my SA520 router but without success.After a lot of tests I reduced everything to a very simple test case that is not working: I setted the "Optional Port Mode" to "DMZ" and enabled "DHCP Server" in the "DMZ Configuration", but DHCP on the DMZ does not assign any address.I am wondering if my optional port is broken or not.
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Jan 25, 2012
my RVS4000 is not renewing DHCP lease in Auto mode. Connection lost after 24 hours.
WAN Internet interface is physically connected to cable modem - Motorola SBV6120E. Setup as DHCP server. Cisco RVS4000 is obtaining DHCP public IP without any issue, the problem is that the connection drop every 24 hours and I need to release/renew DHCP each day to be able to communicate after 24 hours. After I loose connection I need to release DHCP, the WAN interface goes down and I need to renew DHCP then. I receive the same IP address and connection is againg UP and working.
tried to load new firmware and also setup the router with default configuration, but without any change. as there is no auto-reboot function, it is really annoying to log into managment interface each day. I also loose remote access after 24 hours, so I am not able to access the rotuer from outside. My local provider do not support static public IP on WAN, therefore I have to use DHCP.
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Mar 12, 2013
Today I installed the 1.0.2.6 Firmware on a RV180W. I only have now two problems regarding the Static DHCP support in the GUI.
1. Via the Networking > LAN (Local Network) > Static DHCP I have no buttons to Add a new static Lease.
2. Via the Networking > LAN (Local Network) > DHCP Lease Clients I can thick a Lease and click on Make Static IP. The result is an error: Operation failed.
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Jul 11, 2012
I have a few sites using the RV042 with wireless access points and some of them have over 50 devices.In reviewing the documentation (specifically,[URL]), I came across this:Enable DHCP server: Check the box to allow the router to dynamically assign IP addresses to up to 50 connected devices. Uncheck the box if you have another DHCP server on the network or you want to configure static IP addresses for your network devices.Is this accurate? Or will the RV042 allow more than 50 devices?
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Oct 9, 2012
I have a Cisco RV220W running the latest firmware (currently 1.0.4.17), and I have noticed that after about a week of use, wireless clients can no longer acquire IP addresses via DHCP.
I have used Network Monitor on both the DHCP server, and the WiFi client, and can see that the server is receiving the requests and sending a reply, but the client never sees the response from the server. So far the only way to resolve this is to reboot the router.
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Jun 4, 2013
All the SOHO routers I have used had a table which shows IP, MAC, Name, etc. In this table, I could easily put a check mark to a check box in a row that I would like to bind/reserve and IP would be reserved for that specific MAC.
In ISA570W, when I need to reserve/bind an IP to a MAC it asks me to fill out a table in which I have to manually type in the name, IP, and MAC.
Is there an easier way?Is there a way to do the reservation for multiple clients at once?If this is the only way, do I need to copy the mac address of each client somewhere and then reserve IPs for each one manually? This method looks very far from user friendly and efficient, unless there is a very logical reason that I cannot think of.
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Mar 28, 2011
delete a lease from a DHCP scope on a WLC 5508? I'm using that unit as the dhcp server, no relay. I am unable to find anything either through the web or cli.
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May 5, 2013
my Laptop is about nine years old, HP Pavillion Pentium 4. I run Windows XP Home Edition Version 2002 SP3. I use a broadband card from Verizon that I just put in my USB (no router, etc) I'm getting a System Error Source DHCP Event ID 1002. When this happens, my computer, I believe, is going into sleep mode and I have to reboot the system. When I turn it back on and go back on the internet, all my websites that I was in are still there. The error says: The IP address lease 10.170.223.48 for the Network Card with Network address 2c3068c16ED1 has been denied by the DHCP Server 10.173.229.86 (The DHCP Server sent a DHCPNACK message)The DHCP Server Service did not extend the lease on your computer's IP address, so your computer temporarily lost its connection with the Network. I tried the ipconfig /release and ipconfig /renew. I tried going in services.msc and going under DHCP and keeping it automatic but stopping it. I called Verizon and I believe he refreshed my Network settings (I think I knew more about the topic than he did) He said it was my computer, whatever. I just tried the static IP but it didn't seem to take. I restarted and it jumped back to automatic. My last guess is it's something to do with the time frame of when it automatically obtains the address and when it expires. When I do the ipconfig /all it shows only a two hour time frame before it expires. Today I noticed that my computer shut down/sleepmode at the exact time the ipaddress was obtained. So, is there a way to increase this time between obtaining and expiring?
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Jan 25, 2011
I've been having this issue for about 3 months now, off and on, never seemed to be predictable but started happening more and more, which prompted me to look into it.
Currently, the DSL Modem is configured in bridge mode with the ASA handling PPPoE. The WAN address is being assigned via DHCP. The ASA is running 8.2(1). The WAN interface will drop it's DHCP lease and will not renew it without power cycling the DSL modem. I did a little bit of googling and found mention of setting "dhcp-client client-id interface outside", specifically this was an issue pre 7.2(22), but doesn't seem to affect my situation. Originally, I had the MTU on the outside interface configured as 1500, changing it to 1492 has not resolved my issue either.
I've enabled PPPoE and DHCPC debugging and posted the results below when the event occurs, I'm thinking this is moreso a PPPoE issue than it is a DHCP/DHCP Lease issue as I am not seeing any debug messages from DHCPC.
Code...
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Jun 23, 2010
I have several Cisco WAP4410N access points. They are configured to automatically obtain an IP address through DHCP. This works fine, but I've discovered when the DHCP lease expires, the access point doesn't renew it. It continues to use the same IP address but does not renew the lease. If I reboot the access point, it will renew the lease again.Is this a known issue with the WAP4410N? Is there any way to work around this, other than setting a static IP address or rebooting regularly?
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Sep 26, 2012
I have a remote site on a 2811 IOS 12.4(15). Interface FA 0/0 faces the ISP and is set for DHCP. What command can I run to see all of the information given out with the IP lease from the ISP? I need to find out what the IP address of the DNS servers are.
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Jan 12, 2012
How to clear dhcp lease in WLC 6.0.199 from the IP leased from internal server?
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Aug 9, 2012
a couple days ago my BEFSR41 started making trouble, and so far I have not been able to get it working properly again. When I hook up my laptop directly to the cable modem everything works fine, and I get an IP address via DHCP. When I connect through the router, though, the router status shows 0.0.0.0 for all DNS, gateway, etc. addresses, and even pressing DHCP Release/Renew doesn't change that.Also, in the log I see these messages:
2012-08-08 20:30:41 warning DHCP RENEW WARNING - Field invalid in response
2012-08-08 08:30:52 notice TLV-11 - unrecognized OID
Since I can connect to the cable modem directly, it seems the cable modem is not at fault.My overall setup is:
- BEFCMU10 cable modem
- BEFSR41 (not sure which version, but I believe it's a 4.x)
- WAP54G
Could it be that my provider (Cox Communications) has changed some configuration in their DHCP server, and my laptop (MacBook Pro) can handle it, but the router cannot?
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Apr 1, 2011
I use an adsl router DSL-320B to connect my Linux server (Fedora 12) to the web.I noticed in my logs that it was renewing its ip about every 30s.
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Sep 25, 2011
i cant seem to change my dhcp lease time even though i change my Client Lease Time to 1 day.
Firmware Version:v1.0.06 build 001 Apr 29 2011 11:08:40Boot Code Version:v0.03Firmware Verification:Current Time:Sun, 25 Sep 2011 10:15:32 PMInternet MAC Address:Host Name: Domain Name:
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Jul 8, 2011
I just bought an e4200. I was using a LinkSys WRT54GS running DD-WRT alternative firmware.
One feature that I really liked in DD-WRT was the ability to assign static IP leases from the DHCP server. I liked having all of my devices running with a predictable, known IP address on my network. I have a Home Theater PC, and various controller applications that run on iPhones, etc. - some pretty homebrewed. Configuring the firewalls, etc. was much easier with IP address based controls.
Is there a way to achieve the same within the e4200's stock firmware?
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Jan 25, 2013
I own a Nanostation5 Loco, and I have a router behind it.I would like to add a DHCP Lease to that router and do a port forward to the router.I can not find the DHCP Lease option in Nanostation settings, but if I choose to see DHCP Leases in "Extra info" on main page I can see some MAC and IP addresses there.When it comes to port forwarding, I fill the form slots with info, and when I press OK to save it a pop-up comes saying "Please fill out this field", a field for another forward rule.
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Jun 11, 2012
we finally got my Cisco refurbished E2500 configured and working downstream from a UVerse 3801HGV box. We had to change the default IP address of the 3801 because it conflicted with the E2500's default. The E2500 is set up to get its Internet IP address using DHCP from the 3801. This is working fine for normal web browsing, etc. However, anything that requires extended connections (downloads, streaming, etc) freezes after a couple of minutes, forcing me to refresh the action to get it started again. Extremely annoying to say the least.
I'm pretty sure that I've tracked it down to the E2500's configuration of the 3801's DHCP allocation. For some reason, the E2500 wants to set the DHCP Lease Time for the 3801's assigned IP address to 10 minutes regardless of the upstream settings from the 3801. The 3801's default is 24 Hours which I've changed to 168Hours (7 days), but the E2500 stays stuck at 10 Minutes. Specifically, I'm referring to the setting displayed on the E2500 under Status>Router>Internet Connection IPV4>DHCP Lease Time.
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Jun 26, 2011
On the BEFSR41 v1 series and WRT54G series, what is the maximum value for the DHCP "Client Lease Time (in minutes)?" It seems that 2^16 -1 (65535) minutes is the max. This is about 45 days. has the max value changed with newer versions of these devices?
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Apr 28, 2013
I have a Linksys WRT310N v1 with firmware v1.0.10 build 002Jul 19, 2010 My router fails to renew it's DHCP lease from my cable provider, causing internet access to drop. I can still access my cable modem at 192.168.100.1, but I must do a "IP Address Release" then "IP Address Renew" to get back internet access. The router works fine otherwise.
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Apr 2, 2013
I'm trying to change the DHCP Client Lease Time from 1440 minutes to 480 minutes. When I try to apply the new settings, I'm getting a message that says "Invalid Characters" and it won't stick. I've tried this in three different up-to-date browsers (ie10, Chrome and Firefox). Also, I'm connecting locally through LAN and I have the latest EA6500 Firmware: 2.1.39.145204
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Nov 15, 2011
I am currently trying to configure a Remote Access VPN on a SA520 (Primary Firmware Version 2.1.51) using Cisco VPN Client (Ver 5.0.07.0410)
Until now i have connectivity from the SA to the LAN and i can connect using the Cisco VPN Client to the AS:
[IKE] INFO: IPsec-SA established[UDP encap 12856->4500]
[IKE] INFO: IPsec-SA established[UDP encap 12856->4500]
It gives me an IP from the pool but i can not reach through ping to my LAN.
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Jul 30, 2012
Two factor setup with Symantec VIP? I just fined setting it up and VIP Service and SA520 seems to be synchronizing correctly but device doesnt direct VPN users for second authentication ?
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Mar 20, 2012
I have a fibre connection on the dedicated WAN which was working perfect until someone somewhere cut through the line. The SA520 fell over to the Optional WAN port which is basic ADSL line which is connected. Logmein client is online too.
But it refuses to browse webpages, appears to be a dns issue or firewall or both.
I have added the ISP dns addresses into the forwarders on my server.
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Jan 30, 2012
We have Cisco SA520 and we want to use VPN to access the office servers from home. We have been able to configure the VPN server on the SA520 however the connection is very unstable.We use OS X 10.7 lion built-in Cisco compatible VPN clients and this is a typical output of ping from 3G mobile network to a server inside the office network. It works the same way also if I am trying to access from my home ADSL connection so the problem is not the instability of the 3G connection.
Some sample traffic sequeezed:
PING ns.svm (192.168.60.27): 56 data bytes
64 bytes from 192.168.60.27: icmp_seq=0 ttl=63 time=98.022 ms
64 bytes from 192.168.60.27: icmp_seq=1 ttl=63 time=76.934 ms
64 bytes from 192.168.60.27: icmp_seq=2 ttl=63 time=278.201 ms
[code]....
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Aug 7, 2011
We have a Cisco SA520 Router (Firmware 2.1.18)We are only using this for about 1 month now. Router seems ok its justI am worried about the Memory utilization which reach to 62% (144/234 MB)Is this something to worry about?How can I utilize this by lowering down the usage?
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Oct 23, 2011
I have an SA520 setup and all my users can login to the SSL VPN tunnel except one user. The laptop is running windows 7 64bit and had IE9 installed. When I try to connect her to use an SSL VPN Tunnel, I get the following error: Cisco-SSLVPN-Tunnel Install Failed: Error in getting proxy settings!. I have made sure the firewall was turned off. How to get the ssl tunnel connected?
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Jul 17, 2012
So I went to update the firmware on my SA520 last night and aparently something failed, the device restarted and now it doesn't respond to anything. The Diag light stays light and the factory reset button does nothing no matter how long I hold it in. Is there another way to reset the device?
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Sep 16, 2011
Is PVID the same thing as "native vlan"? Can the native VLAN be changed on a SA520? Currently I believe it to be 1, I'd like to change the native VLAN to 10.
I have a scenario where I have a prexisting production LAN of 192.168.1.0/24 . It's a small organization (a church), but they purchased 3 Aironet 1130ag units. They want to have a "private" WLAN that is part of 192.168.1.0/24 , and a guest WLAN of a different subnet (I chose 192.168.20.0/24) . The two should never meet. There will likely never be a guest computer connected via ethernet. Guest computers would always have to connect wirelessly.
I left VLAN 1 on the SA520 192.168.75.0/24 subnet as default.I created a VLAN 10 , 192.168.1.0/24 subnet, and I created a VLAN 20, 192.168.20.0/24 subnet.Ports 1-3 of the SA520 are members of VLAN 1, 10, and 20 (cannot remove membership of VLAN1, which is pretty annoying).
Both are secured by WPA, and when I connect, the proper DHCP subnet passes from the firewall through to the wireless client, for each respective SSID.Ultimately, I'd like the SBS 2003 server to handle DHCP for VLAN 10, and have the SA520 handle DHCP for VLAN 20, but i'll take what I can get.
The original production LAN is connected via an unmanged switch.I'd like to trunk the unmanaged switch to Port 4 on the SA520. However, since the PVID (native vlan?) of SA520 is 1, and I cannot make Port 4 on the SA520 ony a member of VLAN 10, then anything traffic coming from the unanaged switch will automatically be tagged with VLAN1, correct? Thus causing the already existing production network to start receiving DHCP from the firewall in the 192.168.75.0/24 range.
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Mar 26, 2013
N-Wireless modem Router F5D-8636 will not let me change the lease time from half an hour?
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