Question about Cisco ASA 5500 Firewall

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Laptop suddenly loses connectity on port but IP phone stays connected with no problem. Will not recover until a reboot of the 5505. I move the laptop to the phone port and the laptop reconnect instantly. move back to the PC port and it fails to get the dhcp address. defaults to some strange address. Reboot the unit and everything is perfect for days. Please help

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  • Contributor
  • 26 Answers

Check your DHCP server settings. Do you have your voice and data riding on the same subnet? I would start at the DHCP server and work my way back to what the configuration of the phones IP, GW and subnet mask are and verify that it is pulling from the correct pool of addresses. It is always best to segment network traffic especially voice and data but if it is pulling from the phone reverify the settings on each device and check your DHCP pool, it could be out of addresses in the IP range, or configuration settings are not set correctly. Hope it helps you out!

Cheers!

J the Guru

Posted on Oct 16, 2017

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6ya6ya
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Posted on Jan 02, 2017

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Benimur
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SOURCE: router cannot get IP with cisco 675 modem

Hi,

The issue may be due to the existence of two (2) DHCP servers; 1 in the Cisco 675 and the 2nd in the DLink DI-524. You need to disable the Cisco's DHCP server function and assign static IP add & config to the DLink WAN config. This way it will only be the DLink handing out IP adds to the network.

The workaround. Install your original configuration/setting without the DLink DI-524 - PC direct to the Cisco 675 (I am assuming through Ethernet ports). Verify that indeed you are connected to the Internet and can surf the net, check e-mails, etc. Check your Networking Connection Status. Log down your PC's IP Add, Subnet Mask, Default Gateway, DNS. For purposes of discussion, let's call this "N1".

After your Internet connection has been verified with your PC directly connected to the Cisco, remove the direct connection and connect the DLink DI-524 in between the Cisco router and your PC.

Log in to the DLink and modify WAN parameters using the "N1" configurations/settings.

It might be of help to disable any security (WEP WPA, MAC etc) at least while configuring.

Hope this be of help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

Posted on Feb 01, 2008

  • 53 Answers

SOURCE: Can't get an IP address over time.

Ok I have guessed a couple of things. Here goes.
the version of software 12.4 (3g) is very old
I think that you have DHCP configured on the AP

the cisco site lists loads of issues regarding DHCP and memory leaks in numerous guises with not only your IOS version but newer versions too.

the reason why I have homed in on this is that you say that the unit works for about a week then essentially stops until you reboot the AP. (I guess that you do this by power cycling not by issuing the reload command) in the short term you have fixed the problem.

I would suggest that you upgrade the IOS to something newer. the current version listed is 12.4(22)T if it's of any help.

lastly as you know when the system actually goes wrong. You are able to issue the reload command with additional settings so it could reload @ X date and time if NTP is configured or you can specify a time duration in minutes if preferred.

I can't think of anything else I afraid.

Posted on Nov 06, 2008

ward_knutson
  • 64 Answers

SOURCE: Converting Cisco 7940 IP Phone to SIP

Unlocking a Cisco 7940

Method 1:
1) Unplug the phone
2) Plug the phone back in while holding the # key
The phone will soon display “Reset key sequence detected”
3) After several lights flash press the following keys in order:
1 2 3 4 5 6 7 8 9 * 0 #
4) The phone will then ask you if you want to save the network configurations:
Save network cfg? 1=yes 2=no
5) The phone will soon display “Factory reset initiated” and will continue
through the boot up process.
If that process fails to work for some reason there
is a second method.

Method 2

Complete these steps:

  1. Press Settings.
  2. The Network Configuration lock symbol must be unlocked. If not, exit to the main window and press ** # again.
  3. Press 3 on the keypad (or scroll down) for Network Configuration.
  4. Press 33 on the keypad (or scroll down) to Erase Configuration.
  5. Press the Yes softkey.
  6. Press the Save softkey.
The phone will now be reset.

Also see this link
http://www.cisco.com/univercd/cc/td/...tain.htm#93250

Posted on Nov 25, 2008

SteveRand
  • 210 Answers

SOURCE: Sending DHCP request across diffrent vlans

Hmm... on your DHCP server, try setting the "default router" IP for each pool to be the VLAN ID on the switch.

scope 172.16.0.0 /24
router 172.16.0.1

scope 10.20.8.0 /22
router 10.20.8.1

I think the DHCP replies aren't going back where they should. I've never done this without a router doing all the DHCP, but it does work and i've done it many times. Your config looks spot on for the switch.

Posted on Feb 05, 2009

  • 2 Answers

SOURCE: Ip address for clients using autonomous cisco 1130ag witout dchp

the cisco1130ag will provide ip addresses and serve as a DHCP server for your laptops...

You still need an IP address for your 1130ag so either your ISP provides you a static ip that you can put in the 1130 or if your ISP provides dhcp then you should be able to plug and play with your 1130ag

Posted on Mar 12, 2009

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