The musings of an IT Consultant:

Cisco ASA

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February 29, 2012  5:03 PM

Cisco ASA DHCP issues on WAN port



Posted by: Raj Perumal
Cisco ASA, DHCP, ISP, WAN

Hi folks, so some people have reported having issues with the Cisco ASA firewall and acquiring an IP on the wan port from the ISP when set to DHCP mode instead of static. This is an issue that usually has nothing to do with the ASA, bu t with the ISP modem itself. Make sure you reboot the modem,...

March 31, 2010  10:55 PM

Cisco ASA upgrades….



Posted by: Raj Perumal
ASA 5505, Cisco ASA, RAM upgrade

Hi folks, so are you a fan of the Cisco ASA firewall? I am too! However if you use it, and want to use the latest firmware update you will need a RAM upgrade! With the latest upgrade to the Cisco ASA, unfortunately you need to order more RAM. But once you have this you will be good for all the...


April 29, 2009  3:52 PM

Cisco ASA Firewall dropping packets sporadically



Posted by: Raj Perumal
Adaptive Security Appliance, ASDM, Cisco ASA, dropped packets through firewall, faulty switch, using switch to split Internet

So here's an interesting issue I ran into with my Cisco ASA at home. It was working fine for quite sometime and then one day my wife told me that our Internet "was down". I was on my wireless connection via my laptop at the time, and my wife was using one of our desktop computers. My Internet...


April 29, 2009  3:45 PM

Cisco SSL VPN for the ASA



Posted by: Raj Perumal
#ssh, Adaptive Security Appliance, Cisco ASA, IPSEC VPN, RDP, SSL VPN, SSL VPN licenses, SSL VPN on the road

So you have probably heard about SSL VPN by now if you are a network administrator. This is the ability to use SSL to make a VPN connection between you and your corporate network. SSL VPN has been around for a long time but I still find that a lot of people haven't embraced it up here in...


April 29, 2009  3:07 PM

Rules not working in Cisco ASA as you thought they should



Posted by: Raj Perumal
Adaptive Security Appliance, ASDM, Cisco ASA, common Cisco ASA issues, implicit rules, inside access out, inside interface outgoing, outside access out, outside interface outgoing

Hi folks, as you know I've been doing a lot of work with the Cisco ASA firewall products lately and I wanted to address an issue I've seen a few administrators run into when setting up a new ASA. Often when you setup an ASA you are not just setting up inside out external access but you might...


April 28, 2009  4:15 PM

Overlapping Static NAT and Cisco ASA Firewalls



Posted by: Raj Perumal
Cisco, Cisco ASA, one to one NAT, Static NAT, static overlapping nat

Hi folks, I just wanted to discuss a key difference in some firewalls. One of the things you might find yourself doing, especially in a hosting scenario is creating static NAT entries. The entries are a one-to-one relationship between an external public IP address and an internal private IP address...


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