Tag: ARP
Configuration Example, Firewalling
McAfee Firewall – NAT mapping
While testing a McAfee Enterprise Firewall running software 8.2.0, I had some problems with the creation of a NAT mapping. The firewall is configured as standalone firewall. All (NAT / access rule) configuration on the firewall is done using Access Control Rules. McAfee uses two types of NAT mapping: NAT: mostly used to translate a … Read More
Cisco ASA & ESX: strange ARP behavior
Last week I had a very strange problem with a Cisco ASA firewall. The firewall is configured with multiple interfaces, including a DMZ interface. There are multiple servers in the DMZ. These servers are physical and virtual servers. The virtual servers are VMware servers in a blade environment. I configured the feature ip verify reverse-path … Read More
Configuration Example, Security, Switching
Layer 2 security
I attended the session layer 2 security, because I had some discussions about layer 2 security with one of my colleagues. We were discussing about using layer 2 security and especially implementing it in the environments from our customers. Looking at my/our customers, I don’t see environments where layer 2 threats would be immediate. But … Read More
WebMarshal performance problems
One of our customers is using WebMarshal for HTTP/HTTPS URL filtering and content scanning. The WebMarshall software is installed on two Microsoft ISA 2003 servers. These ISA servers are behind a Cisco Content Switch for load-balancing and redundancy purposes. The problem with the WebMarshal is the PERFORMANCE. Internet browsing with the WebMarshal as proxy just … Read More