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Category Archives: Networking
Force DNS Lookup Over Windows VPN Connection
A common problem with Remote Access VPN connections is how to force DNS name resolution across the VPN tunnel. With Windows you will likely need to modify the Windows DNS Client behavior by changing the Network Interface Binding Order (older … Continue reading
Cisco ASA Defaults that Break Things
The Cisco ASA is an excellent network security device, but several factory defaults can break some typical network traffic. These settings might be good to change on standard deployments. Turn On “inspect icmp” to allow ping responses through Turn On … Continue reading
Cisco ASA Troubleshoot IKE Policy
Notes for troubleshooting Cisco ASA IKE Policy – there must be a match between site-to-site / lan-to-lan (L2L) endpoint IPSec Peers for the ISAKMP (IKE) session to be established. Traditionally this was known of IPSec Phase One, but as of … Continue reading
Cisco ASA Command Line Basics
This post is for people who are new to the Cisco ASA command line, or seasoned network administrators like myself who need to review or brush up on the command line basics for the ASA console. Instead of using my … Continue reading
Posted in Networking, System Administration
Tagged Cisco ASA, CLI, Command-line interface
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AES-GCM on Cisco ASA
This is a request for comments to clarify network security proper usage of new AES-GCM cryptography functionality on the Cisco ASA platform. Please leave a comment if you can provide some insight to help readers better informed on how and … Continue reading
Get Rid of virbr0
In RHEL 7.x and CentOS 7.x you may see an odd extra network interface listed as “virbr0” (virtual bridge zero). This is provided as a default way to share the host physical network with private guest virtual machines. Unfortunately this … Continue reading
Posted in Linux, Networking, System Administration
Tagged Active Directory, CentOS, DNS, RHEL 7
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IPv6 Users and Devices
There is good news for IPv6 as the future protocol of the Internet. It has been a long and rough road, but people are finally beginning to use NATIVE IPv6 to access web services. The funny thing is that the … Continue reading
Windows DHCP Failover Load Balancing
Windows Server 2012 (and newer) provide a powerful option for DHCP service high availability. You configure a DHCP scope on one server and then configure “Failover Load Balancing” to replicate the scope to the partner DHCP server. This new DHCP … Continue reading
Broadcom QLogic VMQ Hyper-V Network Bug
UPDATE August 2017, following this issue as it’s in my top 10 most viewed posts. User @StephanF over on forums.veeam.com reports that the issue persists with newer 10G Broadcom/QLogic NIC’s. “Updates of drivers, NIC firmware etc. did not help … … Continue reading
Policy Based Routing on Cisco ASA
One feature I’ve been wanting on the Cisco ASA has finally been added in software release 9.4.x, Policy Based Routing (PBR). This allows traffic to be sent to different ISP connections based on your desired match criteria (specific source network, … Continue reading
Notes by Tom 