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Network Security

Windows - Prevent NIC from being disabled when VPN is setup

Lately we've started noticing an issue where on some laptops the LTE adapter would be shortly disabled and re-enable when attempting to setup a VPN (SSTP in our case). We found out that there is a policy setting in Windows that is left to default values allows the operating system to disable unneeded network connections. In a nutshell it looks like once the VPN adapter is up a ...

Dissecting a DNS Amplification DDoS attack

Today we had to investigate a sudden spike in outbound internet traffic on a small business' network. The symptoms reported were a sudden slowness browsing the internet from machines connected to the SMB's LAN. A quick peek on a network usage graph revealed a sudden increase in outbound traffic, see the blue line while the inbound traffic volume was relatively low (green area) ...