Tag Archives: security
Revisiting Two-Factor Authentication on PayPal
I’ve been using 2FA on PayPal since 2007, when they introduced the feature with a modestly priced physical token. I later switched to a free soft token, specifically the Symantec VIP app, which I wrote about back in 2013. But … Continue reading
Implementing an IP blocklist with firewalld
In 2013 I wrote about using IP sets and iptables to block IP addresses from a blocklist provided by organizations such as OpenBL. The Bash script I wrote for that was usable at the time, but in the intervening years many Linux distributions (including … Continue reading
Mass blocking of evil IP addresses with iptables and IP sets
When running a Linux server or firewall it may be useful to use iptables to block a list of known “evil” IP addresses. There are many organizations maintaining “block lists” of such IPs, such as Spamhaus, DShield, and OpenBL. Blocking … Continue reading
Two-Factor Authentication on PayPal with Symantec VIP Access Soft Token App
Awareness of two-factor authentication (AKA “2FA”) is growing among the increasingly security-conscious public. Many companies including Google, Facebook, Microsoft, Twitter, and many others have been implementing 2FA support lately. Interestingly, eBay and PayPal were actually on the forefront of this trend … Continue reading
Fixing a Windows PC that fell off the domain with netdom resetpwd
Recently I had a problem with a Windows 7 desktop serving as my HTPC. It stopped automatically connecting to my PEAP-secured Wi-Fi network at boot time, and would only connect if someone with Wi-Fi permissions logged on to it. The … Continue reading
Securing Wi-Fi with PEAP and FreeRADIUS on CentOS
I recently read Low-cost RADIUS servers for Wi-Fi security, a review of four RADIUS servers with an emphasis on Wi-Fi network security use cases. The main complaint about FreeRADIUS, the only no-cost option mentioned, is the difficulty of configuration. To see … Continue reading