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Archive of posts filed under the linux category.

GRE bridging, IPsec and NFQUEUE

Playing around with tunneling.

Some notes on veth interfaces

One of many types of interfaces used for virtualization

Send email with attachment(s) from script or command line

To avoid having to search it every single time.

SSH auto-reconnect

Not a big issue, but it's easy to make it better.

Firewall HA with conntrackd and keepalived

Firewall failover without losing stateful connection tracking