NETLINK NFLOG provides an interface used to communicate between used Netfilter and iptables.
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NETLINK XFRM provides an interface to manage the IPsec security association and security policy databases - mostly used by key-manager daemons using the Internet Key Exchange protocol.
NCIX.com (or Netlink Computer Inc.) is an online computer hardware and software retailer based in Richmond, British Columbia, Canada, founded in 1996 by Steve Wu (δΌεε).