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IPv6 Behind a Proxy Fails in Three Different Places. Learn to Tell Them Apart.

IPv6 Behind a Proxy Fails in Three Different Places. Learn to Tell Them Apart.

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5 min read
Case study (hypothetical): the site that was down only for people on IPv6, and every monitor said it was fine

Case study (hypothetical): the site that was down only for people on IPv6, and every monitor said it was fine

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5 min read
IPv6 Router Advertisements carry routing trust into every host

IPv6 Router Advertisements carry routing trust into every host

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3 min read
Response Checklist for CVE-2026-97597 in Shared and Multi-Tenant Linux Hosts

Response Checklist for CVE-2026-97597 in Shared and Multi-Tenant Linux Hosts

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3 min read
IPv6 in Production: Dual-Stack Without Breaking IPv4

IPv6 in Production: Dual-Stack Without Breaking IPv4

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3 min read
Why Android says "Connected, no internet": a foreign IPv6 router advertisement from a 5G router (CPE)

Why Android says "Connected, no internet": a foreign IPv6 router advertisement from a 5G router (CPE)

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8 min read
How a NAT VPS works: shared IPv4, your own ports, and a routed /80 of IPv6

How a NAT VPS works: shared IPv4, your own ports, and a routed /80 of IPv6

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2 min read
tcpdump and Wireshark Filters for IPv6: Practical Recipes and the Extension Header Caveat

tcpdump and Wireshark Filters for IPv6: Practical Recipes and the Extension Header Caveat

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4 min read
Rate Limiting and Banning IPv6 Clients by /64 with nftables

Rate Limiting and Banning IPv6 Clients by /64 with nftables

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4 min read
IPv6 Logging and Abuse Handling: Why the /64 Is the Unit

IPv6 Logging and Abuse Handling: Why the /64 Is the Unit

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4 min read
GeoIP and Geofeeds: Getting an IPv6 Prefix Located Correctly

GeoIP and Geofeeds: Getting an IPv6 Prefix Located Correctly

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4 min read
DHCPv6 Prefix Delegation Explained: How a Router Gets Its Own IPv6 Prefix

DHCPv6 Prefix Delegation Explained: How a Router Gets Its Own IPv6 Prefix

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4 min read
ICMPv6 Type by Type: A Reference for What a Firewall Must Allow

ICMPv6 Type by Type: A Reference for What a Firewall Must Allow

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4 min read
IPv6 for Web Servers: Dual-Stack nginx and Apache, and How to Test It

IPv6 for Web Servers: Dual-Stack nginx and Apache, and How to Test It

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4 min read
Dual-Stack Hygiene: Happy Eyeballs, MTU and Path MTU Discovery, and the ICMPv6 You Must Not Filter

Dual-Stack Hygiene: Happy Eyeballs, MTU and Path MTU Discovery, and the ICMPv6 You Must Not Filter

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4 min read
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