MTR, Path MTU, and SNI Block Detection on iOS Without Entitlements
Summary
This article explains how an iOS app called NetDiag+ performs advanced network diagnostics without special entitlements. It covers MTR and traceroute-style probing, Path MTU discovery, and SNI-based site reach checks using TCP and TLS. The post also shows how the app detects ICMP responses, calculates RTT statistics, and handles UDP and TLS-based testing on iOS. It highlights support for DNS, STUN, Bonjour, HTTP/3, and IPv6-related checks within the same tool.
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Apple Inc.
$1B+