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iOS may have a bug where it advertises N(FRAG_SUP) but fails to reassemble
IKE fragments in IKE_AUTH responses. Switching to fragmentation=no forces
the large IKE_AUTH response to be sent as a single UDP packet with IP-level
fragmentation, which iOS's standard IP stack handles correctly.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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iOS/Android VPN stacks don't follow AIA to download intermediate certs,
so YE1 must be sent by the server for cert chain validation.
The original 1236-byte IKE fragment was being dropped mid-path.
Setting fragment_size=512 splits the 1776-byte IKE_AUTH into ~4
fragments of ≤560 bytes each, which should traverse any NAT/router.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Logs to /home/yyamashita/vpn-logs/charon.log (readable without root)
to diagnose iPhone IKEv2 connection failures.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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fragment_size=0 was interpreted as minimum fragment size (resulting in
4 tiny fragments), not disabled. fragmentation=no in swanctl.conf is
the correct per-connection setting to disable IKE fragmentation entirely.
The server now sends a single large UDP packet; the OS kernel handles
IP fragmentation instead of the IKE layer.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Android (XREAL Beam Pro) fails to reassemble IKE fragments even though
FRAG_SUP is negotiated. IP-level fragmentation (handled by the OS kernel)
works better. Removing the intermediate cert broke macOS/iOS.
This config:
- Sends leaf cert + YE1 intermediate (so any client can verify the chain)
- fragment_size=0 disables IKE fragmentation; the 1776-byte IKE_AUTH
response is sent as one large UDP packet (OS handles IP fragmentation)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- swanctl.conf.tpl: send_cert = always (fix Android cert verification failure)
- docker-compose.yml: mount intermediate CAs to /etc/swanctl/x509ca/
- install.sh: split server.crt into leaf + chain for proper chain distribution
- entrypoint.sh: run charon directly for Docker log visibility,
fix sysctl error handling, fix charon binary path
- strongswan.conf: increase IKE log level to 4 for debugging
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- vpn/: Dockerfile, docker-compose.yml, swanctl.conf.tpl, entrypoint.sh
- install.sh: Caddy 証明書流用 + コンテナ起動
- renew-cert.sh: 証明書更新 + swanctl ホットリロード
- caddy/Caddyfile: vpn.yyamashita.com 追加（Let's Encrypt 証明書取得用）
- post-receive: vpn/deploy.sh を追加
- setup-route53.py: WEB_SUBDOMAINS に vpn を追加
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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