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xmz7891
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琚帶绔?- 淇 MTU 闂锛氬す MSS + 璺緞 MTU 鎺㈡祴锛堝叕缃戝彲鐢ㄧ巼 48% -> 100%锛?- 澶嶇敤 HTTP 杩炴帴锛堝厤鎺夋瘡娆℃柊寤?TLS 鐨?30% 鎻℃墜澶辫触锛?- 姣忓垎閽熷洖澶存壘灞€鍩熺綉锛岃嚜鍔ㄥ垏鍥炲揩 400 鍊嶇殑璺緞 - 鐢婚潰蹇冭烦甯э細闈欐鏃剁渷娴侀噺锛屽鎴风浠嶇煡閬撴祦鏄椿鐨?- 閿佸睆鏃剁粰鍑哄彲鎿嶄綔鐨勬彁绀? 鎵嬭〃绔?- 鍐呯疆 GTS Root R4 / GlobalSign Root CA锛屼慨 SSLHandshakeException - 杩炴帴閿欒缈昏瘧鎴愪汉璇濓紙璇佷功/鏃堕棿/瑙ｆ瀽/瓒呮椂鍒嗗埆鎻愮ず锛?- 缁忎腑杞繛涓婂悗鐢ㄦ湇鍔″櫒鎶ョ殑鍦板潃鍒锋柊宸查厤瀵硅褰?- 鏂板灞€鍩熺綉杩炴帴椤甸潰銆佹湇鍔″櫒寤惰繜妫€娴? 鏈嶅姟鍣ㄧ - 鏀寔 chunked 璇锋眰浣擄紙淇瘡 16 绉掍竴娆＄殑杩炴帴閿欎贡涓庡ぇ闈㈢Н 502锛?- 缃戠粶璋冧紭鑴氭湰 net-tune.sh锛堝紑鏈鸿嚜鍔ㄥ簲鐢級 - 绠＄悊椤碉細鎵归噺鍒犻櫎銆佺綉缁滀綋妫€銆佷笅杞藉尯 - 闅ч亾鏀?HTTP/2 + 鍙岃繛鎺? 鏂囨。 - 璁稿彲鍗忚 / 瀹夎鍓嶅繀璇?/ 瀹夎鍚庨』鐭ワ紙浣滆€咃細灏忛害瀛愶級
71 lines
2.8 KiB
Bash
71 lines
2.8 KiB
Bash
#!/bin/bash
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# 关键假设验证：是不是 MTU / 分片问题？
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#
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# 线索：
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# * 新建 TLS 连接约 30% 失败，但连接一旦建好就 100% 成功
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# * 到 1.1.1.1 丢包 40%
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# -> 很像**大包被丢、小包能过**：TLS 握手要发大证书包才失败，
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# 建好之后数据包小就没事。
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#
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# 如果真是 MTU 问题，把 MSS 夹到合适值就能大幅改善 —— 这是能落地的修复。
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set -u
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EDGE=198.41.192.107
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echo "===== 1. 本机网卡 MTU ====="
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ip link show 2>/dev/null | grep -E '^[0-9]+:' -A1 | grep -E 'mtu' \
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| sed 's/^/ /'
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echo " 默认路由："
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ip route get 1.1.1.1 2>/dev/null | head -2 | sed 's/^/ /'
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echo
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echo "===== 2. 逐步加大 ping 包，找不丢包的最大值（到 1.1.1.1）====="
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for size in 1400 1420 1440 1452 1460 1472 1473 1500; do
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out=$(ping -c 3 -W 3 -M do -s "$size" 1.1.1.1 2>&1)
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loss=$(echo "$out" | grep -oE '[0-9]+% packet loss' | head -1)
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err=$(echo "$out" | grep -oiE 'frag needed|Message too long|Invalid argument' | head -1)
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printf " payload %-5s (包大小 %-5s) 丢包 %-12s %s\n" \
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"$size" "$((size + 28))" "${loss:-?}" "${err:-}"
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done
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echo
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echo "===== 3. 同样测到 Cloudflare 边缘 $EDGE ====="
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for size in 1200 1300 1400 1452 1460 1472; do
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out=$(ping -c 3 -W 3 -M do -s "$size" "$EDGE" 2>&1)
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loss=$(echo "$out" | grep -oE '[0-9]+% packet loss' | head -1)
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err=$(echo "$out" | grep -oiE 'frag needed|Message too long' | head -1)
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printf " payload %-5s (包大小 %-5s) 丢包 %-12s %s\n" \
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"$size" "$((size + 28))" "${loss:-?}" "${err:-}"
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done
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echo
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echo "===== 4. 当前 MSS / 分片相关设置 ====="
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echo " iptables MSS 规则："
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iptables -t mangle -L -n 2>/dev/null | grep -i mss | sed 's/^/ /' \
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|| echo " （没有）"
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echo " /proc/sys/net/ipv4/tcp_mtu_probing = $(cat /proc/sys/net/ipv4/tcp_mtu_probing 2>/dev/null)"
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echo " /proc/sys/net/ipv4/tcp_base_mss = $(cat /proc/sys/net/ipv4/tcp_base_mss 2>/dev/null)"
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echo " /proc/sys/net/ipv4/tcp_window_scaling = $(cat /proc/sys/net/ipv4/tcp_window_scaling 2>/dev/null)"
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echo
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echo "===== 5. 到边缘的实际 TCP 握手成功率（20 次）====="
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ok=0
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for i in $(seq 1 20); do
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timeout 4 bash -c "exec 3<>/dev/tcp/$EDGE/7844" 2>/dev/null && ok=$((ok+1))
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done
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echo " TCP 7844 握手 $ok/20"
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echo
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echo "===== 6. 到大站的 HTTPS 握手成功率（20 次，看证书大包）====="
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ok=0
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for i in $(seq 1 20); do
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timeout 10 curl -4 -s -o /dev/null https://www.cloudflare.com/cdn-cgi/trace \
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2>/dev/null && ok=$((ok+1))
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done
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echo " HTTPS 握手 $ok/20"
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echo
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echo "===== 结论 ====="
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echo " 如果小包通、大包不通（或丢包率随包大小骤增）-> 就是 MTU 问题，"
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echo " 夹 MSS 就能修。如果各尺寸都差不多 -> 是链路整体丢包，夹 MSS 没用。"
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