{"record":{"id":"8714bd293e7de859","repo":"XIU2/CloudflareSpeedTest","slug":"failed-to-get-the-preferred-ipv6-address","errorCode":null,"errorMessage":"Failed to get the preferred IPv6 address.","messagePattern":"Failed to get the preferred IPv6 address\\.","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"script/cfst_dnspod.sh","lineNumber":86,"sourceCode":"    # 创建 IPv4 记录\n    new_ipv4_record_id=$(create_dns_record \"A\" \"$preferred_ipv4\")\n    if [ -n \"$new_ipv4_record_id\" ]; then\n      echo \"Created DNSPod record with IPv4: $preferred_ipv4\"\n    else\n      echo \"Failed to create DNSPod record with IPv4.\"\n    fi\n  fi\nfi\n\n# 运行 CFST v6\n./cfst -f ipv6.txt -n 500 -o result6.csv\n\n# 读取 CSV 文件并提取优选 IPv6 地址\npreferred_ipv6=$(awk -F, 'NR==2 {print $1}' result6.csv)\n\n# 检查是否获取到了 IPv6 地址\nif [ -z \"$preferred_ipv6\" ]; then\n  echo \"Failed to get the preferred IPv6 address.\"\nelse\n  echo \"BETTER IPv6: $preferred_ipv6\"\n\n  # 获取 IPv6 记录 ID\n  ipv6_record_id=$(get_record_id \"AAAA\")\n\n  if [ -n \"$ipv6_record_id\" ]; then\n    # 更新 IPv6 记录\n    update_dns_record \"$ipv6_record_id\" \"AAAA\" \"$preferred_ipv6\"\n    echo \"Updated DNSPod record with IPv6: $preferred_ipv6\"\n  else\n    # 创建 IPv6 记录\n    new_ipv6_record_id=$(create_dns_record \"AAAA\" \"$preferred_ipv6\")\n    if [ -n \"$new_ipv6_record_id\" ]; then\n      echo \"Created DNSPod record with IPv6: $preferred_ipv6\"\n    else\n      echo \"Failed to create DNSPod record with IPv6.\"\n    fi","sourceCodeStart":68,"sourceCodeEnd":104,"githubUrl":"https://github.com/XIU2/CloudflareSpeedTest/blob/1da0c025d7b6f9bf0b2b0cf47a547f65430deab2/script/cfst_dnspod.sh#L68-L104","documentation":"The IPv6 mirror of the IPv4 branch: cfst_dnspod.sh runs ./cfst -f ipv6.txt -n 500 -o result6.csv (line 79), reads preferred_ipv6=$(awk -F, 'NR==2 {print $1}' result6.csv) (line 82), and at line 86 prints this message when it is empty, skipping AAAA record lookup/create/update. The script then ends normally.","triggerScenarios":"result6.csv missing because ./cfst -f ipv6.txt never ran (ipv6.txt not in the working directory — the repo ships it at the root, but deployments often copy only ip.txt) or cfst exited early; the host has no IPv6 connectivity so no IPv6 target passes; -n 500 larger than ipv6.txt's entry count; header-only CSV.","commonSituations":"Running on an IPv4-only VPS/home network where every IPv6 test fails; executing from a directory lacking ipv6.txt; the user never intended IPv6 but the script unconditionally attempts it, so the message is expected noise.","solutions":["Confirm ipv6.txt exists next to the script and cfst, then run ./cfst -f ipv6.txt -n 500 -o result6.csv manually to see the real output","If the host has no IPv6 route, treat this as informational or delete the IPv6 block (lines 78-106) — the IPv4 update already completed","Verify IPv6 connectivity: ping -6 2606:4700:4700::1111; relax -n/-t filters if tests fail marginally","Guard the parse: [ -s result6.csv ] && [ $(wc -l < result6.csv) -ge 2 ] || preferred_ipv6=''"],"exampleFix":"# script/cfst_dnspod.sh (before)\npreferred_ipv6=$(awk -F, 'NR==2 {print $1}' result6.csv)\n# (after)\nif [ -f ipv6.txt ] && [ -s result6.csv ] && [ \"$(wc -l < result6.csv)\" -ge 2 ]; then\n  preferred_ipv6=$(awk -F, 'NR==2 {print $1}' result6.csv)\nelse\n  preferred_ipv6=''\nfi","handlingStrategy":"validation","validationCode":"[ -x ./cfst ] && [ -f ipv6.txt ] || { echo 'cfst/ipv6.txt missing' >&2; exit 1; }\nping -c1 -6 2606:4700:4700::1111 >/dev/null 2>&1 || echo 'no IPv6 connectivity — AAAA update will be skipped' >&2","typeGuard":"is_ipv6(){ [[ $1 =~ ^([0-9a-fA-F]{0,4}:){2,7}[0-9a-fA-F]{0,4}$ ]]; }\nis_ipv6 \"$preferred_ipv6\" || echo 'preferred_ipv6 not valid' >&2","tryCatchPattern":null,"preventionTips":["Copy ipv6.txt alongside ip.txt when deploying; the script hardcodes -f ipv6.txt","Check host IPv6 routing before expecting AAAA updates on an IPv4-only box","If IPv6 is unwanted, remove the v6 block (lines 78-106) to silence the recurring message"],"tags":["shell","bash","dnspod","ipv6","dns","empty-result"],"backgroundTag":null,"analyzedSha":"1da0c025d7b6f9bf0b2b0cf47a547f65430deab2","analyzedAt":"2026-08-15T22:22:10.737Z","schemaVersion":2},"datasetVersion":"2026-08-16T03:17:38.424Z"}