v2ray 服务端 dns 解析失败

[afxMetoo]

v2ray-core 版本 v4.44.0

服务器环境:
ubuntu 18.04.6 LTS

服务器配置:
{
"log": {
"access": "/var/log/v2ray/access.log",
"error": "/var/log/v2ray/error.log",
"loglevel": "debug"
},
"inbounds": [
{
"port": 3,
"protocol": "vmess",
"settings": {
"clients": [
{
"id": "",
"level": 1,
"alterId":0
}
]
},
"streamSettings": {
"network": "ws"
},
"sniffing": {
"enabled": true,
"destOverride": [
"http",
"tls"
]
}
}
//include_ss
//include_socks
//include_mtproto
//include_in_config
//
],
"outbounds": [
{
"protocol": "freedom",
"settings": {
"domainStrategy": "UseIP"
},
"tag": "direct"
},
{
"protocol": "blackhole",
"settings": {},
"tag": "blocked"
},
{
"protocol": "mtproto",
"settings": {},
"tag": "tg-out"
}
//include_out_config
//
],
"dns": {
"servers": [
"https+local://1.1.1.1/dns-query",
"8.8.8.8",
"108.61.10.10",
"8.8.4.4",
"1.1.1.1",
"1.0.0.1",
"localhost"
]
},
"routing": {
"domainStrategy": "IPOnDemand",
"rules": [
{
"type": "field",
"ip": [
"0.0.0.0/8",
"10.0.0.0/8",
"100.64.0.0/10",
"127.0.0.0/8",
"169.254.0.0/16",
"172.16.0.0/12",
"192.0.0.0/24",
"192.0.2.0/24",
"192.168.0.0/16",
"198.18.0.0/15",
"198.51.100.0/24",
"203.0.113.0/24",
"::1/128",
"fc00::/7",
"fe80::/10"
],
"outboundTag": "blocked"
},
{
"type": "field",
"inboundTag": ["tg-in"],
"outboundTag": "tg-out"
}
,
{
"type": "field",
"domain": [
"domain:epochtimes.com",
"domain:epochtimes.com.tw",
"domain:epochtimes.fr",
"domain:epochtimes.de",
"domain:epochtimes.jp",
"domain:epochtimes.ru",
"domain:epochtimes.co.il",
"domain:epochtimes.co.kr",
"domain:epochtimes-romania.com",
"domain:erabaru.net",
"domain:lagranepoca.com",
"domain:theepochtimes.com",
"domain:ntdtv.com",
"domain:ntd.tv",
"domain:ntdtv-dc.com",
"domain:ntdtv.com.tw",
"domain:minghui.org",
"domain:renminbao.com",
"domain:dafahao.com",
"domain:dongtaiwang.com",
"domain:falundafa.org",
"domain:wujieliulan.com",
"domain:ninecommentaries.com",
"domain:shenyun.com"
],
"outboundTag": "blocked"
} ,
{
"type": "field",
"protocol": [
"bittorrent"
],
"outboundTag": "blocked"
}
//include_ban_ad
//include_rules
//
]
},
"transport": {
"kcpSettings": {
"uplinkCapacity": 100,
"downlinkCapacity": 100,
"congestion": true
}
}
}

现象:
一天当中随机时间会出现无法访问 www.google.com 或者其它需要翻墙的网站。有时候的现象是google无法访问，但是此时打开youtube又有可能是正常的，持续一段随机的时间后又能恢复访问。

已经做出的尝试:
1、当任意访问失败时，重启v2ray 服务，此时绝大多数情况是恢复正常访问外网的功能。
2、访问失败时，登录服务器查看v2ray 日志，发现: 正常情况下,DOHL 返回的地址格式为: [常见的ip地址 + 一串冒号连接的字符]
当发生无法访问外网时，服务器的日志显示DOHL 解析出来的地址格式跟上述格式不同，只返回了 一串冒号连接的字符

如: 正常时:DOHL//1.1.1.1 cache HIT www.google.com -> [142.251.42.196 2404:6800:4004:827::2004]

异常时:DOHL//1.1.1.1 cache HIT www.google.com -> [2404:6800:4004:824::2004]

后面的提示为 dialing [2404:6800:4004:824::2004] 然后就失败了。

服务器的时间跟本地时间一致。

不知道大家有没有遇到过这种问题，又是怎么解决的。

[afxMetoo]

从想象和测试结果看，本人猜测是使用ipv6去访问目标网站失败导致的连接不稳定。修改方案为将服务器上的配置文件中的
"outbounds":
{
"protocol": "freedom",
"settings": {
"domainStrategy": "UseIPv4"
}
}
将domainStrategy 设置为使用ipv4. 从发起讨论到现在一直稳定运行，没修改前按照正常的使用频率相同的时间内已经遇到数次上述提到的问题，目测问题即使没解决也至少极大程度上缓解了。