Sep 13

Overture 自 1.5rc4 开始默认使用正则来匹配域名列表,这直接导致运行在路由器上的实例性能骤降。

以 Asus RT-AC68P 为例,在启用 gfwlistdnsmasq-china-list 后,使用默认的 regex-list 匹配方式:

"DomainFile": {
"Primary": "/opt/etc/chinalist",
"Alternative": "/opt/etc/gfwlist",
"Matcher": "regex-list"
}

查询境外网站的时间由几百毫秒(300~800ms)飙升到 1.2 秒,国内网站则因为有 chinaroute 的 IPNetworkFile 规则在先而不受影响。

把 Matcher 改为 "full-map", "suffix-tree", "full-list" (性能影响依次递增)可在单次 dig 查询下缓解这一现象,但是用 D-N-SPerf 做压力测试时,与取消 DomainFile.Matcher 相比,仍然急剧的体现出性能下降,Overture 的每秒查询能力由 300 次骤降到 40 次

所以在路由器上使用 Overture 1.5rc4+ 版本只做解毒用途,而且带机较多的情况下,建议关闭 DomainFile.Matcher,也就是把这两个文件置空。范例:(empty 为空文本文件)

"IPNetworkFile": {
"Primary": "/opt/etc/chinaroute",
"Alternative": "/opt/etc/empty"
},
"DomainFile": {
"Primary": "/opt/etc/empty",
"Alternative": "/opt/etc/empty",
"Matcher": "full-map"
}

2019-09-15 追加,暂时不要用 suffix-tree 匹配模式,有 Bug!无论域名文件是否为空,总会使用主 DNS 查询!

https://github.com/shawn1m/overture/issues/172


Aug 29

ECS (edns-client-subnet)的支持上,国内 DNS派,国外 Google 支持最好,而 Overture 支持上发 EDNS 信息,基于这几个特点,可以在 VPS (无论在国内还是国外)建立一个 CDN 友好的 DNS 服务器。

国外 VPS 配置范例:

{
"BindAddress": ":5353",
"DebugHTTPAddress": "127.0.0.1:5555",
"PrimaryDNS": [
{
"Name": "DNSPaiS",
"Address": "218.30.118.6:53",
"Protocol": "udp",
"SOCKS5Address": "",
"Timeout": 6,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
},
{
"Name": "DNSPaiM",
"Address": "101.226.4.6:53",
"Protocol": "udp",
"SOCKS5Address": "",
"Timeout": 6,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
}
],
"AlternativeDNS": [
{
"Name": "GoogleM",
"Address": "8.8.8.8:53",
"Protocol": "udp",
"SOCKS5Address": "",
"Timeout": 3,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
},
{
"Name": "GoogleS",
"Address": "8.8.4.4:53",
"Protocol": "udp",
"SOCKS5Address": "",
"Timeout": 3,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
}
],
"OnlyPrimaryDNS": false,
"IPv6UseAlternativeDNS": false,
"WhenPrimaryDNSAnswerNoneUse": "PrimaryDNS",
"IPNetworkFile": {
"Primary": "./cn.zone",
"Alternative": "./ip_network_alternative_sample"
},
"DomainFile": {
"Primary": "./domain_primary_sample",
"Alternative": "./domain_alternative_sample",
"Matcher": "regex-list"
},
"HostsFile": "./hosts_sample",
"MinimumTTL": 0,
"DomainTTLFile" : "./domain_ttl_sample",
"CacheSize" : 10000,
"RejectQType": [255]
}

国内/路由器等配置范例:(注意与国外的主要差别,使用了 Google 的 DNS-Over-TLS,否则会被污染)

{
"BindAddress": "0.0.0.0:5554",
"DebugHTTPAddress": "0.0.0.0:8081",
"PrimaryDNS": [
{
"Name": "DNSPaiS",
"Address": "123.125.81.6:53",
"Protocol": "udp",
"SOCKS5Address": "",
"Timeout": 3,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
},
{
"Name": "DNSPaiM",
"Address": "101.226.4.6:53",
"Protocol": "udp",
"SOCKS5Address": "",
"Timeout": 3,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
}
],
"AlternativeDNS": [
{
"Name": "GoogleM",
"Address": "dns.google:853@8.8.8.8",
"Protocol": "tcp-tls",
"SOCKS5Address": "",
"Timeout": 6,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
},
{
"Name": "GoogleS",
"Address": "dns.google:853@8.8.4.4",
"Protocol": "tcp-tls",
"SOCKS5Address": "",
"Timeout": 6,
"EDNSClientSubnet": {
"Policy": "auto",
"ExternalIP": "223.73.56.110",
"NoCookie": true
}
}
],
"OnlyPrimaryDNS": false,
"IPv6UseAlternativeDNS": false,
"WhenPrimaryDNSAnswerNoneUse": "AlternativeDNS",
"IPNetworkFile": {
"Primary": "/opt/etc/cn.zone",
"Alternative": "/opt/etc/empty"
},
"DomainFile": {
"Primary": "/opt/etc/empty",
"Alternative": "/opt/etc/empty"
},
"HostsFile": "",
"MinimumTTL": 300,
"DomainTTLFile" : "/opt/etc/domain_ttl.txt",
"CacheSize" : 8192,
"RejectQtype": [255]
}

:cool: :cool: :cool: