Wireguard 访问内网只有一半的上行带宽 - V2EX
zer

Wireguard 访问内网只有一半的上行带宽

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  •   zer Jan 6, 2022 4115 views
    This topic created in 1593 days ago, the information mentioned may be changed or developed.

    上海电信千兆,有 100M 的上行带宽

    用 S 访问内外网都能跑满上行带宽,但是用 Wireguard 时,访问外网能到 100M ,访问内网,只有 50M 了。

    本来以为是因为 Wireguard 部署在内网一台服务器,并在路由器上做了端口转发的原因。但最近试了在 OpenWrt 上直接建立 Wireguard server 后,还是这样的内网折半的访问速度。

    不知道有没有解决办法

    5 replies    2022-01-08 20:46:56 +08:00
    swiftg
        1
    swiftg  
       Jan 6, 2022 via iPhone
    mtu 改到低于 1280 试试
    2i2Re2PLMaDnghL
        2
    2i2Re2PLMaDnghL  
       Jan 6, 2022
    画个拓扑?
    你内网链接速度是多少?
    zer
        3
    zer  
    OP
       Jan 6, 2022
    @2i2Re2PLMaDnghL
    内网也是千兆,可以跑满
    没什么拓扑,就是 Openwrt 上跑的 Wireguard 服务

    @swiftg 改成 1280 确实可以了,神奇!
    LGA1150
        4
    LGA1150  
       Jan 7, 2022 via Android
    PPPoE MTU 一般为 1492 ,而 Wireguard MTU 默认 1420 ,overead 80 ,可能导致 IP 分片。
    可以把 Wireguard MTU 改成 1412 试一下,最好抓包确认没有分片报文。
    zer
        5
    zer  
    OP
       Jan 8, 2022
    @LGA1150 我试了下 1280 和 1412 ,只有 1280 确实能有效达到访问内网达成 100M 上传的效果
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