可以确定是路由器的问题，思科1921接光猫接的是千兆网，装好后测速只有150兆左右，后来调试在g0/0，g0/1口频繁插拔网线，且没有更改配置，之后再次测速只有40兆了，后来改了MSS为1452，MTU1492速度最多跑到380M，但是上行网速一直都是跑满的100兆，求各位大佬指点。
运营商是联通，以下是配置
Building configuration...
Current configuration : 1452 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname k
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
!
ip cef
no ip dhcp use vrf connected
!
ip dhcp pool k
network 192.168.1.0 255.255.255.0
dns-server 8.8.8.8 114.114.114.114
default-router 192.168.1.254
!
!
!
!
voice-card 0
no dspfarm
!
!
!
!
!
!
!
!
!
!
!
!
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!
!
!
!
!
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!
!
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
!
interface GigabitEthernet0/1
ip address 192.168.1.254 255.255.255.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
interface Dialer1
mtu 1492
bandwidth 10000000
ip address negotiated
ip nat outside
ip virtual-reassembly max-reassemblies 1024
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer idle-timeout 0
dialer hold-queue 100
dialer persistent
dialer-group 1
ppp authentication pap callin
ppp pap sent-username x password 0 x
ppp ipcp route default
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip nat inside source list 10 interface Dialer1 overload
ip nat inside source static 192.168.1.100 interface Dialer1
!
access-list 10 permit 192.168.1.0 0.0.0.255
!
!
!
!
control-plane
!
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!
!
line con 0
line aux 0
line vty 0 4
login
!
scheduler allocate 20000 1000
!
end
