ISR4300 PPPoE/dialer mtu size always overwritten/set to 1500
with the configuration below the mtu is configured to 1484 and can be verified with show interface.
(1484 is the maximum mtu size for this internet connection)
When a reload or a "clear pppoe all" is done then the router configuration changes to 1500.
This is not a wanted behaviour and causes connection issues.
Is that a bug? Hints are welcome :)
IOS Version: isr4300-universalk9.16.06.04.SPA.bin
interface GigabitEthernet0/0/0 description ISP no ip address no ip redirects no ip proxy-arp negotiation auto pppoe enable group global no cdp enable pppoe-client dial-pool-number 1 ip virtual-reassembly
interface Dialer0 description PPPoE - Modem mtu 1484 ip address negotiated no ip redirects no ip unreachables no ip proxy-arp ip nat outside encapsulation ppp ip tcp adjust-mss 1444 dialer pool 1 dialer-group 1 no cdp enable ppp authentication chap callin ppp chap hostname ***** ppp chap password *****
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