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Marcus Hunold
Beginner

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 *****

 

Rgds

Marcus

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Marcus Hunold
Beginner

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Marcus Hunold
Beginner