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Multilink connection between 1841 routers

I have two HDSL WAN links between two Cisco 1841 routers. The LANs of the remote sites are bridged. Below you find the configurations:

Site A:

!

bridge irb

!

interface Multilink1

ip address 192.168.4.1 255.255.255.0

ppp multilink

ppp multilink group 1

bridge-group 1

!

interface FastEthernet0/0

no ip address

duplex auto

speed auto

bridge-group 1

!

interface Serial0/0/0

bandwidth 2048

no ip address

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface Serial0/1/0

bandwidth 2048

no ip address

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface BVI1

no ip address

!

bridge 1 protocol ieee

!

Site B:

!

bridge irb

!

interface Multilink1

ip address 192.168.4.2 255.255.255.0

ppp multilink

ppp multilink group 1

bridge-group 1

!

interface FastEthernet0/0

no ip address

duplex auto

speed auto

bridge-group 1

!

interface Serial0/0/0

bandwidth 2048

no ip address

encapsulation ppp

no fair-queue

ppp multilink

ppp multilink group 1

!

interface Serial0/1/0

bandwidth 2048

no ip address

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface BVI1

no ip address

!

bridge 1 protocol ieee

!

ping between SiteA and SiteB doesn't work if I use a packet size larger than 1456 bytes.

I would like to allow larger packet to cross multilink connection.

Many thanks

Stefano

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