I'm using a Cisco VA887 as a modem, and here is the config, which should work with most UK ISPs.

I also used the 887 as a PPPoE router previously and here is my config for that.

My unit has had the fan removed, hence the 'nolog' option for the fan.

To enhance passive cooling, I removed two plastic parts (one of which held the fan) on the fan side, and on the other side I removed the two metal 'sides', which were blocking any cross ventilation. The unit runs a lot cooler now without the fan.

You will also note that the MTU has been set to 1508 for *both* the 'Ethernet0' and 'Vlan1' interfaces. This enables my PPP config to use an MTU of 1500 and prevent fragmentation.

sh run
Building configuration...

Current configuration : 1611 bytes
!
! Last configuration change at 16:21:19 UTC Fri Apr 28 2023
version 15.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot system flash c880data-universalk9-mz.153-3.M.bin
boot-end-marker
!
!
logging discriminator nolog msg-body drops Fan
logging buffered discriminator nolog
logging console discriminator nolog
enable secret 5 
enable password 
!     
no aaa new-model
memory-size iomem 10
!
!
no ip routing
!
!
!
!
!
!
no ip cef
no ipv6 cef
!
!
license udi pid CISCO887VA-K9 sn FCZ153394TL
license boot module c880-data level advsecurity
!
!
!
!
!
!       
!
controller VDSL 0
 operating mode vdsl2
 firmware filename flash:VA_A_39d_B_38h3_24h_1.bin
!
! 
!
!
!
!
!
!
!
!
interface Ethernet0
 mtu 1508
 no ip address
 no ip route-cache
!
interface Ethernet0.101
 encapsulation dot1Q 101
 no ip route-cache
 bridge-group 1      
!
interface ATM0
 no ip address
 no ip route-cache
 shutdown
 no atm ilmi-keepalive
!
interface FastEthernet0
 no ip address
!
interface FastEthernet1
 no ip address
 shutdown
!
interface FastEthernet2
 no ip address
 shutdown
!
interface FastEthernet3
 no ip address
 shutdown
!
interface Vlan1      
 mtu 1508
 no ip address
 ip virtual-reassembly in
 no ip route-cache
 bridge-group 1
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
bridge 1 protocol ieee
!
banner motd ^CSet terminal length 0 to view full config^C
!
line con 0
 no modem enable
line aux 0
line vty 0 4
 password 
 login
 transport input all      
!
!
end

Tags: Networking , Cisco

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