the following allows my branch office router to ping head office resources. I cannot however get a PC sat on the lan interface of the branch office router (currently on ip unnumbered loopback1 10.1.1.1) to ping head office resources. I think due to the limitations of the ip unnumbered interface ad is not being supported on multi access interfaces perhaps??   Building configuration... Current configuration : 2142 bytes ! ! Last configuration change at 16:31:05 UTC Mon Apr 1 2019 ! version 15.5 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ROUTER ! boot-start-marker boot-end-marker ! ! enable secret 5 XXXXXXXXXXXXXXXXXXXXXXXX enable password XXXXXX ! no aaa new-model ethernet lmi ce ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ip cef no ipv6 cef ! ! ! ! ! multilink bundle-name authenticated ! ! ! ! ! ! ! license udi pid C887VA-K9 sn FCZ222610XZ ! ! ! ! ! ! ! controller VDSL 0 ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback1 ip address 10.1.1.1 255.255.255.0 no ip redirects no ip proxy-arp ! interface Loopback2 no ip address ! interface ATM0 no ip address shutdown no atm ilmi-keepalive cdp enable ! interface Ethernet0 bandwidth 40000 no ip address ethernet oam mode passive ethernet oam remote-loopback supported ethernet oam ethernet loopback permit external vlan 101 ! interface Ethernet0.101 encapsulation dot1Q 101 pppoe enable group global pppoe-client dial-pool-number 1 ethernet loopback permit external ! interface FastEthernet0 no ip address shutdown ! interface FastEthernet1 no ip address shutdown ! interface FastEthernet2 no ip address shutdown ! interface FastEthernet3 no ip address ! interface Vlan1 ip unnumbered Loopback1 ! interface Dialer1 description Dialer Interface for MPLS ip unnumbered Loopback1 ip virtual-reassembly in ip virtual-reassembly out encapsulation ppp load-interval 30 dialer pool 1 ppp chap hostname AAXXXXXXXX@adslconnect.bt.com ppp chap password 0 AAXXXXXXX no cdp enable ! ip forward-protocol nd no ip http server no ip http secure-server ! ! ip route 0.0.0.0 0.0.0.0 81.XXX.XXX.XXXX ! ! snmp-server community w3ar3watching RO ! control-plane ! ! ! mgcp behavior rsip-range tgcp-only mgcp behavior comedia-role none mgcp behavior comedia-check-media-src disable mgcp behavior comedia-sdp-force disable ! mgcp profile default ! ! ! ! ! ! ! line con 0 no modem enable line aux 0 line vty 0 4 password XXXXXXXXXXXX login transport input none ! scheduler allocate 20000 1000 ! end ... View more

HI,   Thanks for the reply, I have a config very similar to the one provided but can't help but feel I am missing something. I think the last step is allowing the branch office to utilise the /24 subnet BT have provided to us but I can't see how this is possible when the /24 subnet provided is already bound to the dialler interface?   Perhaps the attached simplified topology diagram helps explains things a little better?     ... View more

Literally all BT Provide us with is the following handover details for each circuit (private info removed).    Company: XXXXXXXXX Installation PSTN: XXXXXX Product: IP Clear Super-fast STANDARDSimultaneous Provision: NO Customer Site Address: XXXXXXX VPN Number: VPNN90XXXX Access ID: FDSL2XXXX Circuit ID: IEUKXXXXXX Bearer ID: BBEUXXXXXXXXXXX Access Technology: FTTC Access Speed/Upstream: 40 MBPS/10 MBPS CoS Model: DSCP EF class of service: 0 Kbits AF class of service: AF1 0 Kbits AF2 0 Kbits AF3 0 Kbits AF4 0 Kbits Promise Date: 01/04/19 PE Router IP: 81.XX.XX.XX Routing Type : STATIC Loop Back IP Address: 10.1.1.1 BGP AS Number: Address Prefix: 10.1.1.0 Mask: 255.255.255.0 Username - XXXXXXXXXXXX@adslconnect.bt.com Password - XXXXXXXXX   This particular MPLS configuration is around 100-150 branch sites which connect back to our internal head office infrastructure over the MPLS network. BT do not host our servers, they simply provide the connectivity back to HQ   The routing configuration is very simple, they just advise us to setup a 0.0.0.0 0.0.0.0 <PE IP>    They are adamant the other 253 addresses are "useable" by the LAN branch network but i really struggle to see how? Even when using IP unnumbered via a Loopback, we can't use the same interface on a dialer interface and a multiaccess interface can we?    BT's have said the following   The DSL and SFBB sites are configured as a /24 network with a loopback address in a static way. For example,   <branch site> SFBB is 10.1.7.0 / 255.255.255.0 with a router loopback of 10.1.7.254 meaning all of 10.1.7.x up to the router is useable. ... View more