PPPoE Interface Configuration Guide

introduction introduction pppoe(point to point protocol over ethernet) is an ethernet based wan access protocol defined by rfc 2516 it combines the authentication, accounting, and link control functions of the ppp(point to point protocol) with the flexible networking features of the ethernet it is mainly used to establish point to point logical connections in a shared ethernet environment explanation of principles explanation of principles pppoe connection establishment is divided into two phases discovery phase discovery phase the discovery phase is completed by the following packets 1 padi(pppoe active discovery initiation)\ the client broadcasts a padi packet to find an available pppoe server 2 pado(pppoe active discovery offer)\ the server responds to the pado message, indicating that the service is available 3 padr(pppoe active discovery request)\ the client selects the server and sends a padr request 4 pads(pppoe active discovery session confirmation)\ the server assigns the session id to confirm the session establishment session phase session phase 1 based on the ppp protocol, lcp(link control protocol) negotiation is completed, authentication packet(chap) authentication, and ipcp(ip control protocol) completes ip address assignment pppoe session termination phase session termination phase session termination phase 1 padt(pppoe active discovery terminate)\ this parameter is generated by a client or server to notify the peer to release pppoe session resources pppoe client configuration pppoe client configuration dial interface configuration dial interface configuration create a logical interface for a pppoe client to centrally manage ppp parameters and bind physical interfaces operation command description enter the system configuration view configure create a dialer interface interface dialer id id is dialer id ppp authentication user name and password configuration ppp authentication user name and password configuration configure authentication management the pppoe server can use this information to verify the client validity ensure that the user name and password are the same as those configured on the pppoe server operation command description enter the dialer interface configuration view interface dialer \<dialer id> configure the ppp authentication user name and password ppp chap username username password mtu configuration mtu configuration pppoe encapsulation consumes 8 bytes (6 bytes pppoe header + 2 bytes ppp protocol number) to avoid fragmentation and increase the risk of packet loss, flexible adjustment is required in addition, ensure that the end to end mtu is consistent operation command description enter the dialer interface configuration view interface dialer \<dialer id> configure mtu mtu mtu the value of mtu,the default value is 1492 nat configuration nat configuration to enable intranet devices to access the internet through pppoe public ip addresses, the nat(network address translation) is required operation command description enter the dialer interface configuration view interface dialer \<dialer id> configure nat zone nat zone id port binding configuration port binding configuration associate a physical interface with a dialer interface to enable pppoe traffic to be transmitted over a specified physical link operation command description enter the interface view interface ethernet id configure binding a pppoe client pppoe client id the id here is the id of a dialer interface pppoe server configuration pppoe server configuration pppoe server is used to provide layer 2 discovery (padi/pado) and layer 3 session capabilities for pppoe clients in the access network through username/password authentication, it dynamically assigns network parameters such as ip addresses and dns to clients, and supports large scale concurrent session control on the sonic device, pppoe server is usually deployed on the physical port or sub interface, which carries the terminal or access server downward, and accesses the internet through the three layer gateway or nat outlet upward pppoe server interface configuration create a logical interface for a pppoe client to centrally manage ppp parameters and bind physical interfaces operation command description enter the system configuration view configure create a dialer interface interface pppoe server id the id configuration range is from 0 to 7 ac name configuration ac name configuration create the access concentrator name for the pppoe server, which will be carried in the pado message as an optional field operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure access concentrator name ac name string the range of string configuration is 1 63 dns server configuration dns server configuration configure the dns ip sent by the pppoe server to the client as an optional field operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure the dns server ip provided by the server to the client dns server a b c d the range of string configuration is 1 63 service type configuration service type configuration configure the service name of the pppoe server and include this field in the pado message; simultaneously supports two switches, one for specifying the acceptance of any service type from the client, and a total of for specifying the allowed service types for the client to be empty this field is optional operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure the service type of the server service name string specify service name enable allowing all types of services on the client side accept any service enable allow/cancel enable enable allowing client service type to be empty accept blank service enable allow/cancel enable keepalive configuration keepalive configuration configure the keep alive interval on the pppoe server side if the retry count is exceeded, the dead connection will be disconnected this field is optional operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure the keep alive interval of the server keepalive interval interval the configuration range is 0 65535 local ip configuration local ip configuration configure the local ip address of the pppoe server, which is the layer 3 address used to establish ppp connections, and be careful not to conflict with the remote ip pool operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure the local ip address of the server local ip a b c d v4/v6 mask configuration example local ip 192 168 3 1 255 255 255 0 mru configuration mru configuration configure the maximum receiving unit on the pppoe server side, which defaults to 1492 the final receiving unit size will be negotiated with the mru value on the client side the final mtu value can be viewed on the ppp interface through the ifconfig command to determine the negotiation result note that the mtu value on the server side is determined entirely based on the mru negotiation results, otherwise the default value of 1492 will be used this field is optional operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure the mru of the server mru value value configuration range 1312 10218 remote ip pool configuration remote ip pool configuration configure the pppoe server to provide users with an address pool for dial up authentication addresses, specifying pre configured ip ports that support both range and mask configuration methods operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure the address pool provided by the server for the client remote ip pool string string the configuration range is 1 32 in the system configuration view, configure ip pool ip pool string string the configuration range is 1 32 enter the ip pool configuration view ip mask ip address ip address supports configuring a b c d/mask or a b/mask enter the ip pool configuration view ip range start ip end ip start ip, end ip both support configuring a b c d/a/b session max configuration session max configuration configure pppoe server side to support the maximum number of dial up authentication sessions established for clients this field is optional operation command description enter the pppoe server interface configuration view interface pppoe server id the id configuration range is from 0 to 7 configure the maximum number of dial up authentication sessions that the server can establish for clients session max value value the configuration range is 1 65535 example of pppoe client configuration example of pppoe client configuration network requirements when a pppoe server connects to the device, set an authentication user name and password on the server the device has been configured with a pppoe client and correctly obtained an ip address from the server address pool, and can access the internet procedure 1 create dialer interface 1 sonic(config)# interface dialer 1 2 configure the same user name and password as the pppoe server sonic(config dialerif 1)# ppp chap username test1 123abc 3 configure mtu sonic(config dialerif 1)# mtu 1492 4 configure the port binds the dialer interface sonic(config dialerif 1)# exit sonic(config)# interface ethernet 1 sonic(config if 1)# pppoe client 1 verify configuration the device interface has been successfully assigned to the ip address in the pppoe server address pool, after the default route is configured, the device can access the internet example of pppoe server configuration example of pppoe server configuration network requirements the pppoe client accesses the sonic device through the two layer ethernet the device, as the pppoe server, provides user authentication, session establishment and address allocation capabilities the client successfully obtains the address pool ip and accesses the upstream network or internet through the device procedure 1 configure ip pool and configure pppoe server interface sonic(config)# ip pool pppoe pool1 sonic(config ippool pppoe pool1)# ip range 192 168 15 10 192 168 15 20 sonic(config)# interface pppoe server 1 2 configure ip pool and configure pppoe server interface sonic(config if pppoeserver 1)# ppp chap username test1 test1 3 configure the address pool for client ip allocation sonic(config if pppoeserver 1)# remote ip pool pppoe pool1 4 configure the local ip address of the server sonic(config if pppoeserver 1)# local ip 192 168 15 1 255 255 255 0 5 configure other server parameters sonic(config if pppoeserver 1)# dns server 8 8 8 8 sonic(config if pppoeserver 1)# ac name pppoe server 1 sonic(config if pppoeserver 1)# keepalive 15 sonic(config if pppoeserver 1)# mru 1400 sonic(config if pppoeserver 1)# service name test sonic(config if pppoeserver 1)# session max 300 6 port binding pppoe server interface sonic(config)# interface ethernet 2 sonic(config if 2)# pppoe server 1 verify configuration the pc can successfully obtain the ip address in the remote ip pool through dial up authentication of the pppoe server service provided by the device as the server, the device can view the relevant statistics and session establishment status corresponding to each server interface