This page was exported from Free Cisco Training & Resources - Certification Exam Preparation [ https://www.ciscobibles.com ] Export date:Wed Mar 12 20:27:53 2025 / +0000 GMT ___________________________________________________ Title: Cisco ASA Firewall with PPPoE --------------------------------------------------- Cisco ASA Firewall is ideal for Broadband access connectivity to the Internet since it provides state of the art and solid network security protection. Especially for small business or home use, the ASA 5505 model is ideal for broadband ADSL access connectivity. Some ISPs provide Point to Point over Ethernet access, which is abbreviated as PPPoE. Cisco ASA 5500 series support the PPPoE protocol as we can see below. On the Figure above we assume the following: The Internal IP address range is 192.168.1.0 /24 There is a modem in front of the Firewall connected to the ISP The ISP provides a public address to the ASA via PPPoE The ASA connects to the modem with Ethernet 0/0 (E0/0) The ASA connects to the internal network with Ethernet 0/1 (E0/1) There is NAT performed on the ASA to translate internal private addresses to the ISP Provided public address The ASA acts as a DHCP server to provide 32 addresses to the internal hosts. Here is the sample configuration: ———————————————————————————– ASA Version 7.2(2) ! hostname ciscoasa domain-name default.domain.invalid enable password * encrypted names ! interface Vlan1 nameif inside security-level 100 ip address 192.168.1.254 255.255.255.0 ! interface Vlan2 nameif outside security-level 0 pppoe client vpdn group ATT ip address pppoe setroute ! interface Ethernet0/0 switchport access vlan 2 ! interface Ethernet0/1 ! interface Ethernet0/2 ! interface Ethernet0/3 ! interface Ethernet0/4 ! interface Ethernet0/5 ! interface Ethernet0/6 ! interface Ethernet0/7 ! passwd * encrypted ftp mode passive dns server-group DefaultDNS domain-name default.domain.invalid access-list inside_access_out extended permit ip any any pager lines 24 logging enable logging asdm informational mtu inside 1500 mtu outside 1492 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-522.bin no asdm history enable arp timeout 14400 global (outside) 1 interface nat (inside) 1 0.0.0.0 0.0.0.0 access-group inside_access_out in interface inside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute http server enable http 192.168.1.0 255.255.255.0 inside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart telnet timeout 5 ssh timeout 5 console timeout 0 vpdn group ATT request dialout pppoe vpdn group ATT localname [ENTER ISP USERNAME HERE] vpdn group ATT ppp authentication chap [or PAP, depends on your ISP settings] vpdn username [ENTER ISP USERNAME HERE] password [ENTER ISP PASSWORD HERE] dhcpd auto_config outside ! dhcpd address 192.168.1.1-192.168.1.32 inside dhcpd dns [ENTER ISP DNS ADDRESS HERE] interface inside dhcpd enable inside ! ! class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect esmtp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp ————————————————————————————- Take care to configure the Outside MTU to 1492 since there is an extra 8-bytes overhead used by PPPoE. Source from: http://www.cisco-tips.com/cisco-asa-firewall-with-pppoe/ --------------------------------------------------- Images: http://www.cisco-tips.com/images/cisco-asa-pppoe.jpg --------------------------------------------------- --------------------------------------------------- Post date: 2009-05-04 12:01:05 Post date GMT: 2009-05-04 04:01:05 Post modified date: 2010-07-23 11:50:40 Post modified date GMT: 2010-07-23 03:50:40 ____________________________________________________________________________________________ Export of Post and Page as text file has been powered by [ Universal Post Manager ] plugin from www.gconverters.com