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Static NAT and PAT (port forwarding) NOTE: This particular config was done on a Cisco 877 ADSL / DSL router however its known to work on the Cisco 800 series routers in general including the Cisco 827 Cisco 837 Cisco 877W the Cisco 1720 Cisco 1721 Cisco 1750 series and the CIsco 1600 series Right so you have setup your Cisco DSL (or you only have one IP address from your ISP) and you have setup your DynDNS so that you can connect to the router. But now you what’s next? Well the usual next step, and probably the whole reason you did this in the first place is so that you can connect to the server from the outside world for a web server or a mail server. or some thing similar. The basic principal is that the connection is made in from the dialer interface (the external address) and passed to the internal address on a matching port. There is a limitation to this though, if you have two web servers both listing for traffic on port 80 but only one external address you are going to run into ...

Any new Cisco ADSL router in the 800 series should support dynamic DNS updates to a DDNS provider like DynDNS.com This particular example is for a Cisco 877 ADSL router. NOTE: This particular config was done on a Cisco 877 ADSL / DSL router however its known to work on the Cisco 800 series DSL routers in general including the Cisco 827 Cisco 837 Cisco 877W as long as your Cisco IOS on the router supports the DDNS config You might want to check the Cisco ADSL config guide too . First off you are going to want to create an account with a DDNS Provider, this particular example uses DynDNS.org but others should work in the same way or at least in a similar way. In this example the dns name we want is mycisco.dyndns.org OK lets go Login to you router via console or telnet Go into Enable mode Then configure terminal (conf t) ip domain name dyndns.org ip name-server ip.ip.ip.ip ip name-server ip.ip.ip.ip ip ddns update method DynDNS HTTP add http://uname:passwd@members.dyndns.org/nic/u...

Assigning STATIC IP addresses on a Cisco Router via DHCP Although it’s not something that is probably all that common, and it’s actually the first time I have had a need to use this on a router, I thought I would share this information with you anyway NOTE: This particular config was done on a Cisco 877 ADSL / DSL router however its known to work on the Cisco 800 series routers in general including the Cisco 827 Cisco 837 Cisco 877W the Cisco 1720 Cisco 1721 Cisco 1750 series and the CIsco 1600 series Normal DHCP config for a Cisco Router ip dhcp excluded-address 192.168.1.1 192.168.1.10 We are excluding anything in the range between 192.168.1.1 to 1.10 In this example our servers are in this range and we don’t want any conflicts, also the router is .1 ip dhcp pool POOL-NAME network 192.168.1.0 255.255.255.0 dns-server 192.168.1.7 192.168.1.8 default-router 192.168.1.1 lease 0 8 The pool name is exactly that a name it will mean more to you than to the router so make it something yo...

Tacacs+ Install and Config Guide What is TACACS As per wikipedia Terminal access controller access control system (TACACS) is a remote authentication protocol that is used to communicate with an authentication server commonly used in UNIX networks. TACACS allows a remote access server to communicate with an authentication server in order to determine if the user has access to the network. Installing Tacacs on FreeBSD This guide is intended to be a basic implementation of TACACS+, so although there are may features I am just going to document what I generally use. Please note that tac_plus is also available from Shrubbery Networks if you would like to install and configure on another platform. You may also want to check out my Rancid How-To Once again its in your ports directory. cd to /usr/ports/net/tac_plus4/ run a "make install clean" Once installed vi /usr/local/etc/rc.d/tac_plus.sh Then Change the following line from NO to YES tac_plus_enable=$ Save the file, then vi /e...

Setting up and Installing Rancid on FreeBSD for Cisco Products What is Rancid? Rancid is an application that monitors a devices configuration including software and hardware. The configuration is then stored in a Concurrent Version System or CVS. Most of the time it is used to back up router, switch and firewall configurations, as well as notify you when a configuration has changed, i.e a firewall rule or a routers IP address or access list change. here is an example of the output =================================================================== retrieving revision 1.29 diff -u -4 -r1.29 mpls-jhb-pe1 @@ -288,9 +288,9 @@ ! interface Serial0/0 description Link to Client X bandwidth 2048 - ip address 192.168.1.244 255.255.255.254 + ip address 192.168.1.234 255.255.255.254 ip route-cache flow ip tcp header-compression iphc-format ip tcp compression-connections 256 ! ip ospf message-digest-key 1 md5 the - symbol represents what was removed the + symbol represents what was added The abo...

Setting up a Cisco 800 series Router for ADSL Not that the Average user would use a Cisco ADSL router, or if they do use a Cisco product it would probably be a Linksys router. Anyway here is the config with comments in between. all comments are in italics You might want to check out the Cisco DYNDNS configuration guide too NOTE: This particular config was done on a Cisco 877 ADSL / DSL router however its known to work on the Cisco 800 series DSL routers in general including the Cisco 827 Cisco 837 Cisco 877W This example is a basic setup for just access to the web you can enable PAT or Port Address Translation on the router to allow access from the outside to a server or something like that. Also this setup is for a Dynamic IP from the ISP you might also want to checko out the how to on setting up SSH login on the router no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname # your router name i.e. Bobs Router ! boot-st...