Configuration: Dents on the POP Y Router

• Network Diagram
• Starting Dents and Debugging
• Configuration Files
• Notes on Commands

Starting Dents and Debugging

Configuration of Dents is as for POP X with this /etc/dents.xml and these zone files: /var/named/named.local, /var/named/192.168.193.db and /var/named/named.ca.

When starting dents for the first time it is best to instruct Dents not to detach from the terminal. This is done using the -n option. "-c /etc/dents.xml" instructs dents to use /etc/dents.xml as the configuration file.

$ dents -n -c /etc/dents.xml
dents[11147]: dents v0.4.0pre1.ss.1
directory /var/named
listen-on
dents_mod_supersparrow[11147]: mod_supersparrow_init version 0.0.0
Copyright Horms

dents_mod_supersparrow[11147]: cache_timeout=10, cache_size=16, debug=1,
host="localhost", peer="64700=192.168.192.13,64702=192.168.193.11",
port="616", password="frub", no_lookup=0, route_server="gated",
result_count=3, self==192.168.193.11, timeout=60, verbose=1 
ÿûPassword? 
ü100 Gated Interactive Interface. Version gated-public-3_6

The output shows that mod_supersparrow was initialised and shows all the the options available options to this module, and their values. It also shows that the module was able to access the Gated route server and there are no authentication errors. If you get a login: Password verification failed message then you need to set the password for gii.

Please see the notes on mod_supersparrow and supersparrow logging to ensure that messages are logged to syslog correctly.

By sending a DNS query to Dents for a host in the fictitious test.supersparrow domain that is handled by mod_supersparrow the configuration can be tested.

$ nslookup www.test.supersparrow 127.0.0.1
Server:  localhost
Address:  127.0.0.1

Name:    www.test.supersparrow
Address:  192.168.193.11

In the terminal that dents is connected to, as it was run with the -n option, output should be displayed showing that mod_supersparrow queried the route server.

GateD-roger> 100 Dir       127.0.0.1/32 127.0.0.1       IGP (Id 1)
100 Sta             127/8  127.0.0.1       IGP (Id 1)

This shows that the source address for the query was 127.0.0.1. This is because nslookup connected directly to dents on the loopback interface to make a query to the server 127.0.0.1. One prefix was found for this address, a directly connected route as indicated by Dir. This prefix has no AS path and hence, does not match the the AS number of any of the configured peers so the IP address specified by the self option, 192.168.193.11, is used. This is returned to the client.

For more information on verifying the Dents setup and information on configuring Dents to start on system boot, please see the corresponding documentation for POP X

Configuration Files

POP X Router: /etc/dents.xml, /var/named/192.168.192.db, /var/named/named.ca, /var/named/named.local.

A complete set of configuration files for this network setup can be found here.

Notes on Commands

$ echo flim
flim