What is the maximum upper limit of ip_conntrack?

16k connections per 1Gb of RAM See sysctl net.netfilter.nf_conntrack_max

What are the commands to search for a subscriber within the ServPoET NOS?

On the command line:
ps x | grep ‘username’
In the rpconfig GUI:
rpconfig®server status®search for ‘username’

Does ServPoET have a built-in SNMP agent? If so, what MIBs are supported?

The MIB is just the standard Linux kernel MIB, SNMP is limited to read-only in the current version, but is under active development to support full read/write.

If VLANs on the PPP interface are created, are any of the PPP Options affected?

When VLANs on the PPP Interface are created, the MTU setting in “Configure PPP Options” both Maximum transfer, and Maximum receive unit need to be no more than 1488, 4 bytes of header created by the VLAN and 8 bytes created for the PPPoE header.

How does ServPoET handle multiple RADIUS servers?

Use the ServPoET configuration GUI (rpconfig) to define multiple RADIUS servers (Realms → Configure RADIUS → Add). If multiple RADIUS servers are specified, they are tried in round-robin fashion if one server is not answering.

How to log ServPoET activity to remote SYSLOG server?

NOTE: logging will reduce system performance.Logging to a remote system, requires that this system runs a SYSLOG daemon. This is easiest done with a remote Linux server, as all such installs run SYSLOG already. Note that your Linux server may need to be configured to accept remote SYSLOG connections. The steps to enable this are Linux distribution/version dependent.

Once the remote SYSLOG server is configured to accept remote logs, you can select the ‘Configure Logging’ in the ServPoET GUI to enable logging to this server.

How to log ServPoET activity to a local file?

NOTE: logging will reduce system performance. vi /etc/syslog.conf
add a single line:
*.* /var/log/message
Save/quit file – command line: wq
And restart syslog
/etc/init.d/syslog restart
And start listening and logging to stdout
tail -f /var/log/message

How do you capture real time PPPoE activity on ServPoET?

NOTE: capturing traffic will reduce system performance.

ServPoET command line can be used to capture Ethernet traffic using the ‘tcpdump’ tool. This tool will capture all packets from a given interface and display them or store them in a file. Refer to tcpdump documentation for further details.

Here are some useful invocations…

show PPPoE discovery packets
# tcpdump -I eth3 pppoed
show PPPoE sessions packets, and filter encapsulated content
# tcpdump -I eth3 pppoes and icmp and host 10.10.10.10
show more detail from PPPoE discovery packets
# tcpdump -vvv -I eth3 pppoed capture PPPoE discovery and session packets into a file for analysis
# tcpdump -I eth3 -w /tmp/pppoe-capture-file pppoed or pppoes

How do you export configuration files from ServPoET?

How do you bypass RADIUS authentication?

In order to bypass RADIUS authentication and to terminate the session locally, follow these steps in the ServPoET GUI (rpconfig):

Select the REALM to edit (Ctrl-R)
Select ‘Realms’ menu option
Select ‘Configure PPP Options’ menu option
Navigate to ‘Additional pppd options…’
Type in ‘noauth’ on its own line
Select OK to accept edit
Select OK to accept changes

How do you preserve changes made to file in /etc.?

The ServPoET NOS accesses the flash media in a read-only manner, except for to update configuration files. The GUI will automatically update the flash media, when a configuration change was made. Should any additional changes be made to the /etc file (like updating ssh keys, or adding custom scripts), these changes will not be automatically preserved and maintained to the next boot. In order to store them to flash run: ‘preserve-etc’.

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