Network Devices and Router Logs

Network devices like routers, switches, load balancers, intrusion protection systems, and more can output syslog which you can relay to Loggly. A centralized relay allows you to forward log events outside your local VPN, so you don’t need to open your devices to direct internet access. It also allows TCP for better reliability and TLS for security. It allows you to use the newer RFC 5424 syslog standard with structured data containing your customer token to identify you. Please choose either a Linux or Windows relay and then configure your devices to send to it.

Router Logs

Part 1: Linux Relay

  1. Configure Syslog Daemon
  2. Log into the server you want to use as your local relay. If you haven’t already, run our automatic Configure-Syslog script below to setup rsyslog. Alternatively, you can Manually Configure Rsyslog or Syslog-ng.

    curl -O https://www.loggly.com/install/configure-linux.sh
    sudo bash configure-linux.sh -a SUBDOMAIN -u USERNAME
    

    Replace:

    • SUBDOMAIN: your account subdomain that you created when you signed up for Loggly
    • USERNAME: your Loggly username

  3. Add UDP Input
  4. Create a new UDP configuration file or open your existing one:

    sudo vim /etc/rsyslog.d/22-udp-loggly.conf
    

    Copy and paste this configuration to enable UDP input on the default syslog port 514

    # provides UDP syslog reception
    $ModLoad imudp
    $UDPServerRun 514
    

    Restart rsyslogd so the changes take effect

    sudo service rsyslog restart

  5. Send A Test Event
  6. Try sending a test event to rsyslog using netcat to make sure it’s able to receive UDP messages.

    echo hello | nc -u -w 1 localhost 514

    This message should show up in your system log as well as in Loggly

    tail /var/log/syslog

  7. Configure your Network Device
  8. Go to the next section to configure your network device

Part 1: Windows Relay

  1. Install Nxlog
  2. If you haven’t already, install nxlog on the server you’d like to use as your local relay using this guide.

  3. Add UDP Input
  4. Open your nxlog.conf file in a text editor

    C:\Program Files (x86)\nxlog\conf\nxlog.conf
    

    Copy and paste this configuration to enable UDP input on the default syslog port 514

    <Input udp>
        Module	im_udp
        Port	514
    </Input>
    

    Go down to the bottom of the nxlog file and find the Route directive. Insert the new udp input leaving the other inputs in place. This will route the udp messages to Loggly.

    <Route 1>
        Path udp, internal, file_watch, eventlog => out
    </Route>
    

    Restart nxlog so the changes take effect. You can do this by opening the Services tool from the Start menu, selecting nxlog from the list, and clicking restart.

  5. Configure your Network Device
  6. Go to the next section to configure your network device

Part 2: Configure Your Network Device

  1. Send Logs From Your Device To The Relay
  2. Get the IP address of your local relay and copy it.

    ifconfig eth0

    Refer to your network device’s documentation on how to send log events to a syslog server. Here are a few examples:

    Juniper SRX Firewall / Security Device
    Log into the SRX device, then run the following commands. Replace <relay ip> with the IP of your local relay server.

    configure
    set system syslog host <internal ip> any any
    set system syslog host <internal ip> port 514
    set system syslog host <internal ip> interactive-commands none
    commit
    exit
    

    Arista 7050 10GB Switch
    Log into each switch and run the following commands. Replace <relay ip> with the IP of your local relay server.

    enable
    configure
    logging host <internal ip> protocol udp
    send log level notifications message Your Test Message Here
    

  3. Verify Events
  4. Search Loggly for events from your network device over the past hour. It may take a few minutes to index the events. If it doesn’t work, see the troubleshooting section below.
    Network Devices Logs

Advanced Router and Network Devices Logging Options

Troubleshooting Network Devices and Router Logs

If you don’t see any data show up in the verification step, then check for these common problems.

    Check Your Network Device

  • Wait a few minutes in case indexing needs to catch up
  • Make sure your local aggregator server is receiving UDP messages from your network device using a packet capture look like tcpdump on Linux or Wireshark on Windows
  • Check Your Syslog Daemon:

  • Troubleshooting Rsyslog
  • Still Not Working?

  • Search or post your own router and network device logging question in the community forum.
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