Saturday, January 6, 2018

WAN IP address from Ubiquiti EdgeRouter ER-X

I got myself a new router, an Ubiquiti EdgeRouter ER-X , and when I tried to apply my old methods from the WNR2000v5 I discovered that the web pages returned were full of javascript. I could not find any WAN values in the files.

And that was just as well, the edge router features a full OS, with python pre installed! I set it up with eth4 as the WAN port.

The only caveat was the

show interfaces ethernet eth4 brief

did not work in a script. The command

/opt/vyatta/bin/vyatta-op-cmd-wrapper show interfaces ethernet eth4 brief

has to be used for it to work.

So after setting it up to run via crontab with the command

sudo -e crontab
the script were up and running.

The working python script:


import re, os, ftplib, pickle, StringIO

def touch(fname, times=None):
        with open(fname, 'a'):
                        os.utime(fname, times)

cmd_path = '/opt/vyatta/bin/vyatta-op-cmd-wrapper'
cmd_res = os.popen(cmd_path+ ' show interfaces ethernet eth4 brief')
data =

# Edgeos show interface command returns
# eth4
p = re.compile('eth4(\s*)(\d*).(\d*).(\d*).(\d*)')
m =

#m.groups()[0] is white space
if (m and len(m.groups()) == 5):
        current_ip = (m.groups()[1], m.groups()[2], m.groups()[3], m.groups()[4])
                last_ip = pickle.load(open('/home/user/myip/lastip', "rb" ))
        except IOError:
                last_ip = (1,2,3,4)

        if current_ip != last_ip:
                pickle.dump(current_ip,open('/home/user/myip/lastip', "wb" ))
                data ='<html><head><title>My IP</title></head><b>My IP:\
                output = StringIO.StringIO(data)
                ftp = ftplib.FTP('', 'username','password')
                ftp.storlines('STOR index.html', output)

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