ARP requests for 127.2.0.1

Question

Our GTM (BIG-IP 11.4.1 Build 635.0 HF2) is constantly—several times a second—sending out ARP requests out the mgmt interface for the IP address 127.2.0.1 with a source address of 127.2.0.2. For example:
2014-11-26 11:59:44.543142 00:01:d7:d5:2c:01 -&gt; ff:ff:ff:ff:ff:ff ARP Who has 127.2.0.1?  Tell 127.2.0.2
2014-11-26 11:59:44.543149 00:01:d7:d5:2c:01 -&gt; ff:ff:ff:ff:ff:ff ARP Who has 127.2.0.1?  Tell 127.2.0.2
2014-11-26 11:59:45.543200 00:01:d7:d5:2c:01 -&gt; ff:ff:ff:ff:ff:ff ARP Who has 127.2.0.1?  Tell 127.2.0.2
2014-11-26 11:59:45.543205 00:01:d7:d5:2c:01 -&gt; ff:ff:ff:ff:ff:ff ARP Who has 127.2.0.1?  Tell 127.2.0.2
2014-11-26 11:59:46.543134 00:01:d7:d5:2c:01 -&gt; ff:ff:ff:ff:ff:ff ARP Who has 127.2.0.1?  Tell 127.2.0.2
2014-11-26 11:59:46.543140 00:01:d7:d5:2c:01 -&gt; ff:ff:ff:ff:ff:ff ARP Who has 127.2.0.1?  Tell 127.2.0.2
Does anyone know why this is happening or how I can make it stop?

jason_04_138617 · Answer

Posting to subscribe.&nbsp;

what_lies_bene1 · Answer

127.2.0.2 is a local loopback address;
~  ip a s
1: lo:  mtu 16436 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/24 scope host lo
    inet 127.2.0.2/24 brd 127.2.0.255 scope host lo:1
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever

127.2.0.1 is the 'internal' SCCP IP address;
~  more /root/.ssh/known_hosts 
127.2.0.1,sccp ssh-rsa .....[edited]= SCCP server RSA2 key

So, perhaps your box has lost communication with the switch management subsystem (SCCP) for some reason? You could reset SCCP but this will no doubt lead to traffic loss so perhaps a full system reboot would be better, see here for more information:
"&gt;https://support.f5.com/kb/en-us/solutions/public/3000/400/sol3454.html" target="_blank"&gt;"&gt;https://support.f5.com/kb/en-us/solutions/public/3000/400/sol3454.html

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ARP requests for 127.2.0.1

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