Hundreds of ARP requests of fedora servers

asked 2019-03-03 17:33:57 -0600

Hi! I noticed that whenever my ethernet interface comes up online (because I have it plugged to something, independently of whether it is DHCP or static), my computer starts making hundreds of ARP requests of fedora servers. Here's a tcpdump of the requests : https://pastebin.com/4zjRwPXm I'm using F29 wuth KDE plasma. In the case of this pastebin,the static ip is configured through the NetworkManager GUI addon.

Is it a known issue? I do not really understand why this is or even why anything would event benefit from this. And currently it's just making the debugging of my project even harder because I have to read through those hundreds of ARP requests...

answered 2019-03-04 00:49:19 -0600

villykruse
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I suspect there is something wrong with the routing table of your system. The system should only issue arp requests for local addresses, but somehow it considers the entire internet as a local network. Run ip route and you should get something that looks like

default via 192.168.178.1 dev eth0 proto dhcp metric 100 
192.168.178.0/24 dev eth0 proto kernel scope link src 192.168.178.10 metric 100

Notice the /24 on the second line which specifies what is a local address and what is not. Also the first line tells how to reach the rest of the internet.

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Hi! Thanks for the answer! My routing table is fine though. (Only the default route of my gateway and the subnets of directly attached networks). Also I don't have multiple routing tables. Only one. The rules are also the default ones. Here's my routing table if you still want to check : https://pastebin.com/9NwCQik7 (Sorry it was over the character limit of a comment)

furest ( 2019-03-04 04:07:47 -0600 )edit

They are all connectivity tests for your Ethernet connection. Notice the arp was for the outgoing IP 192.168.1.2 which is the enp4s0f1 interface.

If you uninstall the package NetworkManager-config-connectivity-fedora.noarch your system will no longer perform connectivity tests.

villykruse ( 2019-03-04 05:37:28 -0600 )edit

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