ARP filter

Issues related to configuring your network
thammr
Posts: 5
Joined: 2014/04/29 04:04:38

ARP filter

Postby thammr » 2017/11/20 05:38:35

When I search for ARP Flux on the Internet, I am informed that Linux considers its IP addresses to be host addresses and not specifically tied to an interface card. Consequently all interfaces respond to an ARP request for any of a hosts IP addresses unless arp filtering is enabled.

I have a device on my network that appears to have arp filtering disabled and is causing problems for my network mapping software.

However, my Centos 7 box does not exhibit this behavior and I don't understand why.

1) /proc/sys/net/ipv4/conf/*/arp_filter all contain 0
2) arptables is not a recognized command.

Does anyone know how arp filtering is enabled?

I don't want to disable arp filtering on my CentOS box, I just want to understand why it behaves differently than the problematic device.

The version is 3.10.0-327.36.3.el7.x86_64

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TrevorH
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Re: ARP filter

Postby TrevorH » 2017/11/20 07:31:24

The version is 3.10.0-327.36.3.el7.x86_64


No idea about your question but that is a 7.1 kernel and 7.4 is now current using kernel-3.10.0-693.5.2.el7.x86_64. You need to yum update to get up to date.
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