Why would I be getting ARP broadcasts from the Internet??

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wcruppel
DD-WRT Novice


Joined: 25 Aug 2020
Posts: 2
PostPosted: Tue Aug 25, 2020 18:45    Post subject: Why would I be getting ARP broadcasts from the Internet?? Reply with quote
I switched ISPs recently, and now I'm suddenly getting flooded with ARP broadcasts from the Internet (IPs that are outside of my ISP's subnet) on my LAN, to the tune of about 60-70 Kbps. Not huge, I know, but entirely unexpected.

Why my ISP is sending these to my router in the first place is another question, and I'm asking them that.

But, why would DD-WRT broadcast these on my LAN? I don't see anywhere in the DD-WRT software where I can control this behavior. Can I stop this somehow?

Thanks.
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eibgrad
DD-WRT Guru


Joined: 18 Sep 2010
Posts: 9157
PostPosted: Tue Aug 25, 2020 21:18    Post subject: Reply with quote
Try adding the following to the startup script.

Code:
for i in /proc/sys/net/ipv4/conf/*/arp_ignore; do echo 1 > $i; done
for i in /proc/sys/net/ipv4/conf/*/arp_announce; do echo 2 > $i; done

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wcruppel
DD-WRT Novice


Joined: 25 Aug 2020
Posts: 2
PostPosted: Wed Aug 26, 2020 1:13    Post subject: Reply with quote
eibgrad wrote:
Try adding the following to the startup script.


Thanks for the advice.
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