How does DHCP Server "Ping IP when allocating new IP" work?

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Announcements
Please sign in to see details of an important advisory in our Customer Advisories area.

How does DHCP Server "Ping IP when allocating new IP" work?

L0 Member

What's the destination MAC address when this ping is sent?

When is this ping sent?  After/Before DHCP requests?

Thanks.

1 REPLY 1

L6 Presenter

Just guessing here but:

1) ARP-WHOHAS is sent... (unless its reachable through some nexthop because then the 2) below is sent to this nexthop).

2) If someone replies to above (could be some proxyarp or so) an icmp echo request is sent to the mac (unless its routed through some nexthop).

3) If echo reply (or administratively prohibited) is returned the box assumes this ip is already taken.

Someone from PA who could confirm? 🙂

The downside would be if you have a personal/desktop firewall who blocks incoming echo requests...

  • 2434 Views
  • 1 replies
  • 2 Likes
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!