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do DHCP ping computers when the firewall is on??

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3 replies

by m.saadati

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Hi
Do DHCP ping computers (when it wants give them an ip)when the clint firewall is on??

Thanks

3 replies

by bfilmfan

If you mean the Windows firewall, you will not need to create a rule.

If you mean some other kind of firewall, you need the following ports open:

53 (UDP + TCP)
67 (UDP)
68 (UDP)

by nimmo

DHCP and ping are totally different application.

ping is used to test connectivity (using ICMP) and DHCP is used to assign IP addresses to hosts (using UDP).

The way DHCP works is:

Client send dhcp discover
server receives dhcp discover and sends dhcp offer.
client receives dhcp offer and sends dhcp request
server receives dhcp request and sends dhcp acknologement.

Depending on your firewall it may or may not block DHCP you'd have to look at the ACLs.

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