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Is there a simple ping-like command to test whether a DHCP service is running on a network? ...on Linux

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6 Answers

up vote 1 down vote accepted

Even if you don't use a Nagios monitoring server, you can grep the check_dhcp binary or compile it from source and use the check to test a DHCP-Server. E.g.

./check_dhcp -v -s <dhcp_server_address> -r <expected_ip_address> -m <mac_address_touse>
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There is a program called dhcpping

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why not just make a dhcp request ?

dhclient

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Probably because that will make your system use the IP assigned by the DHCP server which is not what one wants when e.g. trying to find out if there are rogue DHCP servers in his network. –  ThiefMaster Jun 9 '12 at 18:54
    
-n option helps here? –  akostadinov Jan 24 '13 at 22:20
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On Debian-Ubuntu systems:

dhcpd -f

gives good feedback and tests the configuration.

On RH systems try:

/etc/rc.d/init.d/dhcpd configtest
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if you use nagios you could monitor it with check_dhcp

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or you can try dhcpcd in test mode:

dhcpcd -T eth0

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