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DHCP Relay?
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TOPIC: DHCP Relay?
#35348
DHCP Relay? 3 Years, 1 Month ago  
Using 5.2 -- is there a DHCP relay agent that I can install?
Justin
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#35354
Re:DHCP Relay? 3 Years, 1 Month ago  
Hi Justin. What would you want to achieve? If it is just using another DHCP server on the network other than the one that comes with ClearOS, I am sure you can go ahead and disable this feature and configure a seperate DHCP server to serve DHCP requests on your network
Thomas Tapfumanei
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#35392
Re:DHCP Relay? 3 Years, 1 Month ago  
The router is routing several different subnets and I want a single DHCP server that exists on only one of the subnets. The router needs to forward the DHCP packets to the proper server when it sees them come in. On other linux distributions this is typically available in a package called dhcrelay, but I don't see this package available in the clearos repository.
Justin
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#36083
Re:DHCP Relay? 3 Years, 1 Month ago  
I can't possibly be the only one wanting to do this...
Justin
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#67527
Re:DHCP Relay? 1 Week, 4 Days ago  
no you are not the only one!

I am using 6.5.0 how do I enable dhcp relay ?

setting up Citrix PVS and need this feature

firewall:
-eth0 -external (internet)
-eth1 -lan (dns,dhcp,AD,files,sql,mail,wsus,ca,printsrv,web) 192.168.100.0/24 (vlan10)
-eth2 -lan (eqxDB,eqxApp,eqxAdmin) 192.168.101.0/24 (vlan20)
-eth3 -lan (xenLic,xenDDC,xenSF,xenAPP,xenPVS,xenvdi-##) 192.168.102.0/24 (vlan30)

how can I setup dnsmasq to dhcp-relay from eth3 to 192.168.100.3 (AD-Domain-Controller) ?
Fbifido
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#67545
Re:DHCP Relay? 1 Week, 3 Days ago  
DNSMasq does not have any native DHCP relay features. However, a major writer of DNSMasq has written dhcp-relay which is a very light weight DHCP relay worker. We don't have a package for this yet and you would have to install this via building it on your server. BIND is an alternative but it also does DHCP and DNS and will collide with DNSMasq so you'd have to turn off DNSMasq to use the ISC BIND package.

http://www.thekelleys.org.uk/dhcp-helper/
Dave Loper
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#67554
Re:DHCP Relay? 1 Week, 3 Days ago  
www.clearfoundation.com/component/option...view/id,62816/#67551

I don't thing dhcp-helper is neede any more, because 2.72 support
--dhcp-relay
--dhcp-proxy

but I can't make a rpm from it.
Fbifido
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#67576
Re:DHCP Relay? 1 Week, 3 Days ago  
DNSMasq 2.72 is in updates-testing

yum --enablerepo=clearos-updates-testing update dnsmasq

If what you need is in 2.72, you should be able to get it there.

FWIW, that rpm is being heavily tested right now due to a dependency in upcoming apps. Should be pretty stable.
Dave Loper
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#67579
Re:DHCP Relay? 1 Week, 3 Days ago  
do you know the syntax in 2.7.2 for :

dhcp-boot= 'as pertain to interface
dhcp-option= 'as pertain to 66 & 67, with interface

dhcp-relay=
dhcp-proxy=


I still can't believe that
.... dhcp-boot=ardbp32.bin,xenps.doain.lan,192.168.102.5

option work, but the
.... dhcp-option=eth3,66,"192.168.102.5"
.... dhcp-option=eth3,67,"ardbp32.bin"

did not work.

Thanks.
Fbifido
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Last Edit: 2015/01/16 13:23 By Fbifido.
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#67612
Re:DHCP Relay? 1 Week ago  
Dave Loper wrote:
DNSMasq 2.72 is in updates-testing

yum --enablerepo=clearos-updates-testing update dnsmasq

If what you need is in 2.72, you should be able to get it there.

FWIW, that rpm is being heavily tested right now due to a dependency in upcoming apps. Should be pretty stable.


I did just this, but I have a major problem.
I have now disable dhcp on my eth3 in webcofig, that's the only one that had dhcp enable.
but my workstation is still getting dhcp from this box. WHY?

I also remove any --dhcp-option=* from /etc/dnsmasq.d/dhcp.conf
I also remove the dhcp-boot=* option from the /etc/dnsmasq.conf file. but my network boot is still getting dhcp & tftp info. WHY?


Help......!!!!!

Fbifido
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Last Edit: 2015/01/19 10:09 By Fbifido.
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