[colug-432] DHCP/bootp broadcast question

Mark Aufdencamp mark at aufdencamp.com
Wed Nov 11 08:44:56 EST 2015

VLAN's bring to mind the need for jumbo packets in order to accommodate
the VLAN TAG.  Are you tagging of the NIC, or allowing the switch to
form the VLAN, which would infer configuring the switch correctly for
Tag assignment on ingress and stripping on egress.

> -------- Original Message --------
> Subject: [colug-432] DHCP/bootp broadcast question
> From: Stephen Potter <spp at unixsa.net>
> Date: Tue, November 10, 2015 5:29 pm
> To: Central OH Linux User Group - 432xx <colug-432 at colug.net>
> I've got a bit of a strange situation.  I'm probably just missing 
> something easy, but right now I'm stuck.
> I'm building a new Satellite 6 virtual machine including DHCP, PXE, 
> Kickstart, etc.  I've got an existing Satellite 5 VM running on the same 
> ESX host on the same VLAN, same portgroup, same services but difference 
> DHCP scope.  I've attached the S6 to my vCenter, so I can do one stop 
> provisioning.  When I create the new VM in Satellite6, I can see it get 
> created on a different ESX host by vCenter and powered up, but the DHCP 
> times out and the actual build never happens.
> If I run tcpdump on both the S5 and S6 (remember, same ESX host, same 
> VLAN, same portgroup), on S5 I can see the DHCP request traffic.  On the 
> S6 host, I don't even see the traffic.  I've disabled the firewall and 
> SElinux on the S6 box, so they aren't getting in the way.  Normal 
> networking between the two ESX hosts, nothing blocking traffic from the 
> switch standpoint.
> What am I missing?
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