×

Warning message

  • Cisco Support Forums is in Read Only mode while the site is being migrated.
  • Cisco Support Forums is in Read Only mode while the site is being migrated.

ip directed broadcast to an interface secondary address

Answered Question
Jun 17th, 2014
User Badges:

I have a new network going in place that's going to coexist with an existing network as a secondary IP address on the interface.  We have an application that uses broadcast to communicate.  I configured "ip directed broadcast" but it hasn't been working.  Is this possible to do with a secondary address?  Interface configuration is below:

interface Vlan108
 description users
 ip address 192.168.0.13 255.255.255.0 secondary
 ip address 10.61.8.1 255.255.255.0
 ip helper-address 10.61.1.26
 ip directed-broadcast
end

Correct Answer by Richard Burts about 3 years 2 months ago

I do not see a problem in this config. If a packet with destination address of 192.168.0.255 gets to the interface then I would expect that it would be sent out into the vlan as a local broadcast. Note that this broadcast would also be seen by host in the 10.68.8 network. Are you sure that packets for 192.168.0.255 are getting to the interface?

 

HTH

 

Rick

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Loading.
Correct Answer
Richard Burts Tue, 06/17/2014 - 06:42
User Badges:
  • Super Silver, 17500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

I do not see a problem in this config. If a packet with destination address of 192.168.0.255 gets to the interface then I would expect that it would be sent out into the vlan as a local broadcast. Note that this broadcast would also be seen by host in the 10.68.8 network. Are you sure that packets for 192.168.0.255 are getting to the interface?

 

HTH

 

Rick

riccobene Mon, 06/23/2014 - 11:01
User Badges:

This is correctly working, I was unsure if this worked on an interface with secondary and it definitely does.  Thanks!

Actions

This Discussion