Solved: IP Helper on WAN/LAN

Rodrigo Gurriti · ‎04-14-2010

Hello,

I have the scenario attached, this scenario the wan is frame-relay

My question is how can a DHCP server remote identify what POOL of IP address to use?

I know I can use a local dhcp server, even the router as dhcp server, but the centralized dhcp is a requirement :/

paolo bevilacqua · ‎04-14-2010

It know because the router insers GW address in the request packet.

Be aware that when WAN is down, the "requirement" becomes a major hinderance, and everyone gets very angry.

View solution in original post

shailesh.h · ‎04-14-2010

i think attached document will provide you more information

http://h40060.www4.hp.com/procurve/uk/en/pdfs/5300xl_dhcp_relay.pdf

Shailesh

View solution in original post

paolo bevilacqua · ‎04-14-2010

It know because the router insers GW address in the request packet.

Be aware that when WAN is down, the "requirement" becomes a major hinderance, and everyone gets very angry.

Rodrigo Gurriti · ‎04-14-2010

For instance,

Will F1 forward the dhcp discovery from a workstation to the DHCP server using as source address F1's local ethernet? Is that how it knows ? or is there a option that it uses ?

Thank you!

shailesh.h · ‎04-14-2010

i think attached document will provide you more information

http://h40060.www4.hp.com/procurve/uk/en/pdfs/5300xl_dhcp_relay.pdf

Shailesh

Rodrigo Gurriti · ‎04-14-2010

Thanks for the help...

I found also these documents very useful

http://www.freesoft.org/CIE/RFC/2131/20.htm

http://www.tarunz.org/~vassilii/TAU/protocols/dhcp/frame.htm

They confirm what shailesh said above