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Posted by Merv on May 29, 2008, 12:11 pm
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> > > > Dear all, i just wanted to check what the source address of the IP
> > > > packet that is generated by a router configured with 'ip helper
> > > > A.B.C.D' on a local interface would be.
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> > > > i need to know this as the router is connected via an IPSEC VPN
> > > > (crypto enabled on the dialer0 interface) to a central location on
> > > > which the DHCP server is connected, and i need to be sure that the
> > > > forwarded dhcp request will generate crytpo.
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> > > > Thanks
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> > > It should be the IP of the SVI that received the DHCP request. To put
> > > it more clearly, if a node broadcasts a request for an IP, whatever
> > > router interface received that broadcast will be used as the source IP
> > > of the request so that the DHCP server knows which subnet to give an
> > > IP from. That is my understanding, but have never really sniffed the
> > > dhcp server side of the request.
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> > Thanks for post reply.
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> > one (poss dum qu !) - what does SVI stand for ?
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> Switched virtual interface. If you are running a layer 3 switch or
> layer 2 with MSFC, its the vlan interface. Its basically the layer 3
> interface in a network that generally acts as an entry/exit point to
> the subnet/vlan. If you are running a router on a stick (router to a
> switch), then the f0/1 or g0/1 would be the SVI, although in this
> situation its usually just referred to as an interface.
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