From: Roberto Fernandez (rofernandez@us.telefonica.com)
Date: Tue Jul 25 2006 - 17:33:11 ART
Sami,
Usually if something it is not strictly required, but they want you to
do it any way, they will ask for it, explicitly or implicitly.
Best Regards,
Roberto
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sami
Sent: Tuesday, July 25, 2006 3:55 PM
To: Victor Cappuccio
Cc: Bill.McKenzie@bisys.com; ccielab
Subject: Re: DHCP
Everyone has different view,
Could someone give the right answer what is expected in lab... exclude
ROUTER IP or not?
On 7/25/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
> Hi Guys,
>
> IMO the ip dhcp ping packets is enabled by default, but imagine that
the
> router with ip add 170.17.162.1 goes off the net, dies, whatever. It
would
> send ping to that IP address 2 times and without any respond, in a new
> DHCP
> Request it could assign the IP Address.
>
> And yes you can assign the same physical address that other routers
has in
> VRRP, but his is not true for HSRP.
>
> R3(config)#int e0/0
> R3(config-if)#ip add 170.17.162.1 255.255.255.0
> R3(config-if)#standby 1 ip 170.17.162.1
> % address cannot equal interface IP address
> R3(config-if)#!! Hmmm does not work
> R3(config-if)#do show run int e0/0
> Building configuration...
>
> Current configuration : 91 bytes
> !
> interface Ethernet0/0
> ip address 170.17.162.1 255.255.255.0
> half-duplex
> end
>
> R3(config-if)#vrrp 1 ip 170.17.162.1
>
> It does take the command.
>
> Saludos,
> Victor
>
>
> -----Mensaje original-----
> De: Bill.McKenzie@bisys.com [mailto:Bill.McKenzie@bisys.com]
> Enviado el: Lunes, 24 de Julio de 2006 05:40 p.m.
> Para: Sami; Victor Cappuccio
> CC: ccielab
> Asunto: Re: DHCP
>
> In my opinion, with something like this they are looking for the
> configuration of it and not just assuming you know that it checks
before
> it
> will assign the address. I could be wrong though...
>
>
>
> ----- Original Message -----
> From: Sami [sy1977@gmail.com]
> Sent: 07/24/2006 05:25 PM
> To: "Victor Cappuccio" <cvictor@protokolgroup.com>
> Cc: ccielab@groupstudy.com
> Subject: Re: DHCP
>
>
>
> Thanks Everyone
>
> Why are you excluding Default gateway address from DHCP pool. I
understand
> it is not necessay because DHCP ping the IP before assigning to the
host.
>
> Could some one let me know is it required to exclude these address
from
> DHCP
> pool or not from lab exam point of view.
>
> Thanks
>
>
> On 7/23/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
> >
> > Hi Sami,
> >
> > Please allow me on this one:
> >
> > DHCP is a Service for passing configuration information to hosts on
a
> TCP
> > IP
> > network as far as I know, and yes you can set 2 Default Gateways via
> DHCP,
> > but you will need to method at the client like Gateway Discovery
> Protocol
> > to
> > avoid sending packets to a Dead GW
> >
> > Something similar as this:
> >
> > ip dhcp excluded-address 170.17.162.2
> > ip dhcp excluded-address 170.17.162.1
> > !
> > ip dhcp pool MYPOOL
> > network 170.17.162.0 255.255.255.0
> > default-router 170.17.162.1 170.17.162.2
> >
> >
> > If we add one host in that network, to see the information provided
by
> > this
> > great live saver feature.
> >
> > Dummy_Host#show ip route | b Gate
> > Gateway of last resort is 170.17.162.1 to network 0.0.0.0
> >
> > 170.17.0.0/24 is subnetted, 1 subnets
> > C 170.17.162.0 is directly connected, Vlan666
> > S* 0.0.0.0/0 [254/0] via 170.17.162.1
> >
> > Lets test this,
> >
> > Dummy_Host#ping 204.12.1.4
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 204.12.1.4, timeout is 2 seconds:
> > .!!!!
> > Success rate is 80 percent (4/5), round-trip min/avg/max =
140/141/144
> ms
> >
> > Yeah seems to work
> > Now let's shut down the Primary Default Gateway to see what happens
> >
> > R1(config)#int f0/0
> > R1(config-subif)#sh
> > R1(config-subif)#
> >
> > The information from the Routing Table at Dummy host is not erased
> >
> > Dummy_Host#show ip route | be Gate
> > Gateway of last resort is 170.17.162.1 to network 0.0.0.0
> >
> > 170.17.0.0/24 is subnetted, 1 subnets
> > C 170.17.162.0 is directly connected, Vlan666
> > S* 0.0.0.0/0 [254/0] via
> >
> >
> > Let's ping the Def-gw?
> >
> >
> > Dummy_Host#ping 170.17.162.1
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 170.17.162.1, timeout is 2
seconds:
> > .....
> > Success rate is 0 percent (0/5)
> >
> > does not work :(
> >
> > So we need a method of getting redundancy with out needing to shut
down
> > the
> > Interface and renewing the IP Address / Default Gw for providing the
> > needed
> > redundancy.
> >
> > At R1 and R2 (or the gateways) interface sitting with the dummy host
put
> > this
> >
> > vrrp 1 ip 170.17.162.1
> >
> > wit only 1 default-router 170.17.162.1 at the ip dhcp pool MYPOOL,
> > because
> > it's not logic to gave the 2 if you run some other redundancy method
> used
> > in
> > your wording.
> >
> > And that's it
> >
> > Dummy_Host#ping 170.17.162.1
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 170.17.162.1, timeout is 2
seconds:
> > !!!!!
> > Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
> >
> > Dummy_Host#ping 204.12.1.4
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 204.12.1.4, timeout is 2 seconds:
> > !!!!!
> > Success rate is 100 percent (5/5), round-trip min/avg/max =
112/114/116
> ms
> >
> > Useful debug commands
> >
> > show arp
> > show vrrp
> > show ip int
> > show ip route
> > show ip dhcp bind
> > clear arp
> > deb arp
> > ping (always useful)
> >
> > are great tools in this scenario.
> >
> > Try it with a couple of routers it would be fun!!
> >
> > HTH
> > Victor.-
> >
> > -----Mensaje original-----
> > De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre
de
> Sami
> > Enviado el: Domingo, 23 de Julio de 2006 06:26 a.m.
> > Para: ccielab@groupstudy.com
> > Asunto: DHCP
> >
> > Group,
> >
> > Is it possible to provide two default gateway to clients using DHCP
> ? one
> > of the task say provide gateway redendency to DHCP clients but don't
use
> > HSRP to achieve this...
> >
> > Thanks
> >
> >
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