From: Sami (sy1977@gmail.com)
Date: Mon Jul 24 2006 - 18:30:49 ART
Another question in case of VRRP , I can use one of the phsical ip address
as the virtual IP of VRRP.
Right ?
On 7/24/06, Sami <sy1977@gmail.com> wrote:
>
> 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
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
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