From: Ben (bmunyao@gmail.com)
Date: Thu Sep 27 2007 - 10:15:29 ART
---------- Forwarded message ----------
From: Ben <bmunyao@gmail.com>
Date: Sep 27, 2007 4:14 PM
Subject: Re: dhcp request packet
To: Darren Johnson <dazza_johnson@yahoo.co.uk>
When I change lease duration on the DHCP server, it seems to work.
Rack1R2(config)#do sh run | s dhcp
no ip dhcp use vrf connected
ip dhcp excluded-address 10.1.0.2 10.1.0.254
ip dhcp pool TEST
network 10.1.0.0 255.255.255.0
default-router 10.1.0.2
domain-name ie.com
dns-server 10.1.0.2
lease 0 4
Rack1R1(config-if)#do renew dhcp f0/0
Rack1R1(config-if)#
*Mar 1 02:14:55.871: DHCP: Attempting to speed up renewal timer
Rack1R1(config-if)#
*Mar 1 02:14:57.103: DHCP: SRequest attempt # 1 for entry:
*Mar 1 02:14:57.107: DHCP: SRequest - ciaddr: 10.1.0.1
*Mar 1 02:14:57.107: DHCP: SRequest placed lease len option: 86400
*Mar 1 02:14:57.111: DHCP: SRequest: 302 bytes
*Mar 1 02:14:57.111: DHCP: SRequest: 302 bytes
*Mar 1 02:14:57.115: IP: tableid=0, s=10.1.0.1 (local), d=
10.1.0.2(FastEthernet0/0), routed via FIB
*Mar 1 02:14:57.115: IP: s=10.1.0.1 (local), d=10.1.0.2 (FastEthernet0/0),
len 604, sending
*Mar 1 02:14:57.119 : UDP src=68, dst=67
*Mar 1 02:14:57.235: IP: tableid=0, s=10.1.0.2 (FastEthernet0/0), d=
10.1.0.1 (FastEthernet0/0), routed via RIB
Rack1R1(config-if)#
*Mar 1 02:14:57.239: IP: s=10.1.0.2 (FastEthernet0/0),
d=10.1.0.1(FastEthernet0/0), len 338, rcvd 3
*Mar 1 02:14:57.243: UDP src=67, dst=68
*Mar 1 02:14: 57.247: DHCP: Received a BOOTREP pkt
Rack1R1(config-if)#
*Mar 1 02:14:58.251: DHCP Client Pooling: ***Allocated IP address: 10.1.0.1
Rack1R1(config-if)#do sh dhcp lease
Temp IP addr: 10.1.0.1 for peer on Interface: FastEthernet0/0
Temp sub net mask: 255.255.255.0
DHCP Lease server: 10.1.0.2 , state: 3 Bound
DHCP transaction id: 1C85
Lease: 14400 secs, Renewal: 7200 secs, Rebind: 12600 secs
Temp default-gateway addr: 10.1.0.2
Next timer fires after: 01:59:48
Retry count: 0 Client-ID: cisco-cc00.0c20.0000-Fa0/0
Client-ID hex dump: 636973636F2D636330302E306332302E
303030302D4661302F30
Hostname: Rack1R1
Rack1R1(config-if)#
Sincerely
Ben
On 9/27/07, Ben <bmunyao@gmail.com> wrote:
>
> Hi Everyone,
>
> I did the following on dynamips:
>
> R1(f0/0)----------------------(f0/0)R2
> client server
>
> Note that on R2 (server), the default lease duration is not changed:
>
> Rack1R2(config)#
> Rack1R2(config)#do sh run | s dhcp
> no ip dhcp use vrf connected
> ip dhcp excluded-address 10.1.0.2 10.1.0.254
> ip dhcp pool TEST
> network 10.1.0.0 255.255.255.0
> default-router 10.1.0.2
> domain-name ie.com
> dns-server 10.1.0.2
> Rack1R2(config)#
>
> Rack1R1(config-if)#do sh run int f0/0
> Building configuration...
>
> Current configuration : 103 bytes
> !
> interface FastEthernet0/0
> ip dhcp client lease 0 2 0
> ip address dhcp
> duplex auto
> speed auto
> end
>
> Rack1R1(config-if)#do renew dhcp f0/0
> Rack1R1(config-if)#
> *Mar 1 02:06:32.731: DHCP: Attempting to speed up renewal timer
> Rack1R1(config-if)#
> *Mar 1 02:06:34.127: DHCP: SRequest attempt # 1 for entry:
> *Mar 1 02:06:34.131: DHCP: SRequest - ciaddr: 10.1.0.1
> *Mar 1 02:06:34.135: DHCP: SRequest placed lease len option: 86400
> *Mar 1 02:06:34.135: DHCP: SRequest: 302 bytes
> *Mar 1 02:06:34.139: DHCP: SRequest: 302 bytes
> *Mar 1 02:06:34.139: IP: tableid=0, s= 10.1.0.1 (local), d=10.1.0.2 (FastEthernet0/0),
> routed via FIB
> *Mar 1 02:06:34.143: IP: s=10.1.0.1 (local), d= 10.1.0.2(FastEthernet0/0), len 604, sending
> *Mar 1 02:06:34.147: UDP src=68, dst=67
> *Mar 1 02:06:34.295: IP: tableid=0, s=10.1.0.2 (FastEthernet0/0), d=10.1.0.1(FastEthernet0/0), routed via RIB
> Rack1R1(config-if)#
> *Mar 1 02:06:34.299 : IP: s=10.1.0.2 (FastEthernet0/0), d= 10.1.0.1(FastEthernet0/0), len 338, rcvd 3
> *Mar 1 02:06:34.303: UDP src=67, dst=68
> *Mar 1 02:06:34.307: DHCP: Received a BOOTREP pkt
> Rack1R1(config-if)#
> *Mar 1 02:06:35.311: DHCP Client Pooling: ***Allocated IP address:
> 10.1.0.1
> Rack1R1(config-if)#
>
>
> Rack1R1(config-if)#do sh dhcp lease
> Temp IP addr: 10.1.0.1 for peer on Interface: FastEthernet0/0
> Temp sub net mask: 255.255.255.0
> DHCP Lease server: 10.1.0.2, state: 3 Bound
> DHCP transaction id: 1C85
> Lease: 86400 secs, Renewal: 43200 secs, Rebind: 75600 secs
> Temp default-gateway addr: 10.1.0.2
> Next timer fires after: 11:59:41
> Retry count: 0 Client-ID: cisco-cc00.0c20.0000-Fa0/0
> Client-ID hex dump: 636973636F2D636330302E306332302E
> 303030302D4661302F30
> Hostname: Rack1R1
> Rack1R1(config-if)#
>
>
> Any ideas why the lease duration it gets is 24hrs, instead of the
> configured 2hrs (on client) ?
>
> TIA
>
> Ben
>
>
> On 9/27/07, Darren Johnson < dazza_johnson@yahoo.co.uk> wrote:
> >
> > Actually, the question states 'how do i make the
> > router generate a dhcp request packet to renew its
> > ethernet interface ip address every 3 hours'
> >
> > Therefore the router gets its own IP address via DHCP,
> > and you want to instruct it to genereate a dhcp
> > reuqest every 3 hours.
> >
> > The solution I had was to use 'ip dhcp client lease'
> > under interface configuration.
> >
> > Take a look at this:
> >
> >
> > http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hiad_r/adr_i1h.htm#wp1173534
> >
> >
> > --- jerry.du@accenture.com wrote:
> >
> > > Actually, you can set to 6 hours because DHCP client
> > > will ask DHCP
> > > server in half of DHCEP lease time.
> > >
> > > Regards,
> > > Jerry
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> > > [mailto:nobody@groupstudy.com] On Behalf Of
> > > Ryan Morris
> > > Sent: Wednesday, September 26, 2007 3:25 PM
> > > To: Cisco certification
> > > Subject: Re: dhcp request packet
> > >
> > > This is asking you to set the lease time to 3 hours
> > > in the router acting
> > > as a dhcp server. Under the pool configuration:
> > >
> > > lease <days> <hours>
> > >
> > > R.
> > >
> > >
> > > On Wed, 26 Sep 2007, slevin kremera wrote:
> > >
> > > > Hi EXPERTS
> > > >
> > > > how do i make the router generate a dhcp request
> > > packet to renew its
> > > > ethernet interface ip address every 3 hours
> > > >
> > > > SK
> > > >
> > > >
> > >
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