From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Jul 18 2004 - 20:10:40 GMT-3
Richard & all respondents,
Excellent !!!
You broke the code. You realized that the info given in the problem - 5
active interfaces - was a decoy put in there to throw you off track. You
also realized that you could use NAT to translate the ip address of lo133
into any other address which was known throughout your network.
The moral of the story: If you have to use an address for some function
which isn't allowed to be advertised (and all the standard restrictions of
the lab are applicable), think NAT.
When I saw this problem, I immediately thought of NAT, but then I couldn't
figure out how to use NAT to translate lo133's address into each of the ip
addresses assigned to each of the active interfaces depending upon from
which interface the telnet would exit the router. But, what I didn't
immediately realize was that there's no need for lo133's to be translated
into each of the 5 different ip addresses assigned to each active
interface - any address on the same router as lo133 known throughout the
network would do fine.
Score 1 for Richard.
Tim
----- Original Message -----
From: "Peasah, Richard Kwame" <rpeasah@ku.edu>
To: "Group Study" <ccielab@groupstudy.com>
Sent: Sunday, July 18, 2004 6:25 PM
Subject: RE: Sunday's Network Brain Quiz
> R1#tel 150.16.5.5
> Trying 150.16.5.5 ... Open
>
>
> User Access Verification
>
> Password:
> R5#exit
>
> [Connection to 150.16.5.5 closed by foreign host]
> R1#tel 150.16.2.2
>
> R1#tel 150.16.3.3
> Trying 150.16.3.3 ... Open
>
>
> User Access Verification
>
> Password:
> R3#exit
>
> [Connection to 150.16.3.3 closed by foreign host]
> R1#tel 150.16.4.4
>
>
> R1#tel 150.16.4.4
> Trying 150.16.4.4 ... Open
>
>
> User Access Verification
>
> Password:
> R4#exit
>
> router eigrp 1
> redistribute ospf 1
> network 172.16.5.1 0.0.0.0
> default-metric 10000 1000 255 1 1500
> no auto-summary
> eigrp router-id 150.16.1.1
> !
> router ospf 1
> router-id 150.16.1.1
> log-adjacency-changes
> redistribute eigrp 1 subnets
> network 150.16.16.1 0.0.0.0 area 0
> network 172.16.16.1 0.0.0.0 area 0
> !
> ip nat inside source static 154.6.133.1 172.16.16.1
>
> R1#sh ip route
>
> Gateway of last resort is not set
>
> 154.6.0.0/24 is subnetted, 1 subnets
> C 154.6.133.0 is directly connected, Loopback133
> 172.16.0.0/24 is subnetted, 2 subnets
> C 172.16.16.0 is directly connected, Serial0/0.16
> C 172.16.5.0 is directly connected, FastEthernet0/0
> 150.16.0.0/24 is subnetted, 4 subnets
> O 150.16.4.0 [110/65] via 172.16.16.4, 00:04:16, Serial0/0.16
> D 150.16.5.0 [90/156160] via 172.16.5.5, 01:41:42, FastEthernet0/0
> O 150.16.3.0 [110/65] via 172.16.16.3, 00:04:16, Serial0/0.16
> C 150.16.1.0 is directly connected, Loopback0
> R1#
>
> R3#sh ip route
>
> Gateway of last resort is not set
>
> 172.16.0.0/24 is subnetted, 3 subnets
> C 172.16.35.0 is directly connected, Serial0/1
> C 172.16.16.0 is directly connected, Serial0/0.16
> O E2 172.16.5.0 [110/20] via 172.16.16.1, 00:04:59, Serial0/0.16
> 150.16.0.0/24 is subnetted, 3 subnets
> O 150.16.4.0 [110/65] via 172.16.16.4, 00:04:59, Serial0/0.16
> O E2 150.16.5.0 [110/20] via 172.16.16.1, 00:04:59, Serial0/0.16
> C 150.16.3.0 is directly connected, Loopback0
> R3#
>
> R4#sh ip route
>
>
> Gateway of last resort is not set
>
> 172.16.0.0/24 is subnetted, 2 subnets
> C 172.16.16.0 is directly connected, Serial0.16
> O E2 172.16.5.0 [110/20] via 172.16.16.1, 00:05:32, Serial0.16
> 150.16.0.0/24 is subnetted, 3 subnets
> C 150.16.4.0 is directly connected, Loopback0
> O E2 150.16.5.0 [110/20] via 172.16.16.1, 00:05:32, Serial0.16
> O 150.16.3.0 [110/65] via 172.16.16.3, 00:05:32, Serial0.16
> R4#
>
> R5#sh ip route
>
> Gateway of last resort is not set
>
> 172.16.0.0/24 is subnetted, 4 subnets
> C 172.16.35.0 is directly connected, Serial1
> C 172.16.25.0 is directly connected, Serial0
> D EX 172.16.16.0 [170/537600] via 172.16.5.1, 01:50:03, Ethernet0
> C 172.16.5.0 is directly connected, Ethernet0
> 150.16.0.0/24 is subnetted, 3 subnets
> D EX 150.16.4.0 [170/537600] via 172.16.5.1, 00:06:01, Ethernet0
> C 150.16.5.0 is directly connected, Loopback0
> D EX 150.16.3.0 [170/537600] via 172.16.5.1, 01:41:30, Ethernet0
> R5#
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Sunday, July 18, 2004 1:24 PM
> To: Group Study
> Subject: Sunday's Network Brain Quiz
>
> Hi guys,
>
> Here's an interesting challenge for all those ccie wannabe's out there:
>
>
> There's a router in the middle of your network with 5 active interfaces.
> It's
> running a couple of different routing protocols: eigrp and ospf.
>
> On this router a loopback interface, lo133, is configured with the
> address
> 154.6.133.1/24 which is not known or advertised by any routing protocol.
>
> On this same router, the command, ip telnet source-interface lo133, is
> configured.
>
> What additional configuration is needed so that telnet sessions
> initiated from
> this router are successful to any other router in the network?
>
> Prove your config by showing multiple successful telnets.
>
>
> Hope you have fun with this. Tim
>
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