Getting Owned! Cisco 1841

showbo

Ok guys, all was well with my test/practice router. It is a cisco 1841, I setup Fa 0/0 with 192.168.1.0/27 and after i turned on SSH and Telnet and used 192.168.1.2 on my Laptop to Telnet to 192.168.1.1 on fa 0/0.

Well I come back today to practice some more, hook up my laptop to Fa 0/0 nothing? Hook back up my console cable and this is what I see:


R1 con0 is now available


Press RETURN to get started.


&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
This is a test Lab and has no use in RL.....
Please log out A.S.A.P or be punshied by death
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
&&&&&&&&&&&&&&&&&&&
O'Hi Thar!
&&&&&&&&&&&&&&&&&&&

User Access Verification
Password:
R1>en
Password:
R1#sho run
Building configuration...
Current configuration : 1420 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$y2EX$sFcDWSuPJM4gLYfuZl8EG1
!
no aaa new-model
!
resource policy
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no ip subnet-zero
ip cef
!
!
no ip dhcp use vrf connected
!
!
no ip ips deny-action ips-interface
no ip domain lookup
ip domain name home.com
!
!
!
!
username cisco privilege 15 secret 5 $1$tZc6$tp0MmPYyrbrYiSFxTied8/
!
!
!
!
!
interface FastEthernet0/0
description This is a test Lab 192.168.1.0/27
no ip address
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
ip address 192.168.1.33 255.255.255.224
!
ip classless
!
no ip http server
no ip http secure-server
!
!
!
control-plane
!
banner login ^C
&&&&&&&&&&&&&&&&&&&
O'Hi Thar!
&&&&&&&&&&&&&&&&&&&
^C
banner motd ^C
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
This is a test Lab and has no use in RL.....
Please log out A.S.A.P or be punshied by death
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
^C
!
line con 0
exec-timeout 0 0
password 7 0822455D0A16
logging synchronous
login
line aux 0
password 7 1511021F0725
login
line vty 0 4
exec-timeout 0 0
password 7 094F471A1A0A
logging synchronous
login local
transport input telnet ssh
!
end
R1#

Well when I run sh interface I see this on my Fa 0/0 and 0/1:
FastEthernet0/0 is up, line protocol is down
Internet protocol processing disabled
FastEthernet0/1 is administratively down, line protocol is down
Internet protocol processing disabled

Ok. No clue what I borked? All was well the other day and now it says Internet protocol processing disabled? The only thing left is my description with whicn I put the IP subnet of what it was 192.168.1.0/27!????

After I was done the other day I did a copy run start and then just turned off the router and put it up. Today I get this and can't assign an address because it always says its a bad subnet? Any help please! Thanks in advance!

NetworkVeteran

showbo wrote: »

Today I get this and can't assign an address because it always says its a bad subnet? Any help please! Thanks in advance!

showbo, think like an engineer. That's what you're aiming for. Don't you think it *might* help if you provided the actual command you attempted and the exact error message you received?

I setup Fa 0/0 with 192.168.1.0/27

That can't be precisely what you configured on Fa0/0. It would reject 192.168.1.0/27.

192.168.1.0/27
11000000.10110000.00000001.00000000
nnnnnnnn.nnnnnnnn.nnnnnnnn.ssshhhhh

IOS wouldn't accept this all-zero host address.

What did you configure?

I'd love to help if only you'd provide some specifics to go on.

showbo

NetworkVeteran wrote: »

showbo, think like an engineer. That's what you're aiming for. Don't you think it *might* help if you provided the actual command you attempted and the exact error message you received?

My issue is this which I did post at the bottom of my post:

Well when I run sh interface I see this on my Fa 0/0 and 0/1:
FastEthernet0/0 is up, line protocol is down
Internet protocol processing disabled
FastEthernet0/1 is administratively down, line protocol is down
Internet protocol processing disabled

Why does it say that now? That's what I can't figure out.

R1#config t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#int fa 0/0
R1(config-if)#ip address 192.168.1.0 255.255.255.224
Bad mask /27 for address 192.168.1.0
R1(config-if)#ip address 192.168.1.1 255.255.255.224
Bad mask /27 for address 192.168.1.1

Tried both 1.0 and 1.1, again no clue what I borked all I did was power off the router and turn it back on.

showbo

NetworkVeteran wrote: »

showbo, think like an engineer. That's what you're aiming for. Don't you think it *might* help if you provided the actual command you attempted and the exact error message you received?


That can't be precisely what you configured on Fa0/0. It would reject 192.168.1.0/27.

192.168.1.0/27
11000000.10110000.00000001.00000000
nnnnnnnn.nnnnnnnn.nnnnnnnn.ssshhhhh

IOS wouldn't accept this all-zero host address.

What did you configure?

I'd love to help if only you'd provide some specifics to go on.

Ok, I do remember I setup Fa with 192.168.1.1 so, when it was working the other day I entered it like so:

config t
int fa 0/0
ip address 192.168.1.1 255.255.255.224


I figured it out for some reason before I shutdown the router the other day I ran 'no ip subnet-zero'

After going into config t and enableing 'ip subnet-zero' I was able to assign my Fa 0/0 the 192.168.1.1/27 address and assign my Se 0/0/0 its 192.168.1.33/27 address!

Thanks NetworkVertern. The comment where you said to think like an engineer made me look at my config a thrid and fourth time over!

mella060

Yeh that makes sense. You wouldn't be able to use the 1st or zero subnet with no ip subnet-zero configured.

So you wouldn't be able to use subnet 192.168.1.0 /27 but you could use 192.168.1.32 /27

drkat

it'd never be able to use .0 as a valid host address regardless of ip subnet zero enabled