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Telnet Issue, Broken TCP - Included config, debug, wireshark capture

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candeo

candeo

IS-IT--Management
Aug 4, 2006
3
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I cant believe what a hard time I am having figuring this out. Here is the scenario. I have a home cisco lab with a couple routers and switches. I have a lab router plugged into my home production network dumb switch getting an ip from dhcp. I can NOT telnet from any of my home computers into the router. What gives?


<<<Router CONFIG>>>

router1#show run
Building configuration...

Current configuration : 1124 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname router1
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$jZVI$L9StoMdzdjhKqTHGVaMqw.
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
!
!
!
interface FastEthernet0/0
description Link to Switch 1 f0/1
ip address 192.168.1.1 255.255.255.0
ip nat inside
speed 100
full-duplex
!
interface Serial0/0
no ip address
shutdown
!
interface FastEthernet0/1
description Link to home network switch
ip address dhcp
ip nat outside
speed 100
full-duplex
no cdp enable
!
interface Serial1/0
no ip address
shutdown
!
interface Serial1/1
no ip address
shutdown
!
interface Serial1/2
no ip address
shutdown
!
interface Serial1/3
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 192.168.1.1 0.0.0.0 area 0
!
ip nat inside source list 1 interface FastEthernet0/1 overload
ip classless
no ip http server
!
access-list 1 permit any
banner motd ^C

This is Router 1

^C
!
line con 0
logging synchronous
line aux 0
line vty 0 4
password telnet
login
!
!
end




<<<debug output from inside cisco router on f0/1>>>

router1#
*Mar 1 00:22:33.051: IP: tableid=0, s=192.168.10.5 (FastEthernet0/1), d=192.168.10.109 (FastEthernet0/1), routed via RIB
*Mar 1 00:22:33.051: IP: s=192.168.10.5 (FastEthernet0/1), d=192.168.10.109 (FastEthernet0/1), len 48, rcvd 3
*Mar 1 00:22:33.051: TCP src=3794, dst=23, seq=2081413630, ack=0, win=65535 SYN
*Mar 1 00:22:33.055: IP: tableid=0, s=192.168.10.109 (local), d=192.168.10.5 (FastEthernet0/1), routed via FIB
*Mar 1 00:22:33.055: IP: s=192.168.10.109 (local), d=192.168.10.5 (FastEthernet0/1), len 44, sending
*Mar 1 00:22:33.055: TCP src=23, dst=3794, seq=369665432, ack=2081413631, win=4128 ACK SYN
router1#
*Mar 1 00:22:33.059: IP: tableid=0, s=192.168.10.5 (FastEthernet0/1), d=192.168.10.109 (FastEthernet0/1), routed via RIB
*Mar 1 00:22:33.059: IP: s=192.168.10.5 (FastEthernet0/1), d=192.168.10.109 (FastEthernet0/1), len 40, rcvd 3
*Mar 1 00:22:33.059: TCP src=3794, dst=23, seq=2081413631, ack=2081413631, win=0 RST
router1#



<<<<<<<<<WireShark Capture on home computer trying to establish telnet with lab router>>>>>>>>


No. Time Source Destination Protocol Info
1 0.000000 IntelCor_b0:70:be Broadcast ARP Who has 192.168.10.109? Tell 192.168.10.5

Frame 1 (42 bytes on wire, 42 bytes captured)
Ethernet II, Src: IntelCor_b0:70:be (00:13:20:b0:70:be), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Address Resolution Protocol (request)

No. Time Source Destination Protocol Info
2 0.001078 Cisco_ee:19:e1 IntelCor_b0:70:be ARP 192.168.10.109 is at 00:04:dd:ee:19:e1

Frame 2 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Cisco_ee:19:e1 (00:04:dd:ee:19:e1), Dst: IntelCor_b0:70:be (00:13:20:b0:70:be)
Address Resolution Protocol (reply)

No. Time Source Destination Protocol Info
3 0.001089 192.168.10.5 192.168.10.109 TCP sitewatch > telnet [SYN] Seq=0 Win=65535 Len=0 MSS=1260

Frame 3 (62 bytes on wire, 62 bytes captured)
Ethernet II, Src: IntelCor_b0:70:be (00:13:20:b0:70:be), Dst: Cisco_ee:19:e1 (00:04:dd:ee:19:e1)
Internet Protocol, Src: 192.168.10.5 (192.168.10.5), Dst: 192.168.10.109 (192.168.10.109)
Transmission Control Protocol, Src Port: sitewatch (3792), Dst Port: telnet (23), Seq: 0, Len: 0

No. Time Source Destination Protocol Info
4 0.009139 192.168.10.109 192.168.10.5 TCP compressnet > sitewatch [SYN, ACK] Seq=0 Ack=0 Win=4128 Len=0 MSS=1260

Frame 4 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Cisco_ee:19:e1 (00:04:dd:ee:19:e1), Dst: IntelCor_b0:70:be (00:13:20:b0:70:be)
Internet Protocol, Src: 192.168.10.109 (192.168.10.109), Dst: 192.168.10.5 (192.168.10.5)
Transmission Control Protocol, Src Port: compressnet (3), Dst Port: sitewatch (3792), Seq: 0, Ack: 0, Len: 0

No. Time Source Destination Protocol Info
5 0.009155 192.168.10.5 192.168.10.109 TCP sitewatch > compressnet [RST] Seq=0 Win=0 Len=0

Frame 5 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: IntelCor_b0:70:be (00:13:20:b0:70:be), Dst: Cisco_ee:19:e1 (00:04:dd:ee:19:e1)
Internet Protocol, Src: 192.168.10.5 (192.168.10.5), Dst: 192.168.10.109 (192.168.10.109)
Transmission Control Protocol, Src Port: sitewatch (3792), Dst Port: compressnet (3), Seq: 0, Len: 0

No. Time Source Destination Protocol Info
6 2.906577 192.168.10.5 192.168.10.109 TCP sitewatch > telnet [SYN] Seq=0 Win=65535 Len=0 MSS=1260

Frame 6 (62 bytes on wire, 62 bytes captured)
Ethernet II, Src: IntelCor_b0:70:be (00:13:20:b0:70:be), Dst: Cisco_ee:19:e1 (00:04:dd:ee:19:e1)
Internet Protocol, Src: 192.168.10.5 (192.168.10.5), Dst: 192.168.10.109 (192.168.10.109)
Transmission Control Protocol, Src Port: sitewatch (3792), Dst Port: telnet (23), Seq: 0, Len: 0

No. Time Source Destination Protocol Info
7 2.914317 192.168.10.109 192.168.10.5 TCP compressnet > sitewatch [SYN, ACK] Seq=2667685270 Ack=0 Win=4128 Len=0 MSS=1260

Frame 7 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Cisco_ee:19:e1 (00:04:dd:ee:19:e1), Dst: IntelCor_b0:70:be (00:13:20:b0:70:be)
Internet Protocol, Src: 192.168.10.109 (192.168.10.109), Dst: 192.168.10.5 (192.168.10.5)
Transmission Control Protocol, Src Port: compressnet (3), Dst Port: sitewatch (3792), Seq: 2667685270, Ack: 0, Len: 0

No. Time Source Destination Protocol Info
8 2.914338 192.168.10.5 192.168.10.109 TCP sitewatch > compressnet [RST] Seq=0 Win=0 Len=0

Frame 8 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: IntelCor_b0:70:be (00:13:20:b0:70:be), Dst: Cisco_ee:19:e1 (00:04:dd:ee:19:e1)
Internet Protocol, Src: 192.168.10.5 (192.168.10.5), Dst: 192.168.10.109 (192.168.10.109)
Transmission Control Protocol, Src Port: sitewatch (3792), Dst Port: compressnet (3), Seq: 0, Len: 0

No. Time Source Destination Protocol Info
9 8.935036 192.168.10.5 192.168.10.109 TCP sitewatch > telnet [SYN] Seq=0 Win=65535 Len=0 MSS=1260

Frame 9 (62 bytes on wire, 62 bytes captured)
Ethernet II, Src: IntelCor_b0:70:be (00:13:20:b0:70:be), Dst: Cisco_ee:19:e1 (00:04:dd:ee:19:e1)
Internet Protocol, Src: 192.168.10.5 (192.168.10.5), Dst: 192.168.10.109 (192.168.10.109)
Transmission Control Protocol, Src Port: sitewatch (3792), Dst Port: telnet (23), Seq: 0, Len: 0

No. Time Source Destination Protocol Info
10 8.942767 192.168.10.109 192.168.10.5 TCP compressnet > sitewatch [SYN, ACK] Seq=3998878986 Ack=0 Win=4128 Len=0 MSS=1260

Frame 10 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Cisco_ee:19:e1 (00:04:dd:ee:19:e1), Dst: IntelCor_b0:70:be (00:13:20:b0:70:be)
Internet Protocol, Src: 192.168.10.109 (192.168.10.109), Dst: 192.168.10.5 (192.168.10.5)
Transmission Control Protocol, Src Port: compressnet (3), Dst Port: sitewatch (3792), Seq: 3998878986, Ack: 0, Len: 0

No. Time Source Destination Protocol Info
11 8.942786 192.168.10.5 192.168.10.109 TCP sitewatch > compressnet [RST] Seq=0 Win=0 Len=0

Frame 11 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: IntelCor_b0:70:be (00:13:20:b0:70:be), Dst: Cisco_ee:19:e1 (00:04:dd:ee:19:e1)
Internet Protocol, Src: 192.168.10.5 (192.168.10.5), Dst: 192.168.10.109 (192.168.10.109)
Transmission Control Protocol, Src Port: sitewatch (3792), Dst Port: compressnet (3), Seq: 0, Len: 0


 
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are you sure 192.168.10.109 is the correct IP?
try adding this:

config t
username SOMETHING password SOMETHING
enable secret SOMETHING

aaa new-model

line vty 0 4
password SOMETHING (same as above username SOMETHING)
 
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What is this switch you are connecting to? Are you telnetting from a node on the switch connected to fa0/0? Can you ping the node from your router? Is the other end of fa0/0 hard coded as well? Start with verifying L1 by pings...

Burt
 
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also on fa0/1 you are doing a 'NAT' but i dont see list 1
ip nat inside source list 1 interface FastEthernet0/1 overload
 
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I shall try to answer all questions...

North323:

yes im sure that 192.168.10.109 is the correct IP of f0/1 given to that interface by dhcp (show ip int brief confirms this). I also tried the username gig you sugested, no good.



burtsbees:

I am using a netgear gige switch model: gs605 v2
I am not telnetting from a node on that particular switch, I am telnetting from another switch connected to that switch (I have two 5port netgear switches linked to each other)
I CAN ping f0/1 (192.168.10.109) from my home computer with no problems what so ever.


Like I said, very confused at how I can ping this just fine from my home computer and not telnet from it. If it helps to know this, nat seems to work fine to. If I plug a laptop in on the inside of the lab, I can use the internet, and all sorts of different ports just fine.

What the !?@??!@
 
Upvote 0 Downvote
post a show route/ospf pls



M. Knorr

MCSE, MCTS, MCSA, CCNA
 
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