From: Mahesh Shivaswamy (maheshs.cisco@gmail.com)
Date: Wed Oct 22 2008 - 23:04:32 ARST
My goal is to check what kind of error msg it gives when I block tcp, but
before that trying to see the connection goes through before applying the
ACL.
rgds
Mahesh
On Wed, Oct 22, 2008 at 7:55 PM, Hobbs <deadheadblues@gmail.com> wrote:
> if it was listening you would probably end of with a "blank" telnet
> session, like when you telnet to port 80 on an http server...this is my
> assumption. not sure of the goal of wanting to know if you are listening on
> port 179...why do you need to know this? maybe there is another to do it if
> we know your goal.
>
> Now I have heard of wanting to know if port 179 is being filtered somewhere
> in your network, now you can be sure it isn't, because you are getting the
> RST from the destination
>
>
> On Wed, Oct 22, 2008 at 6:34 PM, Charles Henson <chenson@gmail.com> wrote:
>
>> I believe if you sent an RST then you are not listening on 179. Else
>> you would have completed the 3 way handshake and then failed on the
>> protocol. Someone correct me if I'm wrong here.
>>
>>
>> On 10/22/08, Mahesh Shivaswamy <maheshs.cisco@gmail.com> wrote:
>> > I need to chk if SW1 is listening on port 179.
>> >
>> > rgds
>> > Mahesh
>> >
>> >
>> > On Wed, Oct 22, 2008 at 7:00 PM, Hobbs <deadheadblues@gmail.com> wrote:
>> >
>> >> what are you trying to test?
>> >>
>> >> On Wed, Oct 22, 2008 at 5:54 PM, Mahesh Shivaswamy <
>> >> maheshs.cisco@gmail.com> wrote:
>> >>
>> >>> Hi,
>> >>>
>> >>> When I telnet on port 23 between R4 & SW1 its fine, but when I telnet
>> on
>> >>> port 179 I get a connection refuse msg, there is no access list on
>> SW1.
>> >>>
>> >>> R4#telnet 154.1.47.7
>> >>> Trying 154.1.47.7 ... Open
>> >>>
>> >>>
>> >>> User Access Verification
>> >>>
>> >>> Password:
>> >>>
>> >>> R4#telnet 154.1.47.7 179
>> >>> Trying 154.1.47.7, 179 ...
>> >>> % Connection refused by remote host
>> >>>
>> >>> SW1#
>> >>> 1d11h: tcp0: I LISTEN 154.1.47.4:18645 154.1.47.7:179 seq 2990396955
>> >>> OPTS 4 SYN WIN 4128
>> >>> 1d11h: TCP: sent RST to 154.1.47.4:18645 from 154.1.47.7:179
>> >>>
>> >>> SW1#sh run int vlan 47
>> >>> Building configuration...
>> >>>
>> >>> Current configuration : 61 bytes
>> >>> !
>> >>> interface Vlan47
>> >>> ip address 154.1.47.7 255.255.255.0
>> >>> end
>> >>>
>> >>> Any suggestion what is the issue, this is the only way I can test, any
>> >>> suggestion ?
>> >>>
>> >>> rgds
>> >>> Mahesh
>> >>>
>> >>>
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>> --
>> Charles
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