topic Hi Marvin,Excuse my so late in Network Security

Firewall check without PC Computer

OMÇiloğlu — Tue, 12 Mar 2019 08:06:14 GMT

Hello Cisco specialists,

I have a question regarding routers 6509 on testing of firewall rule between two?

I want to know is there any way a firewall rule without terminal / PC
to consider.

Only the Cisco device to Cisco equipment, it would give an my job very much!

My idea for example. Ping 10.20.30.1: Port 22

or traceroute 10.20.30.1: 8080

Thank you very much.

We often use telnet between

Marvin Rhoads — Tue, 09 Aug 2016 00:14:20 GMT

We often use telnet between two network devices to ascertain whether a given tcp port is permitted. You do need to have a service on the remote device listening on the port so it's limited in that sense.

For example:

telnet <remote address> <remote port>

Ping (and traceroute which build on ping) is icmp - not tcp or udp and as such does not use port numbers. It also does not establish a 3-way handshake TCP does and thus can give one a false sense of connectivity when there is asymmetric routing involved.

Hi Marvin,Excuse my so late

OMÇiloğlu — Thu, 11 Aug 2016 12:57:27 GMT

Hi Marvin,

Excuse my so late reply.
I thank you, it is very helpful.
Thus I have not counted on the yarn, the devices support also something

Excuse my bad Englich