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Ask the Expert- SD-WAN

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Beginner

Ping command result

Can somebody explain to me what is the output of this pattern of ping result?

1) U.U.U

2) UUUUU

3) .....

4) HHHHH

4 REPLIES 4
Enthusiast

Re: Ping command result

Hi,

Pls cover the CCNA book carefuly.

Rgds

Goutam S

Participant

Re: Ping command result

Hi. the U result is from an ICMP packet host unreachable, could be a result of route summarization if you are using EIGRP. Try a show IP route and see if the network you are trying to reach is in the routing table, if not check your routing IP protocols for summary enable, if so you can disable it with no auto-summary command.

As you study for your CCNA and CCNP exams, particularly if you're getting hands-on practice in your home lab or rack rental service, you're going to be sending a lot of pings. As a CCNA or CCNP candidate, you know that five exclamation points (!!!!!) as a ping return indicates that you have IP connectivity to the remote destination. Five periods (.....) indicates that you do not have that connectivity. The ping return of "U.U.U" is a general indication that the packets are indeed being transmitted, but that a downstream router is having a problem routing the packets.

HTH

Beginner

Re: Ping command result

Implementation of an ACL denying access to an interface/network would also bring this result.

Highlighted
Enthusiast

Re: Ping command result

"U" = Destinnation Unreachable

"." = The Network server/service timed out while waiting for a reply

"H" = Host unreachable

"P" = Protocol "

"N" = Network "

"!" = Receipt of a reply

"Q" = Source quench

"M" = Could not fragment

"?" = Unknown packet type

Hope it'll help you out.

Rgds

Goutam S

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