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The traceroute command fails rather than displays round-trip time or timing out, and an A appears in the output

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Core Issue

An A indicates that an Access Control List (ACL) is blocking the traceroute command traffic.

Resolution

Identify the last-hop router in the traceroute command output. Check for any ACL configured on the last-hop router or next routers on the path to the destination.

For a complete list of characters that can be displayed in the traceroute command output, refer to The Traceroute Command section of Understanding the Ping and Traceroute Commands.

Destination

Multiple devices on different network

What Can You Ping

Default gateway can ping destination