ipv6 icmp source-route
By default, when the router drops a source-routed packet, it sends an ICMP Parameter Problem (type 4), Header Error (code 0) message to the packet's source address, pointing to the unrecognized routing type.
Global configuration mode
The IPv6 specification (RFC 2460) specifies support for IPv6 source-routed packets using a type 0 Routing extension header, requiring device and host to process the type 0 routing extension header. However, this requirement may leave a network open to a DoS attack. A security enhancement disables sending IPv6 source-routed packets to IPv6 devices. (This enhancement conforms to RFC 5095.)
By default, when the router drops a source-routed packet, it sends an ICMP Parameter Problem (type 4), Header Error (code 0) message to the packet's source address, pointing to the unrecognized routing type.
The
no form of the command disables the ICMP error messages for source routed IPv6 packet.