To disable PAD, use the no service pad command from the global configuration mode.
IP Source Routing
The Cisco IOS software examines IP header options on every packet and supports the IP header options, including Strict Source
Route, Loose Source Route, Record Route, and Time Stamp, defined in RFC 791. The IOS takes respective action as per RFC
standards when encountering a packet with one of these options enabled. When the IOS encounters a packet with an invalid
option, it sends out an Internet Control Message Protocol (ICMP) Parameter Problem message to the source of the packet and
discards the packet.
IP protocol allows the source IP host to specify a route through the IP network. This provision is known as source routing . Source
routing is specified as an option in the IP header. Source routing allows (or requires) the source of a packet to supply information
with the message that will influence the route of that message as it passes through the network. When source routing is
specified, the IOS forwards the packet according to the specified source route found in the message. This feature is employed force a packet to take a certain route through the network and not follow the route in the routing table.
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