[Contents] [Prev] [Next] [Index] [Report an Error]

Rate Limiting for PPP Control Packets

The router implements rate limiting for PPP control packets to protect the corresponding PPP interface from denial-of-service (DoS) attacks. The interface discards control packets when the rate of control packets received exceeds the rate limit for PPP interfaces.

A PPP interface has a rate limit control that is non-configurable and always in effect; the rate limit is the same for all PPP interfaces. In addition, each interface instance maintains its own state and statistics counters for tracking the rate. The rate limit for PPP control packets is approximately 10 packets per second.

For a PPP interface, the router increments the discards counter in the show ppp interface command display to track the number of PPP control packets discarded on receipt (in) or discarded before they were transmitted (out) on this interface.

For examples of the show ppp interface command display, see show ppp interface.

[Contents] [Prev] [Next] [Index] [Report an Error]