IP Services: Syslog, WCCP, ICMP

SYSLOG:

  • uses UDP port 514
  • use, logging <host> command and optionally, logging trap.
  • default facility of local7
  • e.g: “service timestamps log datetime localtime” à logging 192.168.1.100 à logging monitor informational.

WCCP:

· uses UDP port 2048

· upto 32 content engines can communicate with a single router using WCCPv1.

· The content engine with the LOWEST IP address is elected as the lead engine.

· WCCPv1, only ONE router can redirect traffic to a content engine or cluster of content engines. ONLY supports HTTP traffic (TCP port 80)

· WCCPv2, multiple routers and multiple content engines can be configured.

§ Supports TCP and UPD traffic other than port 80, including, FTP caching, FTP proxy, web caching for non 80 ports, real audio, video and telephony.

§ supports multicast.

§ provides MD5 security “ip wccp password password”

§ load distribution

§ transparent error handling.

§ default version is WCCPv2.

· Configuring

§ globally: ip wccp web-cache group-address <ip> password Cisco

§ redirecting traffic out: ip wccp web-cache redirect out ß to content engine

§ inbound traffic on interface is excluded from redirection: ip wccp redirect exclude in

ICMP:

· Echo Request: sent by a ping from the host to test node reachability

· Echo Reply: Indicates the node can be reached successfully.

· Redirect: sent by the router to the source host to stimulate more efficient routing

· Time Exceeded: sent by the router if an IP packet’s TTL filed reaches zero.

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