June 2004
Intermediate to advanced
1056 pages
39h 58m
English
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Name
traceroute
Synopsis
traceroute [options]host[packetsize]
Traces the route taken by packets to reach network host.
traceroute attempts tracing by launching UDP probe
packets with a small TTL (time to live), then listening for an ICMP
“time exceeded” reply from a
gateway. host is the destination hostname
or the IP number of host to reach.
packetsize
is the
packet size in bytes of the probe datagram. Default is 38 bytes.
Options
-
-d Turn on socket-level debugging.
-
-mmax_ttl Set maximum time-to-live used in outgoing probe packets to
max-ttlhops. Default is 30 hops.-
-n Show numerical addresses; don’t look up hostnames. (Useful if DNS is not functioning properly.)
-
-pport Set base UDP port number used for probe packets to
port. Default is (decimal) 33434.-
-qn Set number of probe packets for each time-to-live setting to the value
n. Default is 3.-
-r Bypass normal routing tables and send directly to a host on an attached network.
-
-ssrc_addr Use
src_addr-
-ttos Set the type-of-service in probe packets to
tos(default 0). The value must be a decimal integer in the range 0 to 255.-
-v Verbose; received ICMP packets (other than
TIME_EXCEEDEDandPORT_UNREACHABLE) will be listed.-
-wwait Set time to wait for a response to an outgoing probe packet to
waitseconds (default is three seconds).
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.