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Merge from release 5.1.
This commit is contained in:
Bill Fenner
parent
0ad74a38f4
commit
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@ -29,7 +29,7 @@
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.\" Copyright (c) 1988 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" $Id: mtrace.8,v 3.8.1.1 1996/11/10 22:24:15 fenner Exp $
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.\" mtrace.8,v 5.1 1996/12/19 21:31:26 fenner Exp
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.\"
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.TH MTRACE 8 "May 8, 1995"
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.UC 6
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@ -38,6 +38,9 @@ mtrace \- print multicast path from a source to a receiver
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.SH SYNOPSIS
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.B mtrace
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[
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.B \-e
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.I extrahops
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] [
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.B \-g
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.I gateway
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] [
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@ -48,15 +51,17 @@ mtrace \- print multicast path from a source to a receiver
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] [
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.B \-M
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] [
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.B \-T
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] [
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.B \-m
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.I max_hops
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] [
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.B \-n
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] [
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.B \-O
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] [
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.B \-p
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] [
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.B \-P
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] [
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.B \-q
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.I nqueries
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] [
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@ -71,6 +76,10 @@ mtrace \- print multicast path from a source to a receiver
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.B \-t
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.I ttl
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] [
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.B \-T
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] [
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.B \-U
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] [
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.B \-v
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] [
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.B \-w
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@ -86,9 +95,7 @@ mtrace \- print multicast path from a source to a receiver
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Assessing problems in the distribution of IP multicast traffic
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can be difficult.
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.B mtrace
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utilizes a tracing feature implemented in multicast routers
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.RB ( mrouted
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version 3.3 and later) that is
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utilizes a tracing feature implemented in multicast routers that is
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accessed via an extension to the IGMP protocol. A trace query is
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passed hop-by-hop along the reverse path from the
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.I receiver
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@ -124,6 +131,11 @@ NOTE: For Solaris 2.4/2.5, if the multicast interface is not the default
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interface, the -i option must be used to set the local address.
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.SH OPTIONS
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.TP 8 8
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.BI \-e\ extrahops
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Try tracing
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.I extrahops
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hops past a non-responding router.
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.TP 8 8
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.BI \-g\ gwy
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Send the trace query via unicast directly to the multicast router
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.I gwy
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@ -164,8 +176,8 @@ multicast path every 10 seconds (see
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.IR stat_int ).
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.TP 8 8
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.B \-M
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Always send the response using multicast rather than attempting
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unicast first.
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Always request the response using multicast rather than attempting
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unicast for the last half of the tries.
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.TP 8 8
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.BI \-m\ n
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Set to
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@ -186,10 +198,22 @@ Set the maximum number of query attempts for any hop to
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.IR n .
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The default is 3.
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.TP 8 8
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.B \-O
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Do not use the Router-Alert IP option on those requests which need it.
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Some versions of Cisco's IOS cannot handle
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multicast traceroutes with IP options, so it may be necessary to use the
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-O flag if the last-hop router is a Cisco.
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.TP 8 8
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.B \-p
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Listen passively for multicast responses from traces initiated by
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others. This works best when run on a multicast router.
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.TP 8 8
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.B \-P
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Loop indefinitely collecting the path every 10 seconds (see
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.B \-S
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.IR stat_int )
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and printing it when it changes. Do not print any statistics.
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.TP 8 8
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.BI \-r\ host
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Send the trace response to
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.I host
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@ -218,6 +242,10 @@ routers" multicast group which use ttl 1.
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"Tunnel statistics" mode; show loss rates for overall traffic.
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These statistics can be extremely misleading.
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.TP 8 8
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.B \-U
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Always request the response using unicast rather than attempting
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multicast first.
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.TP 8 8
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.B \-v
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Verbose mode; show hop times on the initial trace and statistics display.
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Also show the route that was used to forward the initial trace.
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@ -321,28 +349,40 @@ increasing by one until the full path is traced or no response is
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received. At each hop, multiple probes are sent (default is three,
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changed with
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.B \-q
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option). The first half of the attempts (default is one) are made with
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the unicast address of the host running
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.B mtrace
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as the destination for the response. Since the unicast route may be
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blocked, the remainder of attempts request that the response be
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multicast to mtrace.mcast.net (224.0.1.32) with the ttl set to 32 more
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than what's needed to pass the thresholds seen so far along the path
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to the receiver. For the last quarter of the attempts (default is
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one), the ttl is increased by another 32 each time up to a maximum of
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192. Alternatively, the ttl may be set explicitly with the
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option). The first half of the attempts (default is two) are made with
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the reply address set to standard multicast address, mtrace.mcast.net
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(224.0.1.32) with the ttl set to 32 more than what's needed to pass the
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thresholds seen so far along the path to the receiver. For each
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additional attempt, the ttl is increased by another 32 each time up to
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a maximum of 192. Since the desired router may not be able to send a
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multicast reply, the remainder of the attempts request that the
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response be sent via unicast to the host running
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.B mtrace .
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Alternatively, the multicast ttl may be set explicitly with the
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.B \-t
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option and/or the initial unicast attempts can be forced to use
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multicast instead with the
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option, the initial multicast attempts can be forced to use unicast
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instead with the
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.B \-U
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option, the final unicast attempts can be forced to use multicast
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isntead with the
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.B \-M
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option. For each attempt, if no response is received within the
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timeout, a "*" is printed. After the specified number of attempts
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have failed,
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option, or if you specify
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.B \-UM
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.B mtrace
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will first attempt using unicast and then multicast. For each attempt,
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if no response is received within the timeout, a "*" is printed. After
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the specified number of attempts have failed,
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.B mtrace
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will try to query the next hop router with a DVMRP_ASK_NEIGHBORS2
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request (as used by the
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.B mrinfo
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program) to see what kind of router it is.
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.B mtrace
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will try to query three (changed with the
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.B \-e
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option) hops past a non-responding router, in the hopes that even
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though it isn't capable of sending a response, it might be capable of
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forwarding the request on.
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.SH EXAMPLES
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The output of
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.B mtrace
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@ -511,7 +551,7 @@ in no response because there was a node running an old version of
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.B mrouted
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that did not implement the multicast traceroute function, so
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.B mtrace
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switched to hop-by-hop mode. The \*(lqRoute pruned\*(rq error code
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switched to hop-by-hop mode. The \*(lqOutput pruned\*(rq error code
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indicates that traffic for group 224.2.143.24 would not be forwarded.
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.PP
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.nf
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@ -521,7 +561,7 @@ oak.isi.edu 108# mtrace -g 140.173.48.2 204.62.246.73 \\
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Mtrace from 204.62.246.73 to 18.26.0.151 via group 224.2.143.24
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Querying full reverse path... * switching to hop-by-hop:
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0 butter.lcs.mit.edu (18.26.0.151)
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-1 jam.lcs.mit.edu (18.26.0.144) DVMRP thresh^ 1 33 ms Route pruned
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-1 jam.lcs.mit.edu (18.26.0.144) DVMRP thresh^ 1 33 ms Output pruned
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-2 bbn.dart.net (140.173.48.1) DVMRP thresh^ 1 36 ms
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-3 dc.dart.net (140.173.32.2) DVMRP thresh^ 1 44 ms
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-4 darpa.dart.net (140.173.240.2) DVMRP thresh^ 16 47 ms
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@ -545,3 +585,7 @@ program written by Van Jacobson.
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.BR mrinfo (8) ,
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.BR map-mbone (8) ,
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.BR traceroute (8)
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.SH BUGS
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.PP
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Statistics collection in passive mode doesn't always produce the same output
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as when actively collecting data.
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File diff suppressed because it is too large
Load Diff
@ -1,18 +1,10 @@
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# $Id: Makefile,v 1.3 1996/05/20 16:42:32 pst Exp $
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# $Id: Makefile,v 1.4 1996/06/24 04:25:22 jkh Exp $
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PROG= mtrace
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S= ${.CURDIR}/..
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.PATH: $S
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CFLAGS+= -I$S
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LDADD+= -lmrouted
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.if exists(${.OBJDIR}/../common)
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LDDESTDIR+= -L${.OBJDIR}/../common
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DPADD+= ${.OBJDIR}/../common/libmrouted.a
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.else
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LDDESTDIR+= -L$S/common
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DPADD+= $S/common/libmrouted.a
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.endif
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SRCS= mtrace.c
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MAN8= ${.CURDIR}/../mtrace.8
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