Annotation of embedaddon/mrouted/mtrace.8, revision 1.1
1.1 ! misho 1: .\" $OpenBSD: mtrace.8,v 1.16 2010/03/26 19:30:40 jmc Exp $
! 2: .\" $NetBSD: mtrace.8,v 1.4 1995/12/10 10:57:11 mycroft Exp $
! 3: .\"
! 4: .\" Copyright (c) 1993, 1998-2001.
! 5: .\" The University of Southern California/Information Sciences Institute.
! 6: .\" All rights reserved.
! 7: .\"
! 8: .\" Redistribution and use in source and binary forms, with or without
! 9: .\" modification, are permitted provided that the following conditions
! 10: .\" are met:
! 11: .\" 1. Redistributions of source code must retain the above copyright
! 12: .\" notice, this list of conditions and the following disclaimer.
! 13: .\" 2. Redistributions in binary form must reproduce the above copyright
! 14: .\" notice, this list of conditions and the following disclaimer in the
! 15: .\" documentation and/or other materials provided with the distribution.
! 16: .\" 3. Neither the name of the project nor the names of its contributors
! 17: .\" may be used to endorse or promote products derived from this software
! 18: .\" without specific prior written permission.
! 19: .\"
! 20: .\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
! 21: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: .\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
! 24: .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: .\" SUCH DAMAGE.
! 31: .\"
! 32: .\" Other copyrights might apply to parts of this software and are so
! 33: .\" noted when applicable.
! 34: .\"
! 35: .\" This manual page (but not the software) was derived from the
! 36: .\" manual page for the traceroute program which bears the following
! 37: .\" copyright notice:
! 38: .\"
! 39: .\" Copyright (c) 1988 The Regents of the University of California.
! 40: .\" All rights reserved.
! 41: .\"
! 42: .\" This code is derived from software contributed to Berkeley by
! 43: .\" Van Jacobson.
! 44: .\"
! 45: .\" Redistribution and use in source and binary forms, with or without
! 46: .\" modification, are permitted provided that the following conditions
! 47: .\" are met:
! 48: .\" 1. Redistributions of source code must retain the above copyright
! 49: .\" notice, this list of conditions and the following disclaimer.
! 50: .\" 2. Redistributions in binary form must reproduce the above copyright
! 51: .\" notice, this list of conditions and the following disclaimer in the
! 52: .\" documentation and/or other materials provided with the distribution.
! 53: .\" 3. Neither the name of the University nor the names of its contributors
! 54: .\" may be used to endorse or promote products derived from this software
! 55: .\" without specific prior written permission.
! 56: .\"
! 57: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 58: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 59: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 60: .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 61: .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 62: .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 63: .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 64: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 65: .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 66: .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 67: .\" SUCH DAMAGE.
! 68: .\"
! 69: .Dd $Mdocdate: March 26 2010 $
! 70: .Dt MTRACE 8 SMM
! 71: .Os
! 72: .Sh NAME
! 73: .Nm mtrace
! 74: .Nd print multicast path from a source to a receiver
! 75: .Sh SYNOPSIS
! 76: .Nm mtrace
! 77: .Op Fl lMnpsv
! 78: .Op Fl g Ar gateway
! 79: .Op Fl i Ar if_addr
! 80: .Op Fl m Ar max_hops
! 81: .Op Fl q Ar nqueries
! 82: .Op Fl r Ar host
! 83: .Op Fl S Ar stat_int
! 84: .Op Fl t Ar ttl
! 85: .Op Fl w Ar waittime
! 86: .Ar source
! 87: .Op Ar receiver
! 88: .Op Ar group
! 89: .Sh DESCRIPTION
! 90: Assessing problems in the distribution of IP multicast traffic
! 91: can be difficult.
! 92: .Nm
! 93: utilizes a tracing feature implemented in multicast routers
! 94: .Pf ( Nm mrouted
! 95: version 3.3 and later) that is
! 96: accessed via an extension to the IGMP protocol.
! 97: A trace query is passed hop-by-hop along the reverse path from the
! 98: .Ar receiver
! 99: to the
! 100: .Ar source ,
! 101: collecting hop addresses, packet counts, and routing error conditions
! 102: along the path, and then the response is returned to the requestor.
! 103: .Pp
! 104: The only required parameter is the
! 105: .Ar source
! 106: host name or address.
! 107: The default
! 108: .Ar receiver
! 109: is the host running mtrace, and the default
! 110: .Ar group
! 111: is "MBone Audio" (224.2.0.1), which is sufficient if packet loss
! 112: statistics for a particular multicast group are not needed.
! 113: These two optional parameters may be specified to test the path to some other
! 114: receiver in a particular group, subject to some constraints as
! 115: detailed below.
! 116: The two parameters can be distinguished because the
! 117: .Ar receiver
! 118: is a unicast address and the
! 119: .Ar group
! 120: is a multicast address.
! 121: .Pp
! 122: The options are as follows:
! 123: .Bl -tag -width addr_xy
! 124: .It Fl g Ar gateway
! 125: Send the trace query via unicast directly to the multicast router
! 126: .Ar gateway
! 127: rather than multicasting the query.
! 128: This must be the last-hop router on the path from the intended
! 129: .Ar source
! 130: to the
! 131: .Ar receiver .
! 132: .Em NOTE: Read the BUGS section below.
! 133: .It Fl i Ar if_addr
! 134: Use
! 135: .Ar if_addr
! 136: as the local interface address (on a multi-homed host) for sending the
! 137: trace query and as the default for the
! 138: .Ar receiver
! 139: and the response destination.
! 140: .It Fl l
! 141: Loop indefinitely printing packet rate and loss statistics for the
! 142: multicast path every 10 seconds (see
! 143: .Fl S Ar stat_int ) .
! 144: .It Fl M
! 145: Always send the response using multicast rather than attempting
! 146: unicast first.
! 147: .It Fl m Ar max_hops
! 148: Set to
! 149: the maximum number of hops that will be traced from the
! 150: .Ar receiver
! 151: back toward the
! 152: .Ar source .
! 153: The default is 32 hops (infinity for the DVMRP routing protocol).
! 154: .It Fl n
! 155: Print hop addresses numerically rather than symbolically and numerically
! 156: (saves a nameserver address-to-name lookup for each router found on the
! 157: path).
! 158: .It Fl p
! 159: Listen passively for multicast responses from traces initiated by others.
! 160: This works best when run on a multicast router.
! 161: .It Fl q Ar nqueries
! 162: Set the maximum number of query attempts for any hop to
! 163: .Ar nqueries .
! 164: The default is 3.
! 165: .It Fl r Ar host
! 166: Send the trace response to
! 167: .Ar host
! 168: rather than to the host on which
! 169: .Nm
! 170: is being run, or to a multicast address other than the one registered
! 171: for this purpose (224.0.1.32).
! 172: .It Fl S Ar stat_int
! 173: Change the interval between statistics gathering traces to
! 174: .Ar stat_int
! 175: seconds (default 10 seconds).
! 176: .It Fl s
! 177: Print a short form output including only the multicast path and not
! 178: the packet rate and loss statistics.
! 179: .It Fl t Ar ttl
! 180: Set the
! 181: .Ar ttl
! 182: (time-to-live, or number of hops) for multicast trace queries and
! 183: responses.
! 184: The default is 64, except for local queries to the
! 185: "all routers" multicast group which use ttl 1.
! 186: .It Fl v
! 187: Verbose mode; show hop times on the initial trace and statistics display.
! 188: .It Fl w Ar waittime
! 189: Set the time to wait for a trace response to
! 190: .Ar waittime
! 191: seconds (default 3 seconds).
! 192: .El
! 193: .Ss How \&It Works
! 194: The technique used by the
! 195: .Nm traceroute
! 196: tool to trace unicast network paths will not work for IP multicast
! 197: because ICMP responses are specifically forbidden for multicast traffic.
! 198: Instead, a tracing feature has been built into the multicast routers.
! 199: This technique has the advantage that additional information about
! 200: packet rates and losses can be accumulated while the number of packets
! 201: sent is minimized.
! 202: .Pp
! 203: Since multicast uses
! 204: reverse path forwarding, the trace is run backwards from the
! 205: .Ar receiver
! 206: to the
! 207: .Ar source .
! 208: A trace query packet is sent to the last
! 209: hop multicast router (the leaf router for the desired
! 210: .Ar receiver
! 211: address).
! 212: The last hop router builds a trace response packet, fills in
! 213: a report for its hop, and forwards the trace packet using unicast to
! 214: the router it believes is the previous hop for packets originating
! 215: from the specified
! 216: .Ar source .
! 217: Each router along the path adds its report and forwards the packet.
! 218: When the trace response packet reaches the first hop router (the router
! 219: that is directly connected to the source's net), that router sends the
! 220: completed response to the response destination address specified in
! 221: the trace query.
! 222: .Pp
! 223: If some multicast router along the path does not implement the
! 224: multicast traceroute feature or if there is some outage, then no
! 225: response will be returned.
! 226: To solve this problem, the trace query includes a maximum hop count field
! 227: to limit the number of hops traced before the response is returned.
! 228: That allows a partial path to be traced.
! 229: .Pp
! 230: The reports inserted by each router contain not only the address of
! 231: the hop, but also the ttl required to forward and some flags to indicate
! 232: routing errors, plus counts of the total number of packets on the
! 233: incoming and outgoing interfaces and those forwarded for the specified
! 234: .Ar group .
! 235: Taking differences in these counts for two traces separated in time
! 236: and comparing the output packet counts from one hop with the input
! 237: packet counts of the next hop allows the calculation of packet rate
! 238: and packet loss statistics for each hop to isolate congestion
! 239: problems.
! 240: .Ss Finding the Last-Hop Router
! 241: The trace query must be sent to the multicast router which is the
! 242: last hop on the path from the
! 243: .Ae source
! 244: to the
! 245: .Ar receiver .
! 246: If the
! 247: .Ar receiver
! 248: is on the local subnet (as determined using the subnet
! 249: mask), then the default method is to multicast the trace query to
! 250: all-routers.mcast.net (224.0.0.2) with a ttl of 1.
! 251: Otherwise, the trace query is multicast to the
! 252: .Ar group
! 253: address since the last hop router will be a member of that group if
! 254: the
! 255: .Ar receiver
! 256: is.
! 257: Therefore it is necessary to specify a
! 258: .Ar group
! 259: that the intended
! 260: .Ar receiver
! 261: is joined.
! 262: This multicast is sent with a default ttl of 64, which may not be sufficient
! 263: for all cases (changed with the
! 264: .Fl t
! 265: option).
! 266: If the last hop router is known, it may also be addressed directly
! 267: using the
! 268: .Fl g
! 269: option).
! 270: Alternatively, if it is desired to trace a group that the
! 271: .Ar receiver
! 272: has not joined, but it is known that the last-hop router is a
! 273: member of another group, the
! 274: .Fl g
! 275: option may also be used to specify a different multicast address for the
! 276: trace query.
! 277: .Pp
! 278: When tracing from a multihomed host or router, the default
! 279: .Ar receiver
! 280: address may not be the desired interface for the path from the
! 281: .Ar source .
! 282: In that case, the desired interface should be specified explicitly as
! 283: the
! 284: .Ar receiver .
! 285: .Ss Directing the Response
! 286: By default,
! 287: .Nm
! 288: first attempts to trace the full reverse path, unless the number of
! 289: hops to trace is explicitly set with the
! 290: .Fl m
! 291: option.
! 292: If there is no response within a 3 second timeout interval
! 293: (changed with the
! 294: .Fl m
! 295: option), a "*" is printed and the probing switches to hop-by-hop mode.
! 296: Trace queries are issued starting with a maximum hop count of one and
! 297: increasing by one until the full path is traced or no response is
! 298: received.
! 299: At each hop, multiple probes are sent (default is three, changed with
! 300: .Fl q
! 301: option).
! 302: The first half of the attempts (default is one) are made with
! 303: the unicast address of the host running
! 304: .Nm
! 305: as the destination for the response.
! 306: Since the unicast route may be blocked, the remainder of attempts request
! 307: that the response be multicast to mtrace.mcast.net (224.0.1.32) with the
! 308: ttl set to 32 more than what's needed to pass the thresholds seen so far
! 309: along the path to the
! 310: .Ar receiver .
! 311: For the last quarter of the attempts (default is
! 312: one), the ttl is increased by another 32 each time up to a maximum of 192.
! 313: Alternatively, the ttl may be set explicitly with the
! 314: .Fl t
! 315: option and/or the initial unicast attempts can be forced to use
! 316: multicast instead with the
! 317: .Fl m
! 318: option.
! 319: For each attempt, if no response is received within the timeout,
! 320: a "*" is printed.
! 321: After the specified number of attempts have failed,
! 322: .Nm
! 323: will try to query the next hop router with a DVMRP_ASK_NEIGHBORS2
! 324: request (as used by the
! 325: .Nm mrinfo
! 326: program) to see what kind of router it is.
! 327: .Sh EXAMPLES
! 328: The output of
! 329: .Nm
! 330: is in two sections.
! 331: The first section is a short listing of the hops in the order they are
! 332: queried, that is, in the reverse of the order from the
! 333: .Ae source
! 334: to the
! 335: .Ae receiver .
! 336: For each hop, a line is printed showing the hop number (counted
! 337: negatively to indicate that this is the reverse path); the multicast
! 338: routing protocol (DVMRP, MOSPF, PIM, etc.); the threshold required to
! 339: forward data (to the previous hop in the listing as indicated by the
! 340: up-arrow character); and the cumulative delay for the query to reach
! 341: that hop (valid only if the clocks are synchronized).
! 342: This first section ends with a line showing the round-trip time which measures
! 343: the interval from when the query is issued until the response is
! 344: received, both derived from the local system clock.
! 345: A sample use and output might be:
! 346: .Bd -literal
! 347: oak.isi.edu 80# mtrace -l caraway.lcs.mit.edu 224.2.0.3
! 348: Mtrace from 18.26.0.170 to 128.9.160.100 via group 224.2.0.3
! 349: Querying full reverse path...
! 350: 0 oak.isi.edu (128.9.160.100)
! 351: -1 cub.isi.edu (128.9.160.153) DVMRP thresh^ 1 3 ms
! 352: -2 la.dart.net (140.173.128.1) DVMRP thresh^ 1 14 ms
! 353: -3 dc.dart.net (140.173.64.1) DVMRP thresh^ 1 50 ms
! 354: -4 bbn.dart.net (140.173.32.1) DVMRP thresh^ 1 63 ms
! 355: -5 mit.dart.net (140.173.48.2) DVMRP thresh^ 1 71 ms
! 356: -6 caraway.lcs.mit.edu (18.26.0.170)
! 357: Round trip time 124 ms
! 358: .Ed
! 359: .Pp
! 360: The second section provides a pictorial view of the path in the
! 361: forward direction with data flow indicated by arrows pointing downward
! 362: and the query path indicated by arrows pointing upward.
! 363: For each hop, both the entry and exit addresses of the router are shown if
! 364: different, along with the initial ttl required on the packet in order
! 365: to be forwarded at this hop and the propagation delay across the hop
! 366: assuming that the routers at both ends have synchronized clocks.
! 367: The right half of this section is composed of several columns of
! 368: statistics in two groups.
! 369: Within each group, the columns are the number of packets lost, the number
! 370: of packets sent, the percentage lost, and the average packet rate at each hop.
! 371: These statistics are calculated from differences between traces and from
! 372: hop to hop as explained above.
! 373: The first group shows the statistics for all traffic flowing out the interface
! 374: at one hop and in the interface at the next hop.
! 375: The second group shows the statistics only for traffic forwarded
! 376: from the specified
! 377: .Ar source
! 378: to the specified
! 379: .Ar group .
! 380: .Pp
! 381: These statistics are shown on one or two lines for each hop.
! 382: Without any options, this second section of the output is printed only once,
! 383: approximately 10 seconds after the initial trace.
! 384: One line is shown for each hop showing the statistics over that 10-second
! 385: period.
! 386: If the
! 387: .Fl l
! 388: option is given, the second section is repeated every 10 seconds and
! 389: two lines are shown for each hop.
! 390: The first line shows the statistics for the last 10 seconds, and the second
! 391: line shows the cumulative statistics over the period since the initial trace,
! 392: which is 101 seconds in the example below.
! 393: The second section of the output is omitted if the
! 394: .Fl s .
! 395: option is set.
! 396: .Bd -literal
! 397: Waiting to accumulate statistics... Results after 101 seconds:
! 398:
! 399: Source Response Dest Packet Statistics For Only For Traffic
! 400: 18.26.0.170 128.9.160.100 All Multicast Traffic From 18.26.0.170
! 401: | __/ rtt 125 ms Lost/Sent = Pct Rate To 224.2.0.3
! 402: v / hop 65 ms --------------------- ------------------
! 403: 18.26.0.144
! 404: 140.173.48.2 mit.dart.net
! 405: | ^ ttl 1 0/6 = --% 0 pps 0/2 = --% 0 pps
! 406: v | hop 8 ms 1/52 = 2% 0 pps 0/18 = 0% 0 pps
! 407: 140.173.48.1
! 408: 140.173.32.1 bbn.dart.net
! 409: | ^ ttl 2 0/6 = --% 0 pps 0/2 = --% 0 pps
! 410: v | hop 12 ms 1/52 = 2% 0 pps 0/18 = 0% 0 pps
! 411: 140.173.32.2
! 412: 140.173.64.1 dc.dart.net
! 413: | ^ ttl 3 0/271 = 0% 27 pps 0/2 = --% 0 pps
! 414: v | hop 34 ms -1/2652 = 0% 26 pps 0/18 = 0% 0 pps
! 415: 140.173.64.2
! 416: 140.173.128.1 la.dart.net
! 417: | ^ ttl 4 -2/831 = 0% 83 pps 0/2 = --% 0 pps
! 418: v | hop 11 ms -3/8072 = 0% 79 pps 0/18 = 0% 0 pps
! 419: 140.173.128.2
! 420: 128.9.160.153 cub.isi.edu
! 421: | \e__ ttl 5 833 83 pps 2 0 pps
! 422: v \e hop -8 ms 8075 79 pps 18 0 pps
! 423: 128.9.160.100 128.9.160.100
! 424: Receiver Query Source
! 425: .Ed
! 426: .Pp
! 427: Because the packet counts may be changing as the trace query is
! 428: propagating, there may be small errors (off by 1 or 2) in these
! 429: statistics.
! 430: However, those errors should not accumulate, so the cumulative statistics
! 431: line should increase in accuracy as a new trace is run every 10 seconds.
! 432: There are two sources of larger errors,
! 433: both of which show up as negative losses:
! 434: .Bl -bullet -offset abcd
! 435: .It
! 436: If the input to a node is from a multi-access network with more than
! 437: one other node attached, then the input count will be (close to) the
! 438: sum of the output counts from all the attached nodes, but the output
! 439: count from the previous hop on the traced path will be only part of
! 440: that.
! 441: Hence the output count minus the input count will be negative.
! 442: .It
! 443: In release 3.3 of the DVMRP multicast forwarding software for SunOS
! 444: and other systems, a multicast packet generated on a router will be
! 445: counted as having come in an interface even though it did not.
! 446: This creates the negative loss that can be seen in the example above.
! 447: .El
! 448: .Pp
! 449: Note that these negative losses may mask positive losses.
! 450: .Pp
! 451: In the example, there is also one negative hop time.
! 452: This simply indicates a lack of synchronization between the system clocks
! 453: across that hop.
! 454: This example also illustrates how the percentage loss is
! 455: shown as two dashes when the number of packets sent is less than 10
! 456: because the percentage would not be statistically valid.
! 457: .Pp
! 458: A second example shows a trace to a
! 459: .Ar receiver
! 460: that is not local; the query is sent to the last-hop router with the
! 461: .Fl g
! 462: option.
! 463: In this example, the trace of the full reverse path resulted
! 464: in no response because there was a node running an old version of
! 465: .Nm mrouted
! 466: that did not implement the multicast traceroute function, so
! 467: .Nm
! 468: switched to hop-by-hop mode.
! 469: The "Route pruned" error code indicates that traffic for group 224.2.143.24
! 470: would not be forwarded.
! 471: .Bd -literal
! 472: oak.isi.edu 108# mtrace -g 140.173.48.2 204.62.246.73 \e
! 473: butter.lcs.mit.edu 224.2.143.24
! 474: Mtrace from 204.62.246.73 to 18.26.0.151 via group 224.2.143.24
! 475: Querying full reverse path... * switching to hop-by-hop:
! 476: 0 butter.lcs.mit.edu (18.26.0.151)
! 477: -1 jam.lcs.mit.edu (18.26.0.144) DVMRP thresh^ 1 33 ms Route pruned
! 478: -2 bbn.dart.net (140.173.48.1) DVMRP thresh^ 1 36 ms
! 479: -3 dc.dart.net (140.173.32.2) DVMRP thresh^ 1 44 ms
! 480: -4 darpa.dart.net (140.173.240.2) DVMRP thresh^ 16 47 ms
! 481: -5 * * * noc.hpc.org (192.187.8.2) [mrouted 2.2] didn't respond
! 482: Round trip time 95 ms
! 483: .Ed
! 484: .Sh SEE ALSO
! 485: .Xr map-mbone 8 ,
! 486: .Xr mrinfo 8 ,
! 487: .Xr mrouted 8 ,
! 488: .Xr traceroute 8
! 489: .Sh AUTHORS
! 490: Implemented by Steve Casner based on an initial prototype written by
! 491: Ajit Thyagarajan.
! 492: The multicast traceroute mechanism was designed by
! 493: Van Jacobson with help from Steve Casner, Steve Deering, Dino
! 494: Farinacci, and Deb Agrawal; it was implemented in
! 495: .Nm mrouted
! 496: by Ajit Thyagarajan and Bill Fenner.
! 497: The option syntax and the output format of
! 498: .Nm
! 499: are modeled after the unicast
! 500: .Nm traceroute
! 501: program written by Van Jacobson.
! 502: .Sh BUGS
! 503: Versions 3.3 and 3.5 of
! 504: .Nm mrouted
! 505: will crash if a trace query is received via a
! 506: unicast packet and
! 507: .Nm mrouted
! 508: has no route for the
! 509: .Ar source
! 510: address.
! 511: Therefore, do not use the
! 512: .Fl g
! 513: option unless the target
! 514: .Nm mrouted
! 515: has been verified to be 3.4 or newer than 3.5.
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