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Full Discussion: Route get output
Special Forums IP Networking Route get output Post 302949847 by Ultrix on Thursday 16th of July 2015 02:35:46 PM
Old 07-16-2015
Route get output

I'm having some trouble understanding the output of the route command. Specifically, the "route to" and "destination" fields. I'm guessing "route to: <address>" means when the queried host receives packets, it sends them to <address> by default, and "destination: <address>" means <address> is the destination for packets routed by that host. But these two fields seem to always be the same. What exactly is the difference between them?

I queried localhost and got the following output:

Code:
   route to: localhost
destination: localhost
  interface: lo0
      flags: <UP,HOST,DONE,LOCAL>
 recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire
   49152     49152         0         0         0         0     16384         0

I queried what I thought was the local router/DNS server/DHCP server, obtained through nslookup, and I got this:

Code:
   route to: cdns01.comcast.net
destination: cdns01.comcast.net
    gateway: 10.90.30.1
  interface: en1
      flags: <UP,GATEWAY,HOST,DONE,WASCLONED,IFSCOPE,IFREF>
 recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire
       0         0         0         0         0         0      1500         0

I did a traceroute on the same IP address and found it to be five router hops away, in a completely different city. I thought the local DNS server was usually on the local router. I don't recall changing it at any point.

I also noticed that "route to" and "destination" are both set to the hostname for the host queried, meaning the routing table for Host A has Host A as both the route to value and the destination value.

Could someone please explain this to me? I'm very confused.

Also, are "interface" and "gateway" the interface and gateway for the queried host, or are they the interface and gateway that my computer uses to connect to the queried host?

Also, I am on a business LAN, not a home network. I don't know if that makes any difference.
 

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MAKE_SOCKDFR(8) 					      System Manager's Manual						   MAKE_SOCKDFR(8)

NAME
make_sockdfr - Generates frozen route file for SOCKS server SYNOPSIS
make_sockdfr [infile [outfile] ] DESCRIPTION
make_sockdfr reads in a plain-text route file for the SOCKS server and produces a frozen route file as the output. Both arguments are optional. The default for infile is /etc/sockd.route; the default for outfile is /etc/sockd.fr. You may specify infile while omitting outfile, but you cannot specify outfile without also speficying infile. The contents of the frozen route file is essentially the memory image of the parsed input file. Using the frozen route file can reduce the start-up delay of the SOCKS server program since it no longer has to parse the file contents. When the SOCKS server starts, it always looks for the frozen route file /etc/sockd.fr first. If that file is not found, it then tries to use the plain-text route file /etc/sockd.route. If you use frozen route file, you must remember to run make_sockdfr every time after you modify the plain-text file or the SOCKS server will continue to use the frozen version of a previous route file. To find out the contents of a frozen route file, use dump_sockdfr. FILES
/etc/sockd.fr, /etc/sockd.route SEE ALSO
dump_sockdfr(8), sockd.fr(5), sockd.route(5) AUTHOR
Ying-Da Lee, yingda@esd.sgi.com or yingda@best.com May 6, 1996 MAKE_SOCKDFR(8)
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