private address in traceroute results

Posted by misteryes on Super User See other posts from Super User or by misteryes
Published on 2013-06-25T10:03:46Z Indexed on 2013/06/25 10:23 UTC
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Filed under:

networking

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routing

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traceroute

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private-network

I use traceroute to check paths on a remote host, and I notice that there are some private IPs, like 10.230.10.1

    bash-4.0# traceroute -T 132.227.62.122
    traceroute to 132.227.62.122 (132.227.62.122), 30 hops max, 60 byte packets 
     1  194.199.68.161 (194.199.68.161)  1.103 ms  1.107 ms  1.097 ms
     2  sw-ptu.univ.run (10.230.10.1)  1.535 ms  1.625 ms  2.172 ms
     3  sw-univ-gazelle.univ.run (10.10.20.1)  6.891 ms  6.937 ms  6.927 ms
     4  10.10.5.6 (10.10.5.6)  1.544 ms  1.517 ms  1.518 ms

why there are private addresses near the host?

what are the purposes that these private addresses are used? I mean why they want to put the public IP behind private IPs?

thanks!

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