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  • 1.  Ping without source ip unreachable, but ping with source ip is reachable

    This message was posted by a user wishing to remain anonymous
    Posted 09-05-2023 08:54
    This message was posted by a user wishing to remain anonymous

    I face a problem, that our router as PE cannot do ping without using ip source. When ping using ip source is success

    180.240.180.7 is IP Loopback

     @PE3-ID-DCI.CKR-TCX> ping 8.8.8.8

    PING 8.8.8.8 (8.8.8.8): 56 data bytes

    ^C

    --- 8.8.8.8 ping statistics --- 2 packets transmitted, 0 packets received, 100% packet loss

    @PE3-ID-DCI.CKR-TCX> ping 8.8.8.8 source 180.240.180.7

    PING 8.8.8.8 (8.8.8.8): 56 data bytes

    64 bytes from 8.8.8.8: icmp_seq=0 ttl=251 time=16.282 ms

    64 bytes from 8.8.8.8: icmp_seq=1 ttl=251 time=16.276 ms

    64 bytes from 8.8.8.8: icmp_seq=2 ttl=251 time=16.393 ms

    64 bytes from 8.8.8.8: icmp_seq=3 ttl=251 time=16.340 ms

    --- 8.8.8.8 ping statistics --- 6 packets transmitted, 6 packets received,

    0% packet loss round-trip min/avg/max/stddev = 16.244/16.299/16.393/0.052 ms

    @PE3-ID-DCI.CKR-TCX> traceroute 8.8.8.8

     traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 52 byte packets

    1 180.240.196.34 (180.240.196.34) 1.396 ms 0.595 ms 0.942 ms

    2 180.240.192.185 (180.240.192.185) 1.777 ms 1.913 ms 1.512 ms

    3 * * *

    4 *^C 

    @PE3-ID-DCI.CKR-TCX> traceroute 8.8.8.8 source 180.240.180.7

    traceroute to 8.8.8.8 (8.8.8.8) from 180.240.180.7, 30 hops max, 52 byte packets

    1 180.240.196.34 (180.240.196.34) 0.611 ms 0.653 ms 1.191 ms

    2 180.240.192.185 (180.240.192.185) 1.764 ms 1.646 ms 1.643 ms

    3 180.240.192.53 (180.240.192.53) 2.411 ms 3.102 ms 2.839 ms

    4 8.8.8.8 (8.8.8.8) 16.779 ms 18.517 ms 16.429 ms

    firewall rules are in place to allow ICMP traffic.

    is there something i miss?



  • 2.  RE: Ping without source ip unreachable, but ping with source ip is reachable

    Posted 09-05-2023 08:56

    The default address used for ping or other protocols is based on a combination of the routing tables created, routes installed and all the available ip addresses on the device.  There are times when this default selection of address makes the destination unreachable and specifying a source is needed for reachability.



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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
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