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Forum Replies

  1. Hello Chris

    Thanks for catching that, that’s great. Looking further into the issue, it is the case that UDP port 4342 is used by LISP, while 4343 is used by something called Unicall. I wasn’t able to find more information about Unitcall, however, there is extensive Cisco documentation that mentions that EIGRP OTP uses port 4343 and not 4342 for LISP. Extensive decodes and captures of exchange packets repeatedly indicate the use of 4343 in this related Cisco documentation concerning OTP architecture. (search for 4343). Additionally, unicall is mentioned as t

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  2. Like @lagapides, I tried to figure this out but I can’t find anything why they used UDP 4343. The official LISP ports that were assigned by IANA are 4341 and 4342. I guess they wanted to stay away from those two for EIGRP OTP, which is why they used 4343 instead.

    Unicall seems to be an old protocol:


    So there’s probably no harm using UDP 4343 instead.

  3. Hello Team,
    I try EIGRP OTP + IPSEC on a customer Network and it work well
    Can I use EIGRP OTP instead of DMVPN ?


  4. Hello Fabrice,

    This mostly depends on your transport network. If you use the Internet, you need to use something like DMVPN since you need to encapsulate your private traffic.

    If you have a private network and routing works between your endpoints, you can use EIGRP OTP or GETVPN.


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