MTU settings best practices question

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by chriss_2, Oct 5, 2006.

  1. chriss_2

    chriss_2 Network Guru Member


    I have several users hooked up to our main office using various linksys VPN routers all around. Our main office has an RV082 and the remote users are connecting with either a BEFSX41 or BEFVP41.

    I have two questions about what is the best MTU settings for all these locations.

    1. Our main site has 2 WAN connections in load balancing mode. One is DSL (secondary) and one is a straight Ethernet handoff (primary). I can only set one MTU value in the RV082 though. What is the best setting for me to use in this case?

    2. Our remote user sites are either DSL or Cable modems. Should they use the same MTU value as our main site or should they use values appropriate to there actual physical connections? I guess a more simple version of this question is, should all VPN sites be using the same MTU value or is this not a good practice?

  2. d__l

    d__l Network Guru Member

    The remote sites should be set to Manual and the MTU size that is appropriate for that broadband connection. There is something about the Auto MTU setting on all Linksys routers that seems to cause problems. I'm not even certain why Linksys includes this setting as much trouble as it has caused.

    As for the RV082, you can set dual independant MTUs if you need to do so. The explanantion is here: but I'm not certain if these settings will be retained after a router reboot.
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