On Wed, Jul 13, 2011 at 6:33 PM, Timothy Murphy <gayleard at eircom.net> wrote: > Tim Nelson wrote: > >> When VPN problems arise with specific applications, >> always look at MTU as a possible culprit. > > Thanks for the suggestion. > I should say that I am running OpenVPN on my system > with no problem at all. > Also the AT&T VPN apears to be running fine; > it is just the sametime program running over VPN > which is not working properly. > > Incidentally, what would you suggest as a possible MTU value? > And what is the simplest way to change the MTU on a CentOS server? > > -- > Timothy Murphy > e-mail: gayleard /at/ eircom.net > tel: +353-86-2336090, +353-1-2842366 > s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > I have only run Windows through the home routers. If I recall correctly (bad memory sometimes), I had to open port 500 (isakmp) for IPSEC to work.