On Thu, Mar 27, 2014 at 8:24 AM, Steve Clark <sclark at netwolves.com> wrote: > Hi List, > > Hi Steve, > FYI. > > We have been using CentOS 6.4 and have 2 vpn/gre tunnels to separate cisco > rtrs using ospf. > with kernel 2.6.32-358.23.2 > > We have upgraded to 6.5 bit using kernel 2.6.32-431.5.1 and the exact same > configuration scripts for > our vpn/gre tunnels. > There was a brief thread (total of three posts) on multicast changes with the newer CentOS 6 kernel. http://lists.centos.org/pipermail/centos/2014-February/141062.html Apparently something odd going on in 2.6.32-431.x.x -- functionality that operates fine in the older 2.6.32-358.x.x kernels. > > What I see is the first gre tunnel works great and I get an ospf neighbor. > > The second tunnel comes up and I can ping across it and I see our side > sending hello packets in the gre tunnel > but I never receive any hello packets from the cisco. > > The cisco sees our hellos because it goes into the Init state. I do a > tcpdump > and I see esp traffic coming from the cisco like it is sending hellos but > they never show up in a tcpdump > on the gre tunnel. It is like the kernel is not delivering them. > > Also my gre tunnels on CentOS 6.5 are named gre1 at NONE and gre2 at NONE with > an ip a s, while on the 6.4 CentOS system > they show up as only gre1 and gre2? Whats with the @NONE? > > Looking at the Changelog of the kernel a lot of changes to the ip_gre > module were made in 2.6.32-380 > > Sounds like you might be aware of the post I linked to above. ( In case you're not, I'll send this message anyways. ) > > -- > Stephen Clark > *NetWolves Managed Services, LLC.* > Director of Technology > Phone: 813-579-3200 > Fax: 813-882-0209 > Email: steve.clark at netwolves.com > http://www.netwolves.com > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- ---~~.~~--- Mike // SilverTip257 //