Hi, What I thought was an MTU problem, now looks possibly to be an ospf issue.
I have 4.5 on one side and 4.7 on the other. At the moment this is the only infrastructure I can test on. I cant see anything obvious in the changelog that would stop me from testing on these platforms but If I have missed something other than 4.5 out of support life pls let me know. I have 2 sites linked via a gif tuinnel. site A has 1 client workstation (winxp) and 1 router (4.5 release) site B has 1 server (4.7 release) and 2 routers (1 is 4.7 release and 2 is 4.5 release) all routers are connected to the internet via pppoe(4) and have the default route set to the upstream. All routers are running ospfd site A router 1 (4.5) has a gif tunnel connected to site B router 1 (4.7) Default route on Site B server 1 (4.7) is Site B router 2 (4.5) As mentioned all three routers only are running ospfd. If I run tcpdump on all three routers and Site B server 1 to follow the traffic and then ping Site B server 1 from Site A client 1 I see the path Site A router 1 -> Site B router 1 -> Site B server 1 -> Site B router 2 -> Site B router 1 -> Site A router 1 -> site a Client 1. All completes and looks as I would expect. If I open an SSH client and try and ssh from Site A client 1 to Site B server1 I get the path Site A router 1 -> Site B router 1 -> Site B server 1 -> Site B router 2 and there it stops. I see the packet destined for the IP address of Site A client 1 but it never even reaches back to Site B router 1. I see the same behaviour with RDP connections to a different server at Site B. Similarly ping always complete OK If I change the default route of Site B server 1 from Site B router 2 to Site B router 1, in essence ( I believe) taking ospf out of the equation all ssh and rdp connections complete as well as the pings. If the answer is simply upgrade, then so be it but ideally I would prefer the ospf implementation project to occur prior to the next round of router updates. Any thoughts appreciated. Thanks, Steve --- On Fri, 4/3/11, Kenneth R Westerback <[email protected]> wrote: From: Kenneth R Westerback <[email protected]> Subject: Re: GRE pppoe MTU To: "Steve" <[email protected]> Cc: [email protected] Received: Friday, 4 March, 2011, 1:29 AM On Thu, Mar 03, 2011 at 05:06:02AM -0800, Steve wrote: > Hi all, > > Looking to implement ospf over ipsec and need gre in the mix to make it work. > Even leaving out IPSEC I have erratic communication over the gre tunnels. > Pings always Ok but rdp or http traffic is hit and miss. I have been assuming > an MTU issue. I have max-mss set at 1440 on the pppoe interface and have > randomly tried different mtu settings on gre interface down to 1240 with no > luck. > > Any thoughts would be appreciated. > > Thanks Any information on your hardware/software/network appreciated. e.g. are you running OpenBSD? .... Ken
