North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: IPIP-tunnel with 1500 MTU
On Thu, 11 Jan 2001, Bulger, Tim wrote: > There is an 'ip mtu' option in the tunnel interface config on Cisco routers > that you can set to 1500.. This will cause the tunnel packets themselves to > be ip fragmented outbound on the router, hence shifting the fragmentation > away from your internal network packets and over to the tunnel packets. I > know that this works with GRE and IP/IP on Cisco routers running 12.x code. (config-if)#tunnel mode gre ip (config-if)#mtu 1500 % Interface Tunnel1 does not support adjustable maximum datagram size I believe this is only true if you have serial links that support MTU > 1500 all the way between the two routers doing the tunneling, right? -- Mikael Abrahamsson email: [email protected]
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