nanog mailing list archives
RE: IPIP-tunnel with 1500 MTU
From: Mikael Abrahamsson <swmike () swm pp se>
Date: Thu, 11 Jan 2001 20:37:15 +0100 (CET)
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: swmike () swm pp se
Current thread:
- IPIP-tunnel with 1500 MTU Mikael Abrahamsson (Feb 24)
- Re: IPIP-tunnel with 1500 MTU Valdis . Kletnieks (Feb 24)
- Re: IPIP-tunnel with 1500 MTU Mikael Abrahamsson (Feb 24)
- RE: IPIP-tunnel with 1500 MTU Craig Holland (Feb 24)
- <Possible follow-ups>
- RE: IPIP-tunnel with 1500 MTU Mikael Abrahamsson (Feb 24)
- Re: IPIP-tunnel with 1500 MTU Stephen Sprunk (Feb 24)
- Re: IPIP-tunnel with 1500 MTU Mikael Abrahamsson (Feb 24)
- Re: IPIP-tunnel with 1500 MTU Valdis . Kletnieks (Feb 24)