Re: I'm missing 2 bytes (GRE implementation)

2011-08-10 Thread William Herrin
On Wed, Aug 10, 2011 at 12:36 PM, Daniel Roesen wrote: > On Wed, Aug 10, 2011 at 12:57:44AM +, Franck Martin wrote: >> I'm using a GRE IPv4 tunnel between a cisco and linux machines >> So why Cisco is off by 2 Bytes? > > The only GRE options using 2 bytes are GRE checksum and offset. Haven't >

Re: I'm missing 2 bytes (GRE implementation)

2011-08-10 Thread Daniel Roesen
On Wed, Aug 10, 2011 at 12:57:44AM +, Franck Martin wrote: > I'm using a GRE IPv4 tunnel between a cisco and linux machines Can you mail: IOS: - sh run int TuX - sh int TuX | i MTU - sh ip int TuX | i MTU Linux: - output of "/sbin/ip link show greX" (or whatever your GRE interface is named

Re: I'm missing 2 bytes (GRE implementation)

2011-08-09 Thread Stefan Fouant
Everything from checksums, keys, and sequence numbers is optional. The only required fields IIRC amount to 2 bytes of overhead. Sounds like they both interpret what should be included in the GRE header slightly differently. Stefan Fouant GPG Key ID: 0xB4C956EC Sent from my HTC EVO. - Rep