Re: [tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-08-02 Thread Darren Reed
On 07/29/11 09:49, Guy Harris wrote: On Jul 27, 2011, at 3:02 AM, Darren Reed wrote: With Solaris, the interfaces available from the driver and protocol stack prohibit access to actual packets at the link layer. I don't know if this is or will be possible with Linux, but if the link layer he

Re: [tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-08-02 Thread Darren Reed
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Re: [tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-07-29 Thread Guy Harris
On Jul 27, 2011, at 3:02 AM, Darren Reed wrote: > With Solaris, the interfaces available from the driver and protocol stack > prohibit access to actual packets at the link layer. I don't know if this is > or will be possible with Linux, but if the link layer header for IPoIB on > Linux is 12 b

Re: [tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-07-29 Thread Darren Reed
Guy Harris wrote: On Jul 14, 2011, at 5:23 AM, Darren Reed wrote: Some more follow up on this... Looks are deceiving - there is no RFC 4391/4392 header being prepended to the IP packet: /* * In order to transmit the datagram to correct destination, an extra * header including destination a

Re: [tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-07-14 Thread Darren Reed
Guy Harris wrote: On Jul 14, 2011, at 5:23 AM, Darren Reed wrote: Some more follow up on this... Looks are deceiving - there is no RFC 4391/4392 header being prepended to the IP packet: /* * In order to transmit the datagram to correct destination, an extra * header including destination a

Re: [tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-07-14 Thread Guy Harris
On Jul 14, 2011, at 5:23 AM, Darren Reed wrote: > Some more follow up on this... > > Looks are deceiving - there is no RFC 4391/4392 header being prepended to the > IP packet: > /* > * In order to transmit the datagram to correct destination, an extra > * header including destination address is

Re: [tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-07-14 Thread Darren Reed
Some more follow up on this... Looks are deceiving - there is no RFC 4391/4392 header being prepended to the IP packet: /* * In order to transmit the datagram to correct destination, an extra * header including destination address is required. IB does not provide an * interface for sending a li

[tcpdump-workers] DLT value for IP over IB (Infiniband)

2011-07-13 Thread Darren Reed
Some time ago I requested a DLT value for the IP over IB format of IB frames. The interfaces that I'm using on Solaris appear to be compliant with RFCs 4391 and 4392. Currently we're using DLT_USER15 internally but given the alignment with the RFCs, I feel that this should be changed before I