Prashant, > On 9 Nov 2018, at 01:39, Prashant Upadhyaya <praupadhy...@gmail.com> wrote: > > Hi Ole, > > Thanks for the information. > > Suppose my IP datagram gets fragmented into fragments F.1 and F.2, do > these again get submitted to ip4-input ? > I am trying to figure out the path in the graph from the time I submit > my v4 IP datagram to ip4-lookup. > What is crucial for me to know is if the fragments do land up at > ip4-input or not.
They don’t. If I recall correctly fragmentation is done in ip4-rewrite, and that’s were fragments end up after a trip by ip4-frag. Packet trace is your friend here. (trace add <input graph node> <no-packets> Send large packet show trace) Cheers Ole > > Regards > -Prashant > > >> On Thu, Nov 8, 2018 at 10:11 PM Ole Troan <otr...@employees.org> wrote: >> >> >> >>> On 8 Nov 2018, at 23:26, Prashant Upadhyaya <praupadhy...@gmail.com> wrote: >>> >>> Hi, >>> >>> If I hand-construct an IP datagram (bigger than mtu) using chained >>> vlib buffers and send this chain to ip4-lookup, would that be >>> fragmented and sent out as per the mtu requirements of the interface >>> from which the packet is determined to be sent out ? (assume that the >>> rx and tx sw_if_index is properly set) >>> >>> If not, which node do I send this datagram to, to achieve effectively >>> the above ? >> >> Yes, if IPv4 and DF==0. >> And you better remember that IP fragments are almost never a good idea. >> >> Cheers >> Ole >> >> >>> -=-=-=-=-=-=-=-=-=-=-=- >>> Links: You receive all messages sent to this group. >>> >>> View/Reply Online (#11172): https://lists.fd.io/g/vpp-dev/message/11172 >>> Mute This Topic: https://lists.fd.io/mt/28037801/675193 >>> Group Owner: vpp-dev+ow...@lists.fd.io >>> Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [otr...@employees.org] >>> -=-=-=-=-=-=-=-=-=-=-=-
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