I agree with Ole. See https://www2.eecs.berkeley.edu/Pubs/TechRpts/2005/EECS-2005-24.pdf
From: vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] On Behalf Of Burt Silverman Sent: Thursday, June 29, 2017 12:49 PM To: Ole Troan <otr...@employees.org> Cc: Soheil Abbasloo <ab.soh...@gmail.com>; vpp-dev <vpp-dev@lists.fd.io> Subject: Re: [vpp-dev] IPv4 Option field I believe the standards should be adhered to. RFC791 has not been obsoleted. One man's opinion (sentence 1). Burt On Thu, Jun 29, 2017 at 11:11 AM, Ole Troan <otr...@employees.org<mailto:otr...@employees.org>> wrote: Soheil, Others my correct me, but as far as I know IPv4 options are for all practical purposes deprecated. Lots of forwarding planes do a validation check of 0x45 on the first octet. Likewise for middleboxes (e.g. NAT). Have you tried if you can get these packets passed any routers / across the Internet? Not impossible to change the IP4 VPP path, although it would require fixing all code that finds the L4 header. But I think you would end up in horrific deployment issues... Cheers, Ole > On 29 Jun 2017, at 02:21, Soheil Abbasloo > <ab.soh...@gmail.com<mailto:ab.soh...@gmail.com>> wrote: > > Hi all, > > This is Soheil. We are working on a project involving the IPv4 In-Band OAM. > > I have tried to use VPP in a simple scenario (like the simple > switching/routing tutorial in fd.io<http://fd.io>) to pass IPv4-Options (in > out case TIMESTAMP option) between two containers. However, packets having > IP-Option field will be dropped by VPP due to the checksum error. > > I have checked the source code (17.04) and found that VPP only handles fixed > 20 Bytes IP headers (there is a header size check in ipv4-input node > {<>!=0x45}). Which might indicate that VPP doesn't handle IP-options; hence > the source of wrong checksum calculations in VPP. > > So is there any plan for support IPv4-Option fields in VPP? Is there any > reason for not supporting it?! Or maybe I'm doing something wrong, can you > please tell me what I have missed here? > > ( > Just a few things: > 1- I have checked checksum calculations in my server where I insert > IP-options and they are fine! > 2- When I don't insert options, everything is fine and packets can be > received at client > ) > > Thanks, > Soheil > _______________________________________________ > vpp-dev mailing list > vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> > https://lists.fd.io/mailman/listinfo/vpp-dev _______________________________________________ vpp-dev mailing list vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> https://lists.fd.io/mailman/listinfo/vpp-dev
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