Re: [IPsec] New Version Notification for draft-xu-ipsecme-esp-in-udp-lb-00.txt

The draft has no text about mapping SA to source port. So if I’m understanding you correctly, the tunnel ingress calculates the port (is there actual calculation, or just picking?), so if it sends all packets for a particular SA with the same UDP source port, they will all traverse the same path and therefore will likely not get re-ordered, or at least will not get any more re-ordered than IPsec packets on the regular Internet.

Did I understand this correctly?

Yoav

> On 3 Nov 2016, at 8:27, Xuxiaohu <xuxiaohu@huawei.com> wrote:
> 
> Hi Yoav,
>  
> The load-balancing mechanism as described in this draft would ensure a given traffic flow to be forwarded over a certain path. In other words, there is no disordering issue. The destination port is assigned by IANA while the source port is dynamically calculated by the ingress of the IPsec/UDP tunnel. Furthermore, a given traffic flow would be forwarded over a certain path and therefore this is no disordering issue. As for why do we need a new port, I had attempted to reply in another email.
>  
> Best regards,
> XIaohu
>  
> 发件人: Yoav Nir [mailto:ynir.ietf@gmail.com] 
> 发送时间: 2016年11月1日 15:31
> 收件人: Xuxiaohu
> 抄送: ipsec@ietf.org
> 主题: Re: [IPsec] New Version Notification for draft-xu-ipsecme-esp-in-udp-lb-00.txt
>  
> Hi, Xiaohu
>  
> A few comments. Actually, they’re more like questions.
>  
> How are IPsec SAs mapped to UDP pseudo-connections?  Is it a 1:1 mapping between SPI and source port?
> If now, how do you deal with the packet reordering that the load balancer will do? IPsec requires ordered or nearly-ordered delivery.
> How is this negotiated?  In IKE? Prior agreement?
> Why do we need a new port?  What goes wrong if the packets go to port 4500?
>  
> Thanks
>  
> Yoav
> On 1 Nov 2016, at 3:45, Xuxiaohu <xuxiaohu@huawei.com <mailto:xuxiaohu@huawei.com>> wrote:
>  
> Hi all,
> 
> Any comments and suggestions are welcome.
> 
> Best regards,
> Xiaohu
> 
> 
> -----邮件原件-----
> 发件人: internet-drafts@ietf.org <mailto:internet-drafts@ietf.org> [mailto:internet-drafts@ietf.org <mailto:internet-drafts@ietf.org>]
> 发送时间: 2016年10月31日 19:15
> 收件人: Xuxiaohu; zhangdacheng; Xialiang (Frank)
> 主题: New Version Notification for draft-xu-ipsecme-esp-in-udp-lb-00.txt
> 
> 
> A new version of I-D, draft-xu-ipsecme-esp-in-udp-lb-00.txt
> has been successfully submitted by Liang Xia and posted to the IETF repository.
> 
> Name:      draft-xu-ipsecme-esp-in-udp-lb
> Revision:  00
> Title:     Encapsulating IPsec ESP in UDP for Load-balancing
> Document date:    2016-10-31
> Group:     Individual Submission
> Pages:     7
> URL:
> https://www.ietf.org/internet-drafts/draft-xu-ipsecme-esp-in-udp-lb-00.txt <https://www.ietf.org/internet-drafts/draft-xu-ipsecme-esp-in-udp-lb-00.txt>
> Status:
> https://datatracker.ietf.org/doc/draft-xu-ipsecme-esp-in-udp-lb/ <https://datatracker.ietf.org/doc/draft-xu-ipsecme-esp-in-udp-lb/>
> Htmlized:       https://tools.ietf.org/html/draft-xu-ipsecme-esp-in-udp-lb-00 <https://tools.ietf.org/html/draft-xu-ipsecme-esp-in-udp-lb-00>
> 
> 
> Abstract:
>  IPsec Virtual Private Network (VPN) is widely used by enterprises to
>  interconnect their geographical dispersed branch office locations
>  across IP Wide Area Network (WAN). To fully utilize the bandwidth
>  available in IP WAN, load balancing of traffic between different
>  IPsec VPN sites over Equal Cost Multi-Path (ECMP) and/or Link
>  Aggregation Group (LAG) within IP WAN is attractive to those
>  enterprises deploying IPsec VPN solutions. This document defines a
>  method to encapsulate IPsec Encapsulating Security Payload (ESP)
>  packets inside UDP packets for improving load-balancing of IPsec
>  tunneled traffic. In addition, this encapsulation is also applicable
>  to some special multi-tenant data center network environment where
>  the overlay tunnels need to be secured.
> 
> 
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> The IETF Secretariat
> 
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