Return-Path: X-Original-To: quic-issues@ietfa.amsl.com Delivered-To: quic-issues@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E4BB3A08C7 for ; Sat, 25 Jul 2020 19:19:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.697 X-Spam-Level: X-Spam-Status: No, score=-1.697 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_IMAGE_ONLY_28=1.404, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id d6ThLd0AOL40 for ; Sat, 25 Jul 2020 19:19:08 -0700 (PDT) Received: from out-17.smtp.github.com (out-17.smtp.github.com [192.30.252.200]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1BD0C3A08BE for ; Sat, 25 Jul 2020 19:19:07 -0700 (PDT) Received: from github-lowworker-6349a71.ac4-iad.github.net (github-lowworker-6349a71.ac4-iad.github.net [10.52.18.20]) by smtp.github.com (Postfix) with ESMTP id 28F335C0E0E for ; Sat, 25 Jul 2020 19:19:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1595729946; bh=XjjJqZJnpSPzjG7y+HBmCN/c58p4ayRyqxh0YEjEpTk=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=VdMQYRlKIXJ96sUi617qfrVMRWxBE4EPi3x73VxeU+vu5GC1YqsBkwV0X2rjnowuu YtLaLQirdk6VpDUumAY5UD3mxy6KXOp9xsHHJD6UoFmBsI9Z+HI+ngAiyQCx2wrWF9 z3bNZlwknDMArEqSBRSreDm91/8L/cdXe83ggYJk= Date: Sat, 25 Jul 2020 19:19:06 -0700 From: Kazuho Oku Reply-To: quicwg/base-drafts To: quicwg/base-drafts Cc: Subscribed Message-ID: In-Reply-To: References: Subject: Re: [quicwg/base-drafts] Servers are not expected to validate multiple paths simultaneously (#3932) Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="--==_mimepart_5f1ce81a181fb_7043fa9c7ccd96c5879ef"; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: list X-GitHub-Sender: kazuho X-GitHub-Recipient: quic-issues X-GitHub-Reason: subscribed X-Auto-Response-Suppress: All X-GitHub-Recipient-Address: quic-issues@ietf.org Archived-At: X-BeenThere: quic-issues@ietf.org X-Mailman-Version: 2.1.29 List-Id: Notification list for GitHub issues related to the QUIC WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 26 Jul 2020 02:19:11 -0000 ----==_mimepart_5f1ce81a181fb_7043fa9c7ccd96c5879ef Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit +1 to what @ekinnear says. The resolution of #3489 (which ended up as PR #3557) was that a server has to remember state of N paths where N is the number of CIDs active at one time. As @ekinnear says, a client cannot tell when a server *thinks* that it received two probes concurrently. Therefore, it is very tricky to have this kind of restriction within a specification that allows clients to retain multiple backup paths. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/quicwg/base-drafts/issues/3932#issuecomment-663926936 ----==_mimepart_5f1ce81a181fb_7043fa9c7ccd96c5879ef Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit

+1 to what @ekinnear says.

The resolution of #3489 (which ended up as PR #3557) was that a server has to remember state of N paths where N is the number of CIDs active at one time.

As @ekinnear says, a client cannot tell when a server thinks that it received two probes concurrently. Therefore, it is very tricky to have this kind of restriction within a specification that allows clients to retain multiple backup paths.

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