From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10AECC433EF for ; Mon, 25 Jul 2022 18:07:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236331AbiGYSHr (ORCPT ); Mon, 25 Jul 2022 14:07:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59260 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232916AbiGYSHq (ORCPT ); Mon, 25 Jul 2022 14:07:46 -0400 Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D5B83DF1E for ; Mon, 25 Jul 2022 11:07:45 -0700 (PDT) Received: by mail-pj1-x102a.google.com with SMTP id t3-20020a17090a3b4300b001f21eb7e8b0so14499072pjf.1 for ; Mon, 25 Jul 2022 11:07:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20210112.gappssmtp.com; s=20210112; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=OcymhNupeAzOYHuZtiu44NzTYDWKe4lbSG6h8+i0C1Q=; b=SPnWWoJ5IjR1m9Q05vp0hIskWfpfqjpQKhfb7ObbtpgWl8BmhfuE5csIcNp340aPdl Dcb9RK7u4fd8tLxwV2vnVCR8NTiI8ZpfSeUgI+MLLYEEsEEzurrBaR2OALSOxWL4XwYk xtGf9YkwubGursp3psbOdXT/lBT3foEtsY3oQE8UEiKRxLm/MckR32cUUGjueps6/5r+ ZkNLwkmS4sPNdYfuvWivn0pkCS35y7fW415a0bJwQlGR1sbBU9/q1HMiPodkZ90YfdEl HI+W3GZM93ew4np/PKmiI7bhCSK5mmqinxs6t4L3exPdiW9/AwGysdkWdDesmlpLLlGy D8Gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=OcymhNupeAzOYHuZtiu44NzTYDWKe4lbSG6h8+i0C1Q=; b=sifYXkFeVZtXiSheUZH3hHTdS7253uqocoXwxIjKRmWor30mV10IBflwIcnDmjhnul 87mVU8Pt++iX2n3oafrsLtcJYCDp3UA3zYpvoo3p6uRIJwhzWYoOxc1tsXZW5SQHFsa7 /pPN+7iC/vYFOJj6aQmE+EkiQ2KqsTpgXYyzO7qYUhof8B82eZAteTBX9Z0v87cpK4du U5qNyXxuylsGuF5e3dzpxWvvzY+Bgr7czxlwYx94IYWt4gVRbLKsuzmBgJbR4Asww7z5 ZfC3IHgEibMO5SGFYoyuW8ZpCqy+YQQMC8VJrj523mcnmr6Aw8C0chWOXRr4NI813QQW Bwog== X-Gm-Message-State: AJIora838tlNcRvdGMR7Ursl3svb7/JVgWfZlK5SlHdPux+imGQCGCjD ll1bmp/k4kYQkQVOXZy083rnG90T601X8Q== X-Google-Smtp-Source: AGRyM1uspql8Zjz8M6cMXPsb+LgywNEyo7MpsmxEFk2kGP5xtRZUOO+aa4RIqg2H3Y6uTN1/xdcOOA== X-Received: by 2002:a17:903:2151:b0:16d:2dcf:fa2e with SMTP id s17-20020a170903215100b0016d2dcffa2emr13407729ple.124.1658772465334; Mon, 25 Jul 2022 11:07:45 -0700 (PDT) Received: from hermes.local (204-195-120-218.wavecable.com. [204.195.120.218]) by smtp.gmail.com with ESMTPSA id u5-20020a170902e5c500b0016d5a356b31sm5070589plf.116.2022.07.25.11.07.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Jul 2022 11:07:45 -0700 (PDT) Date: Mon, 25 Jul 2022 11:07:42 -0700 From: Stephen Hemminger To: "Kai Hendry" Cc: netdev@vger.kernel.org Subject: Re: Find IP address of active interface Message-ID: <20220725110742.34650b91@hermes.local> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Mon, 25 Jul 2022 08:48:15 +0800 "Kai Hendry" wrote: > Is there an easier way than: > > ip route get 8.8.8.8 2>/dev/null|grep -Eo 'src [0-9.]+'|grep -Eo '[0-9.]+' > > To figure out the active, Internet routing interface? > > Thank you, Alternate: $ ip -j route get 8.8.8.8 | \ python3 -c 'import json,sys;obj=json.load(sys.stdin);print(obj[0]["dev"]);' enp2s0 But both options won't do what you want if there is ECMP routes.