From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phil Sutter Subject: Re: [iproute PATCH] man: ip-route.8: Document nexthop limit Date: Tue, 13 Nov 2018 13:37:03 +0100 Message-ID: <20181113123702.GO6440@orbyte.nwl.cc> References: <20181112222101.9674-1-phil@nwl.cc> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Stephen Hemminger , netdev@vger.kernel.org To: David Ahern Return-path: Received: from orbyte.nwl.cc ([151.80.46.58]:42588 "EHLO orbyte.nwl.cc" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732895AbeKMWfC (ORCPT ); Tue, 13 Nov 2018 17:35:02 -0500 Content-Disposition: inline In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: Hi David, On Mon, Nov 12, 2018 at 04:37:48PM -0800, David Ahern wrote: > On 11/12/18 2:21 PM, Phil Sutter wrote: > > diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in > > index a33ce1f0f4006..383178c11331e 100644 > > --- a/man/man8/ip-route.8.in > > +++ b/man/man8/ip-route.8.in > > @@ -589,6 +589,13 @@ argument lists: > > route reflecting its relative bandwidth or quality. > > .in -8 > > > > +The internal buffer used in iproute2 limits the maximum number of nexthops to > > +be specified in one go. If only a gateway address is given, the current buffer > > +size allows for 144 IPv6 nexthops and 253 IPv4 ones. If more are required, they > > +may be added to the existing route using > > +.B "ip route append" > > +command. > > + > > That is not true for IPv4. 'ip ro append' adds a new route after the > existing route - an entry that can not be hit unless all of the nexthops > in the first route are down. 'ip ro prepend' adds a new entry before the > existing one meaning it takes precedence over the existing entries. Oh, thanks for clarifying. I'll follow-up with a fixed version. > For IPv6, 'append' and 'prepend' both add new nexthops to the existing > entry. 'ip route prepend' is not even documented. :( Thanks, Phil