Re: [PATCH] systemd-networkd: cherry picking route handling patch

[Maciej Borzecki <maciej.borzecki@open-rnd.pl>]

On 01/08 12:13, Otavio Salvador wrote:
> On Thu, Jan 8, 2015 at 6:43 AM, Maciej Borzecki
> <maciej.borzecki@open-rnd.pl> wrote:
> > There is a problem in systemd-networkd version used in OE-core (216 as
> > of now) that prevents a successful communication in a configuration
> > that uses a static or IPv4 LL address alongside a dynamically obtained
> > one. The setup is rather not uncommon as is makes sense to always have
> > a static well known address that a technician or a support engineer
> > can access while in the field.
> >
> > The current code in systed-networkd uses a clever trick to add a
>
> typo: systemd-networkd
>
> > static route to the gateway, to workaround a misconfigured DHCP server
> > that would assign an address from network pool that the gateway is not
> > a part of. The trick was missing a source IP address specification in
> > the static route, thus normally the first assigned IP address would be
> > used for outgoing IP packets. In this particular case the address
> > would the static one, hence the packet would most probably be dropped
> > by the router. Also, it is quite common in smaller networks that the
> > DHCP server, gateway router and even a DNS server are colocated. In
>
> collocated?

Yes, obviously collocated. I'm not sure why, but somehow I missed
[PATCH 0/1] for this cover letter when sending a 1-patch series. If
that's ok, I won't resend the cover letter with typos fixed. It was to
give some background as the backported patch, as it's not that intuitive.

>
> > these setups the current code will effectively render any
> > communication to or past the router impossible.
>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
> Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750

--
Maciej Borzęcki
Senior Software Developer at Open-RnD Sp. z o.o., Poland
www.open-rnd.pl
mobile: +48 889 117 365, fax: +48 42 657 9079


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