[Swan] Problem with setting up ipsec

[Paul Wouters]

On Mon, 17 Oct 2016, Maciej Piechotka wrote:

> Possibly interesting data point - I was able to set up ipsec tunnel with pure Fedora (userspace + kernel) but not Fedora strongswan tools or Centos libreswan tools
> on CoreOS kernel.

I don't know what "pure fedora (userspace + kernel)" means?

Perhaps you are trying to say the userlands that work on fedora/centos
do not work on coreos kernels?

Its surely possible the CoreOS kernel is missing some kind of required
feature for IPsec to work...

Paul
> On Sun, Oct 16, 2016 at 8:56 PM Maciej Piechotka <uzytkownik2 at gmail.com> wrote:
>       Hi Paul,
>
>       Sorry - I've tried it before but I forgot to reenable it after
>       recreation of VM. However it doesn't help.
>
>       Matt
>
>       On Sun, Oct 16, 2016 at 6:47 PM, Paul Wouters <paul at nohats.ca> wrote:
>       > On Sun, 16 Oct 2016, Maciej Piechotka wrote:
>       >
>       >> I have problem with setting up ipsec. I see ESP packets coming through
>       >> but they are dropped during policy check (i.e. XfrmInTmplMismatch is
>       >> increased) so in tcpdump only the ESP packets are shown. I could not
>       >> find any information how to proceed from here.
>       >>
>       >> Matt
>       >> PS. I disabled receiving messages from this group so please include me
>       >> in To: or Cc: list.
>       >
>       >
>       > Note that your barf's did not include log files. But regardless, it
>       > shows the kernel ip xfrm state/policy showing the tunnels are up fine.
>       >
>       > The only thing I can see wrong is:
>       >
>       > Checking for IPsec support in kernel                    [OK]
>       >  NETKEY: Testing XFRM related proc values
>       >          ICMP default/send_redirects                    [NOT DISABLED]
>       >
>       >   Disable /proc/sys/net/ipv4/conf/*/send_redirects or NETKEY will act on
>       > or cause sending of bogus ICMP redirects!
>       >
>       >          ICMP default/accept_redirects                  [NOT DISABLED]
>       >
>       >   Disable /proc/sys/net/ipv4/conf/*/accept_redirects or NETKEY will act
>       > on or cause sending of bogus ICMP redirects!
>       >
>       >          XFRM larval drop                               [OK]
>       > Pluto ipsec.conf syntax                                 [OK]
>       > Hardware random device                                  [N/A]
>       > Two or more interfaces found, checking IP forwarding    [OK]
>       > Checking rp_filter                                      [ENABLED]
>       >  /proc/sys/net/ipv4/conf/all/rp_filter                  [ENABLED]
>       >  /proc/sys/net/ipv4/conf/default/rp_filter              [ENABLED]
>       >  /proc/sys/net/ipv4/conf/eth0/rp_filter                 [ENABLED]
>       >  /proc/sys/net/ipv4/conf/eth1/rp_filter                 [ENABLED]
>       >  /proc/sys/net/ipv4/conf/flannel0/rp_filter             [ENABLED]
>       >  /proc/sys/net/ipv4/conf/ip_vti0/rp_filter              [ENABLED]
>       >
>       >
>       > Please completely disable redirects and rp_filter
>       >
>       > https://libreswan.org/wiki/FAQ#Why_is_it_recommended_to_disable_rp_filter_in_.2Fproc.2Fsys.2Fnet_.3F
>       >
>       > https://libreswan.org/wiki/FAQ#Why_is_it_recommended_to_disable_send_redirects_in_.2Fproc.2Fsys.2Fnet_.3F
>       >
>       > Paul
> 
> 
>