Re: l2tp and openbsd 6.1

Hello Sterling,

Thanks for the response. I changed it to

ike passive esp transport \
proto udp from $public_ip to any port 1701 \
main auth "hmac-sha1" enc "aes-256" group modp1024\
quick auth "hmac-sha1" enc "aes-256" \
PSK "PSK-GOES-HERE"

and still no luck. I found out that Android 8 will connect (using aes). I am dumpping pflog0 and seeing no blocks. However, that doesn't mean it still isn't a potential pf problem I guess. However, if IOS and android 8 would connect, I would think that would rule a pf problem?

Is there a way to turn on additional debugging? I'm using isakmpd -K in rc.conf.local, so not using isakmpd.policy/.conf (from my understanding)
Everything in /var/log/messages is just from npppd. Unless I'm reading it wrong, there doesn't appear to be any errors.



-----Original Message-----
From: Sterling Archer [mailto:debeuk@gmail.com]
Sent: Monday, October 2, 2017 5:35 PM
To: Charles Amstutz <charlesa@infinitesys.com>
Cc: misc@openbsd.org
Subject: Re: l2tp and openbsd 6.1

On Mon, Oct 2, 2017 at 10:03 PM, Charles Amstutz <charlesa@infinitesys.com> wrote:
> Hello everyone,
>
> I'm new to this list and l2tp/openbsd (but do have working UNIX/Linux knowledge). After searching the previous forum posts (and the internet) I have found a lot of information on l2tp ipsec.conf connection strings. However, I can't get android to connect. I keep getting IKE negotiation failed errors.
>
> I've looked at sites such as:
>
> http://bluepilltech.blogspot.com/2017/02/openbsd-l2tp-over-ipsec-andro
> id-601-ios.html
> https://www.authbsd.com/blog/?p=20
> http://daemonforums.org/showthread.php?t=10326
> https://rzemieniecki.wordpress.com/2014/05/28/debugging-ipsec-on-openb
> sd-invalid_cookie/
> https://man.openbsd.org/npppd.conf.5
> https://blog.gordonturner.com/2016/12/10/openbsd-6-0-vpn-endpoint-for-
> ios-and-osx/
> https://marc.info/?l=openbsd-misc&m=145922338026396&w=2
> https://marc.info/?l=openbsd-misc&m=145614573528471&w=2
> https://www.mail-archive.com/misc@openbsd.org/msg145747.html
> ... etc
>
>
> I can get IOS to connect, but I can't get android 7 to connect. I've
> read that android has bugs with the vpn client in 6.x and 7.x (not
> sure if it is fixed in 8 or not). However, what is confusing is it
> connections just fine To my windows l2tp server. Bug tracker:
> https://issuetracker.google.com/issues/37074640#c35
>
>
> My goal: Setup openbsd to work with IOS/android/windows/whatever.
>
> My questions.
>
>
> 1) Can you have more than one ike line in ipsec.conf? from my presumption of looking at sites on the internet, you can, however, I am not sure.
>
> https://www.authbsd.com/blog/?p=20 makes it seem like you can, unless
> it is just two examples
>
>
> 2) Every time I read a site that says, "this configuration worked for me on android", it doesn't work for me. I presume it is my lack of understanding, though, I'm not ruling out the possible android bug.
>
>
> I appreciate any help.
>
>
>
> Here is my ipsec.conf (this allows IOS to connect)
>
> public_ip = "x.x.x.x"
>
>
>
> ike passive esp transport \
>
> proto udp from $public_ip to any port 1701 \
>
> main auth "hmac-sha1" enc "aes" group modp1024\
>
> quick auth "hmac-sha1" enc "aes" \
>
> psk "PSK-GOES-HERE"
>
> Here is my npppd.conf
>
>
>
> authentication LOCAL type local {
>
> users-file "/etc/npppd/npppd-users"
>
> }
>
>
>
> tunnel L2TP protocol l2tp {
>
> listen on 0.0.0.0
>
> listen on ::
>
> }
>
>
>
> ipcp IPCP {
>
> pool-address 10.0.0.101-10.0.0.254
>
> dns-servers x.x.x.x
>
> }
>
>
>
> # use pppx(4) interface. use an interface per a ppp session.
>
> interface pppx0 address 10.0.0.1 ipcp IPCP
>
> bind tunnel from L2TP authenticated by LOCAL to pppx0

I'm able to connect using a similar setup, but using aes-256 instead of aes as encoding in ipsec.conf.

--
:wq!