OpenVPN is an absolute mess. The behaviour of configuration
parameters has been changed over the time; default values have been
changed over time; and it looks like nobody is actually testing
anything any more.
I have been spending hours today on figuring out why OpenVPN
is so damn slow. On a Lightning Wire Labs IPFire Mini Appliance
it achieves about 100 MBit/s in the default configuration when
"openssl speed -evp aes-256-gcm" achieves over 3.5 GBit/s.
Changing any of the cryptography parameters does not change
anything. Throughput remains around 100 MBit/s.
I finally set "cipher none" and "auth none" which disables
encryption and authentication altogether but does not increase
throughput. From here on it was absolutely clear that it was
not a crypto issue.
OpenVPN tries to be smart here and does its own fragmentation.
This is the worst idea I have heard of all day, because that job
is normally done best by the OS.
Various settings which allow the user to "tune" this are grossly
ineffective - let alone it isn't even clear what I am supposed
to configure anywhere. Setting "fragment 1500" weirdly still
does not convince openvpn to generate a packet that is longer
than 1400 bytes. Who'd a thunk?
There is a number of other parameters to set the MTU or which
are related to it (tun-mtu, link-mtu, fragment, mssfix).
On top of all of this we have two "bugs" in ovpnmain.cgi which
are being fixed in this patch:
1) mssfix can be configured by the user. However, we always
enable it in openvpn. The default is on, we only add "mssfix"
which simply turns it on.
It is now being disabled when the user has chosen so in the
web UI. I do not know if this is backwards-compatible.
2) We cap the MTU (tun-mtu) at 1500 bytes when fragment is being
used. So it becomes pointless that the user can this and the
user is not being made aware of this when they hit the save
button.
This was added when we added path MTU discovery. Since that
did not work and was removed, we can remove this now, too.
I archived a solid 500-600 MBit/s of goodput with these settings:
* Disable mssfix
* Set "fragment" to 0
* Set MTU to 9000
I am sure the MTU could be further increased to have bigger packets,
but I did not test how badly this will affect latency of the tunnel.
OpenVPN seems to only be able to handle a certain amount of packets
a second - no matter what. With larger packets, the throughput of
the tunnel increases, but latency might as well.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Cc: Erik Kapfer <erik.kapfer@ipfire.org>
Cc: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
In order to make deanonymisation harder, especially high-risk Tor users
might want to use certain Guard relays only (for example operated by
people they trust), enforce Tor to use Guard relays in certain countries
only (for example countries with very strict data protection laws or
poor diplomatic relations), or avoid Guard relays in certain countries
entirely.
Since Tor sticks to sampled Guards for a long time (usually within the
range of months), restricting those is believed to cause less harm to a
users' anonymity than restricting Exit relays, since their diversity of
a generic Tor user is significantly higher.
This patch extends the Tor CGI for restricting Guard nodes to certain
countries or relays matching certain fingerprints.
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
This extends the functionality of the Tor CGI in order to be able to
select multiple countries for possible Exit relays, which is - in terms
of anonymity - less worse than limiting all Tor circuits to a single
country.
For example, a user might want to avoid Exit relays in more than one
country, and permit Tor to use Exit relays elesewhere, and vice versa.
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Fixes: #12529
- If a client N2N configuration will be imported into IPFire systems,
a line will be added which calls the --up script to restart the
static route initscript. Since this is IPFire specific, i will only be
added via import on IPFire system.
- Deleted unneeded line in CLIENTCONF section.
- Added description to SERVERCONF section.
Signed-off-by: ummeegge <erik.kapfer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
When safe search is enabled, it is being enabled on YouTube, too.
This creates problems in some scenarios like schools where politics
is being tought as well as other subjects that might be censored by
YouTube (i.e. election TV spots).
Therefore it is now possible to exclude YouTube from Safe Search
but keep it enabled for the search engines.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Tor provides a function to resolve a relay's IP address into a country
code by taking advantage of a (heavily outdated) GeoIP database shipped
with it.
We should consequently use libloc for doing this, since it can be
confusing if those results differ from active connections in the
connection tracking CGI (where we _use_ libloc) and such tasks are why
we invented libloc in the first place. :-)
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
WPA3 mandates MFP, but many clients do not support it at all.
Therefore this can now be set to optional and clients will
fall back to WPA2.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
The action was performed after the table has already been
rendered which required reloading the page to show a new
share.
This has now been moved to the top so that new changes
will be shown immediately.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
This is very invalid HTML, very often inserted into spaces where
it should not be, and the page does not even need to be reloaded
after any action has been performed.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Samba will chose this automatically and the documentation advises
against changing the default.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
It is not a good default to withdraw samba from the race of becoming
the local master browser. There is no reason why it couldn't be.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
