PPP not available #4201

yisonPylkita · 2019-06-20T10:59:47Z

Windows version: Microsoft Windows [Version 10.0.18917.1000]

I was trying to connect to a VPN and my client (openfortivpn) requires ppp.
After running pppd I got this error

➜  pppd
Couldn't open the /dev/ppp device: No such device or address
modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.19.43-microsoft-standard/modules.dep.bin'
modprobe: FATAL: Module ppp_generic not found in directory /lib/modules/4.19.43-microsoft-standard                                                                                                                                                                                        pppd: Please load the ppp_generic kernel module.

The text was updated successfully, but these errors were encountered:

onomatopellan · 2019-06-21T00:25:59Z

Yes, another thing the WSL2 linux kernel lacks right now. If you feel adventurous, in #4203 you have an example of how to reconfigure, compile and replace the kernel yourself.

benhillis · 2019-06-21T01:59:05Z

Can you describe your scenario? Does connecting to the the VPN via Windows work?

therealkenc · 2019-06-21T07:00:37Z

Some wrongthinking VPNs use PPTP, sure, and there will always be Windows solutions for those. [There are Windows solutions for a lot of things...] But /dev/ppp and pppd has other use cases, like PPP over PTY. Problem with the long tail of the Linux kernel modules is there is a use case for all of them.

Not saying it should be enabled. Not saying it shouldn't. Saying it is a long long tail.

yisonPylkita · 2019-06-21T10:40:00Z

@benhillis I tried connect to a VPN in Windows a few time in them past, but every time I failed. (fortinet client doesn't seem to support stuff like realm). So I used a VM with a Linux and I could connect without problems.

Yet working on Windows and using Linux VM at the same time is rather troublesome so I tried to switch to Windows entirely and use WSL whenever I need a CLI. This support for PPP is the only thing that holds me back from doing so.

uishon · 2019-06-21T14:58:59Z

Same for me. Tried working with openfortivpn on wsl2 and got an error that pppd is not found. So, I went ahead, installed ppp (apt-get install ppp) and retried openfortivpn but got a read/write error. Ran it again in verbose mode to find the root cause and got this:

  ...
  DEBUG:  pppd_write thread
  ERROR:  read: Input/output error
  INFO:   Cancelling threads...
  DEBUG:  Waiting for pppd to exit...
  DEBUG:  waitpid: pppd exit status code 4
  ...

whereas exit code 4 means (from the manpage)

  4      The  kernel  does  not  support  PPP,  for  example, the PPP kernel driver is not included or cannot be
          loaded.

Any plans to include ppp in wsl2?

benhillis · 2019-06-22T19:55:55Z

Thanks for the information, I will get /dev/ppp added to the kernel config.

uishon · 2019-06-22T20:33:43Z

Great. Thanks! Please update when done so I can retry. Uri.

…

On Sat, Jun 22, 2019 at 10:56 PM Ben Hillis ***@***.***> wrote: Thanks for the information, I will get /dev/ppp added to the kernel config. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#4201?email_source=notifications&email_token=ACMZVKP6FW7ISPHVOBORDILP3Z7WHA5CNFSM4HZRZXR2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODYKQJOI#issuecomment-504693945>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACMZVKORVQVQ2KPRA7FCME3P3Z7WHANCNFSM4HZRZXRQ> .

dylman123 · 2019-08-07T01:56:34Z

Hi, any progress on this issue?

therealkenc · 2019-08-07T03:54:49Z

Yep, here. /dev/ppp is live on 18950, at least.

Although, that CONFIG_PPPOE is not set looks problematic, for some scenarios, anyway. FWIW this is how Ubuntu's native kernel ships.

$ grep PPP config-5.0.0-20-generic 
CONFIG_PPP=y
CONFIG_PPP_BSDCOMP=m
CONFIG_PPP_DEFLATE=m
CONFIG_PPP_FILTER=y
CONFIG_PPP_MPPE=m
CONFIG_PPP_MULTILINK=y
CONFIG_PPPOATM=m
CONFIG_PPPOE=m
CONFIG_PPPOL2TP=m
CONFIG_PPP_ASYNC=m
CONFIG_PPP_SYNC_TTY=m

uishon · 2019-08-11T20:52:36Z

Just tried it out again - build 18956.
Seems like ppp is now supported by the kernel (thanks!) but still - openfortivpn is not working. Here is the openfortivpn log with the errors I'm getting now:

INFO:   Connected to gateway.
INFO:   Authenticated.
INFO:   Remote gateway has allocated a VPN.
ERROR:  read: Input/output error
INFO:   Cancelling threads...
ERROR:  pppd: Has detached, or otherwise the connection was successfully established and terminated at the peer's request.
INFO:   Terminated pppd.
INFO:   Closed connection to gateway.
INFO:   Logged out.

When checking the pppd log, I see the following error:

Couldn't set tty to PPP discipline: Invalid argument

Any idea?

Biswa96 · 2019-08-11T20:56:48Z

I found that CONFIG_PPP_SYNC_TTY is not set in WSL/Linux kernel config.

uishon · 2019-08-11T21:06:43Z

Thanks. If it helps, here is the strace output - strace.log.

therealkenc · 2019-08-12T07:31:40Z

I found that CONFIG_PPP_SYNC_TTY is not set in WSL/Linux kernel config.

Correct, I linked that in my previous post. None of the suboptions are set, and needless to say, anything that depends on the suboption being available (here, arbitrarily, openfortivpn and CONFIG_PPP_SYNC_TTY) isn't going to work.

All of them are available, either as a module or =y in native Ubuntu.

# CONFIG_PPP is not set
CONFIG_PPP=y
# CONFIG_PPP_BSDCOMP is not set
# CONFIG_PPP_DEFLATE is not set
# CONFIG_PPP_FILTER is not set
# CONFIG_PPP_MPPE is not set
# CONFIG_PPP_MULTILINK is not set
# CONFIG_PPPOE is not set
# CONFIG_PPP_ASYNC is not set
# CONFIG_PPP_SYNC_TTY is not set

Biswa96 · 2019-08-18T15:55:18Z

FYI, those options are now enabled in WSL2-Linux-Kernel repository in linux-msft-wsl-4.19.y branch, see the commit on Aug 17, 2019.

uishon · 2019-10-07T14:18:46Z

Just checked it with insiders build 18995. openfortivpn works 👍. Thanks.

therealkenc · 2019-10-07T19:40:54Z

Great thanks for the confirm.

francovp · 2019-10-16T15:20:25Z

I'm on build 18999 and it doesn't work. I'm still receiving
pppd: The kernel does not support PPP

I need to use WSL2 to make it work?

uishon · 2019-10-18T10:40:16Z

Strange. It does work for me. The only difference I can think of is that it's an upgraded build, not a fresh install and I've apt-get installed ppp previously. Not sure why that would make a difference though.

…

On Wed, Oct 16, 2019 at 6:22 PM Franco Valerio ***@***.***> wrote: I'm in build 18999 and it doesn't work. I'm still receiving pppd: The kernel does not support PPP — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#4201?email_source=notifications&email_token=ACMZVKIEH6ZXUX2ET32EO3LQO4WUDA5CNFSM4HZRZXR2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEBM4LFY#issuecomment-542754199>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACMZVKLN26JJ2ALKNGSWLPLQO4WUDANCNFSM4HZRZXRQ> .

francovp · 2019-10-18T10:58:11Z

Its working now, I think it's because I was using WSL1. I switch to WSL2 and now is working fine :)

uishon · 2019-10-18T12:46:54Z

:-)

…

On Fri, 18 Oct 2019, 1:58 pm Franco Valerio, ***@***.***> wrote: Its working now, it was because I was using WSL1. I switch to WSL2 and now is working fine :) — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#4201?email_source=notifications&email_token=ACMZVKNYRV33VUH5HCRDQS3QPGJGRA5CNFSM4HZRZXR2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEBT4YAQ#issuecomment-543673346>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACMZVKLHZ6PRUOQSWWX2M43QPGJGRANCNFSM4HZRZXRQ> .

benhillis self-assigned this Jun 22, 2019

benhillis added fixinbound wsl2 Issue/feature applies to WSL 2 labels Jun 22, 2019

therealkenc mentioned this issue Jul 1, 2019

wsl2: vpn on host machine #4252

Closed

therealkenc added fixedininsiderbuilds and removed fixinbound labels Oct 7, 2019

therealkenc mentioned this issue Feb 25, 2020

WSL2: ifconfig not showing all network connections #4915

Closed

therealkenc added fixedinreleasebuild and removed fixedininsiderbuilds labels Jun 3, 2020

therealkenc closed this as completed Jun 3, 2020

bib-gourmand mentioned this issue Aug 26, 2021

Unable to use VPN routes from within WSL 2 #7315

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PPP not available #4201

PPP not available #4201

yisonPylkita commented Jun 20, 2019

onomatopellan commented Jun 21, 2019

benhillis commented Jun 21, 2019

therealkenc commented Jun 21, 2019

yisonPylkita commented Jun 21, 2019

uishon commented Jun 21, 2019

benhillis commented Jun 22, 2019

uishon commented Jun 22, 2019 via email

dylman123 commented Aug 7, 2019

therealkenc commented Aug 7, 2019

uishon commented Aug 11, 2019

Biswa96 commented Aug 11, 2019

uishon commented Aug 11, 2019 •

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therealkenc commented Aug 12, 2019

Biswa96 commented Aug 18, 2019

uishon commented Oct 7, 2019

therealkenc commented Oct 7, 2019

francovp commented Oct 16, 2019 •

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uishon commented Oct 18, 2019 via email

francovp commented Oct 18, 2019 •

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uishon commented Oct 18, 2019 via email

PPP not available #4201

PPP not available #4201

Comments

yisonPylkita commented Jun 20, 2019

onomatopellan commented Jun 21, 2019

benhillis commented Jun 21, 2019

therealkenc commented Jun 21, 2019

yisonPylkita commented Jun 21, 2019

uishon commented Jun 21, 2019

benhillis commented Jun 22, 2019

uishon commented Jun 22, 2019 via email

dylman123 commented Aug 7, 2019

therealkenc commented Aug 7, 2019

uishon commented Aug 11, 2019

Biswa96 commented Aug 11, 2019

uishon commented Aug 11, 2019 • edited Loading

therealkenc commented Aug 12, 2019

Biswa96 commented Aug 18, 2019

uishon commented Oct 7, 2019

therealkenc commented Oct 7, 2019

francovp commented Oct 16, 2019 • edited Loading

uishon commented Oct 18, 2019 via email

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uishon commented Aug 11, 2019 •

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