System Cant Satisfy the Requested Bandwith. Please Input Again

Duco Ergo Sum · Amateur Joined: 06 Dec 2005 Posts: 154 Location: Winsford

Hi at that place,

For the past week and a fleck I have been trying to connect to my function VPN, without success. The instructions for connecting presume the customer is a Windows 7 system.

The vpn is "IPSec (L2TP/IPSEC)" using a Pre-Shared Key.

For the purpose of this postal service I will employ simulated details and values:

gateway: vpn.office.com
PSK: vpn-office-com
username: your-login-username
password: your-login-countersign
domain (optional): part-name

What I accept tried so far, includes:

compiled every IPSEC kernel module -> No appreciable difference.

KVPN -> Gives an error racoon config error so a long list of other debug info which as information technology is security related I don't want post indiscriminately.

VPNC -> reports "No responce from target"
Cisco and regular UPD
I accept tried setting diverse ports to use, 47, l, 51, 443, 500, 1701, 1723, 10000

Strongswan -> the demon starts simply I cannot find evidence of a connection
ipsec.conf and ipsec.secret configured for the in a higher place details respectively.

I can only guess that this isn't a firewall upshot as a colleague who already connects to the vpn can only practice then using a virtual machine running Windows 7. My colleague says this is because of
firewall and routing issues from his Linux desktop. My assertion beingness that the virtual machines has to pass through the host and any other firewall in his network.

Please help...

salahx · Guru Joined: 12 Mar 2005 Posts: 499

I wrote a Gentoo wiki article covering setting upwards the server side of information technology: https://wiki.gentoo.org/wiki/IPsec_L2TP_VPN_server . Because all the protocols (ipsec, lt2p and pppd) are peer-to-peer, configuring information technology on the client side has a lot of similarities.

Duco Ergo Sum · Posted: Thu Aug 21, 2014 7:59 am Post subject:

Thank you.

I call back what I need is the "Ipsec ID" (group id/name) parameter. I take a working Windows organisation at present so I'll interrogate that.

Duco Ergo Sum · Posted: Monday Aug 25, 2014 ten:twenty pm Post bailiwick:

This is really frustrating.

I now take:

VPNC which times out without much indication of anything happening.
StrongSwan which starts merely I don't see whatever sign of a VPN nor have I institute a mode to test it.
OpenL2TP which I've had to install an overlay (booboo) to get. This doesn't seem to be able to initiate sessions, tunnel id not found, while tunnel testify - shows the tunnel I configured.
NetworkManager seems to permit a sub-set of functionality in its configuration of unlike sub-systems merely it protests that its unable to find an agent when I endeavour to first a session.

Additionally, I've experimented with Windows. The initial setup is catchy but the VPN works. No boosted data needed. With security in mind I'g sure, they've hidden the config details from prying eyes thus thwarting my programme to find the IP Sec ID there.

I am kickoff to question if it this is a propriety MS VPN implementation or could my system be just missing one picayune screw somewhere?

I have read the IPsec L2TP VPN server wiki folio and attempted to adjust its wisdom to my needs but unfortunately unsuccessfully.

Please tell me how I can exam a VPN connection, just to meet if it exists?

--
You know yous actually demand help when the voices tell you that yous're condign obsessed!

salahx · Guru Joined: 12 Mar 2005 Posts: 499

The offset, and near dificult layer, is the ipsec layer. Hither's a elementary config file you can adapt. Every bit the wiki page testify, uncomment the "include" line at the very lesser of /etc/ipsec.conf and create a /etc/ipsec.d/office.vpn.com.conf with content similar to the following:

Duco Ergo Sum · Posted: Thu Aug 28, 2014 12:48 am Post subject:

Hullo Salahx,

Thanks for again answering, I am very grateful.

The command 'ipsec upward vpnclient' has been most illustrative. StrongSwan doesn't go a response from the office network either.

salahx · Guru Joined: 12 Mar 2005 Posts: 499

Its seeing SOMETHING on the other side, its merely having trouble negotiating with information technology. It appears its trying to negoitate an IKEv2 connection, but we want IKEv1.

So lets tweak the config a fleck:

Duco Ergo Sum · Posted: Thu Aug 28, 2014 8:49 am Mail field of study:

Thanks.

We're making progress, new response message:

Duco Ergo Sum · Posted: Thu Aug 28, 2014 9:12 am Post field of study:

Looking in Windows

Command Panel - Administrative Tools - Windows Firewall with Advanced Security - Windows Firewall Properites (IPsec Settings) - Customize IPsec Defaults (Key substitution (Main Fashion) - Advanced [Customize]) - Customize Advanced Key Substitution Settings

salahx · Guru Joined: 12 Mar 2005 Posts: 499

Its "pfs=no" non "psf=no". It doesn't thing anyway because the command is ignored under strongSwan and "no" is the default. You shouldn't need the "esp=des-sha1-modp1024" every bit information technology should choose the right method during proffer procedure. In fact that will negotate PFS which is Non what y'all want - Microsoft's IKEv1 daemon doesn't support PFS.

Note that Windows has TWO implementations of ipsec: the IKEv1 1 used for l2tp tunnel, and and IKEv2 one which is controlled via the ipsec snap-in. The windows Firewall and other ipsec settings refer to the latter, simply nosotros want to apply the former.

Duco Ergo Sum · Posted: Friday Aug 29, 2014 12:04 am Post discipline:

Apologies, "psf" was a typo.

Yet, now mater how I try to configure the pfs option, I get the same result.

salahx · Guru Joined: 12 Mar 2005 Posts: 499

pfs selection is ignored in strongSwan anyway. Simply that "esp" line has to exist removed, because i know its wrong. If the server Notwithstanding won't accept whatever proposals offered by strongswan, even without the "esp" line there an "ike-scan" package in portage that should requite some information on what proposals the gateway will accept.

Duco Ergo Sum · Posted: Fri Aug 29, 2014 8:45 am Mail subject:

Hi,

I have used IKE-Scan which prompted me to change my Config as below and this has generated the follow information.

ike-browse output

salahx · Guru Joined: 12 Mar 2005 Posts: 499

OK now its accepting the proposal but its having trouble with the PSK. Information technology probably has to practice with how the VPN server is ideifying itself. Then lets change the secrets file to

Duco Ergo Sum · Posted: Fri Aug 29, 2014 9:51 pm Post subject:

Awesome! Cheers!

salahx · Guru Joined: 12 Mar 2005 Posts: 499

Were most there, simply were non at that place all the same. This goes dorsum with "how the server is identifty itself" problem with the PSK: Instead of identify itself via its name (vpn.case.com), it does so by its IP address (17.11.7.5).

Nosotros simply need to make one tweak:

Duco Ergo Sum · Posted: Sat Aug 30, 2014 5:21 pm Post bailiwick:

Perfect, next pace L2TP!

Duco Ergo Sum · Amateur Joined: 06 Dec 2005 Posts: 154 Location: Winsford

I thought this might happen.

/etc/xl2tp/xl2tpd.conf

salahx · Guru Joined: 12 Mar 2005 Posts: 499

Configuring an l2tp the customer is a dissimilar that the server - thakfully customer side is even easier:

The /etc/xl2tpd/xl2tpd.conf is even simpler and then the server i:

Duco Ergo Sum · Amateur Joined: 06 Dec 2005 Posts: 154 Location: Winsford

Hi,

I take at present tried a number of variations on a theme. Mostly where vpn.office.com could mean the url vpn.office.com or the ipsec connection name VPN.Function.COM, capitalise to emphasis the distinciton
of these two roles. Also with and without Function-Proper noun\\login-proper noun login-password and in combination with including excluding options.xl2tpd.client.

/etc/xl2tpd/xl2tpd.conf

salahx · Guru Joined: 12 Mar 2005 Posts: 499

xl2tpd and strongswan are unconnect, thus the "lns" value in the LAC department is just the server's domain name or IP address. In this case though, its not seeing the L2TP LNS (server) on the other side . This usually means the ipsec tunnel is down. Bank check and restart the tunnel if needed.

To see if information is going over the tunnel:

Duco Ergo Sum · Posted: Tue Sep 02, 2014 9:09 am Mail service field of study:

Hi,

I have tried multifariousness configurations of xl2tp. Just to add together to the confusion my mobo has two lan ports and wifi, I fear now this characteristic is coming dorsum to confuse me and my set-upwardly. 'eno1' is the lan port which is would be eth0 and is currently the only operational network connexion in this machine.

It appears that tcpdump is looking at 'bond0' so non finding annihilation. Could xl2tp be doing the aforementioned?

tcpdump -i eno1 produces the same output as below.

Make connexion

salahx · Guru Joined: 12 Mar 2005 Posts: 499

We're making progress. According to the log, it seeing the l2tp server on the other end. That means the ipsec is up and configurated properly, and traffic is flowing across it..At present the trouble is pppd. pppd is getting some extraneous options from somewhere. Namely, the nonexistent "/etc/ppp/options.l2tpd.lns" is causing pppd to exit. However it shouldn't even be looking for that.

Very picayune configuration should be needed on the l2tp side,, merely in that location may exist one tweak we need:

Duco Ergo Sum · Posted: Wed Sep 03, 2014 12:41 am Post subject:

I discovered a typo in the /etc/ppp/options.xl2tpd.client path namely the missing 'x'. Likewise I have added the user proper noun as you take advised and no joy.

salahx · Guru Joined: 12 Mar 2005 Posts: 499

The name used for the lac isn't important. Its not seeing the l2tp server once again. Be sure the strongSwan connection is upwardly, and try again. If it notwithstanding won'r work, stop strongswan and xl2tp, in another windows do a "ip xfrm monitor", starts strongswan and xl2tpd. Connect via strongSwan and the window "ip xfrm monitor" should display some stuff. Make a connection with xl2tpd-connect and more stuff will announced in the other window (alarm: this command outputs the secrets keys for the ipsec connection. The real keys have been replaced with 0'south)

Something like this:

System Cant Satisfy the Requested Bandwith. Please Input Again

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