[SOLVED] SIOCADDRT error and two gateway for same destination when I use pptp?

ytyyutianyun · 02-18-2015, 10:59 PM

Before I use

Code:

pppd call

Code:

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    1024   0        0 wlp8s0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 wlp8s0

And then I call the code
server: 50.117.*.*

Code:

	sudo pppd call shayu13
	sudo route add -net 0.0.0.0 dev ppp0

I get the error:

Quote:

SIOCADDRT: Network is down

I must change the code by adding the sleep code.

Code:

	sudo pppd call shayu13
	sleep 15
	sudo route add -net 0.0.0.0 dev ppp0

Why? Thanks

And when I look the route tables:

Code:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0
0.0.0.0         192.168.1.1     0.0.0.0         UG    1024   0        0 wlp8s0
50.117.**.**  192.168.1.1     255.255.255.255 UGH   0      0        0 wlp8s0
172.16.**.**     0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 wlp8s0

It seems that 0.0.0.0 has two gateway. Is that OK? Thanks

jpollard · 02-19-2015, 03:38 PM

It takes some time for the network to be initialized, and until the network is initialized the route command can't work. Normally, the previous default route would be removed, but I think it works because the system will use the first one found in the route table.

What is going on is that the pppd service is authenticating connecting, and authenticating.

To avoid that, pppd has a "defaultroute" option that will set your default route after the connection is established, and avoid having to do it manually. I believe this should be in the configuration file for shayu13.

ytyyutianyun · 02-19-2015, 10:24 PM

Quote:

Originally Posted by jpollard

It takes some time for the network to be initialized, and until the network is initialized the route command can't work. Normally, the previous default route would be removed, but I think it works because the system will use the first one found in the route table.

What is going on is that the pppd service is authenticating connecting, and authenticating.

To avoid that, pppd has a "defaultroute" option that will set your default route after the connection is established, and avoid having to do it manually. I believe this should be in the configuration file for shayu13.

Can you give more suggestion about "defaultroute" . Actually, the configuration is I created by the pptpsetup. Thanks

jpollard · 02-20-2015, 07:05 AM

I got the info from the manpage on pppd:

Code:

       call name
              Read additional options from the file /etc/ppp/peers/name.  This
              file may contain privileged options, such  as  noauth,  even  if
              pppd  is  not  being run by root.  The name string may not begin
              with / or include .. as a pathname component.  The format of the
              options file is described below.
...
       defaultroute
              Add a default route to the system routing tables, using the peer
              as the gateway, when IPCP negotiation is successfully completed.
              This entry is removed when the PPP connection is  broken.   This
              option is privileged if the nodefaultroute option has been spec‐
              ified.

Thus I concluded that the defaultroute option needs to be in the /etc/ppp/peers/shayu13 configuration.

It is also quite possible that you have to add a script to /etc/ppp/ip-up.d/... to get it to work at the right time.

http://pptpclient.sourceforge.net/routing.phtml (the section on automatic routing), but the other sections might help as well.

ytyyutianyun · 02-20-2015, 09:53 PM

Quote:

Originally Posted by jpollard

I got the info from the ...but the other sections might help as well.

I know I could add the code
in

Code:

 /etc/ppp/ip-up.d/route-traffic

Code:

#!/bin/bash
NET="10.0.0.0/8" #< Modify
IFACE="ppp0"     #< Modify
#IFACE=$1
route add -net ${NET} dev ${IFACE}

But I could not found any directory which name is

Code:

ip-up.d/route-traffic

May be my OS is centos 7

jpollard · 02-20-2015, 10:22 PM

The directory is /etc/ppp/ip-up.d

The directory might not exist (not that many use CentOS with PPP - I've never needed it) and you would have to create it.

If you haven't tried it yet, I would suggest using the "defaultroute" in the options file in /etc/ppp/options file first. It is also possible it won't try the ip-up.d directory unless it is trying to set the network parameters... (and not having one should give an error message)

ytyyutianyun · 02-20-2015, 11:07 PM

Quote:

Originally Posted by jpollard

The directory is /etc/ppp/ip-up.d

The directory might not exist (not that many use CentOS with PPP - I've never needed it) and you would have to create it.

If you haven't tried it yet, I would suggest using the "defaultroute" in the options file in /etc/ppp/options file first. It is also possible it won't try the ip-up.d directory unless it is trying to set the network parameters... (and not having one should give an error message)

Thank you

I add the "defaultroute" in end line of the options file in /etc/ppp/options.pptp. And then in my shayu13 configuration. I add

Code:

file /etc/ppp/options.pptp

. But it doesn't work.

I browse the website and it shows my ip is

Code:

172.16.*.*

The fourth line of the

Quote:

Originally Posted by ytyyutianyun

172.16.*.*

jpollard · 02-21-2015, 04:34 AM

If you read the pppd manpage you will find that it reads the file "options".

Code:

OPTIONS FILES
       Options  can  be  taken  from  files as well as the command line.  Pppd
       reads  options  from   the   files   /etc/ppp/options,   ~/.ppprc   and
       /etc/ppp/options.ttyname  (in that order) before processing the options
       on the command line.  (In fact, the command-line options are scanned to
       find  the  terminal  name before the options.ttyname file is read.)  In
       forming the name of the options.ttyname  file,  the  initial  /dev/  is
       removed  from  the  terminal  name,  and any remaining / characters are
       replaced with dots.

       An options file is parsed into a series of words, delimited  by  white‐
       space.   Whitespace  can be included in a word by enclosing the word in
       double-quotes (").  A backslash (\) quotes the following character.   A
       hash  (#)  starts a comment, which continues until the end of the line.
       There is no restriction on using the file or  call  options  within  an
       options file.

So it shouldn't be using options.pptp

ytyyutianyun · 02-22-2015, 08:23 PM

Quote:

Originally Posted by jpollard

If you read the pppd manpage you will find that it reads the file "options".
....

So it shouldn't be using options.pptp

Thank you, when I put

Code:

defaultroute

in options
And just run

Code:

sudo pppd call shayu03

. It doesn't work until I run the code

Code:

	sudo route add -net 0.0.0.0 dev ppp0

jpollard · 02-22-2015, 09:40 PM

So now put the setup in the routing setup script as per the reference.

ytyyutianyun · 02-23-2015, 04:14 AM

Quote:

Originally Posted by jpollard

So now put the setup in the routing setup script as per the reference.

Sorry, but I can't understand what the "routing setup script" and "reference" refers to. Would you mind talking more details. I'll appreciate it. Thanks

jpollard · 02-23-2015, 05:36 AM

The reference I gave earlier:

http://pptpclient.sourceforge.net/routing.phtml

ytyyutianyun · 02-23-2015, 11:05 PM

Quote:

Originally Posted by jpollard

The reference I gave earlier:

http://pptpclient.sourceforge.net/routing.phtml

I know, Thank you. But the server seems fixed. And I need to change if one server is blocked.
I then tried to manually add it