How to force an application to use only ipv4?

abdelkader belahcene

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May 18, 2013, 5:20:01 AM5/18/13

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Hi,

I have a problem connection from thin clients (old machines) to server using xdmcp ( connection thru X using port 6000 and 6001),

with previous debian 6.0.7, mint 13, I had problem,

with recent distro mint 14 or 15 , debian 7, I have connection pb
I suspect a conflit ??? between ipv6 and ipv6 ? may be my old machines don't understand this protocol ?

I want to test mint15 with just ipv4, I want to force ipv4 on the mdm manager ( gnome-like) where to do it ??

here is the output for open port

netstat -nau |grep 177
udp6       0      0 :::177                  :::*
netstat -nat |grep 6000
tcp        0      0 0.0.0.0:6000            0.0.0.0:*               LISTEN
tcp6       0      0 :::6000                 :::*                    LISTEN

no port open on ipv4 udp ??

thanks for help

Roger Leigh

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May 18, 2013, 7:50:03 AM5/18/13

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On Sat, May 18, 2013 at 10:18:33AM +0100, abdelkader belahcene wrote:
> with recent distro mint 14 or 15 , debian 7, I have connection pb
> I suspect a conflit ??? between ipv6 and ipv6 ? may be my old machines
> don't understand this protocol ?

Does your old machine have an IPv6 address? Does your new machine
have an IPv6 address? Can you ping6 one machine from the other?

% ip -6 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:770:1d5:ffff:ffff:ffff:ffff:ffff/64 scope global dynamic
valid_lft 86396sec preferred_lft 14396sec
inet6 fe80::62a4:4cff:fe5f:1257/64 scope link
valid_lft forever preferred_lft forever

Note the global address for eth0. If you can't ping6 the other
machine, then there's probably no IPv6 connectivity. All services
should default to IPv6 and fall back to IPv4 if unavailable.

Regards,
Roger

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Thilo Six

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May 18, 2013, 11:40:02 AM5/18/13

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Hello abdelkader

Excerpt from abdelkader belahcene:

-- <snip> --

> I want to test mint15 with just ipv4, I want to force ipv4 on the mdm
> manager ( gnome-like) where to do it ??

-- <snip> --

I do not know mint but with debian wheezy it is easy to turn off/on IPv6 on the fly:

/etc/sysctl.d/ipv6.conf --------------------------------------------------------

# Disable IPv6
net.ipv6.conf.all.disable_ipv6=1
-------------------------------------------------------------------------------/

then you need to activate those settings with:
# sysctl -p /etc/sysctl.d/*.conf

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Regards,
Thilo

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