NetworkManager: no internet connection when using dhclient

By default, I get connected to my wireless network, but I don't have access to the internet. I can solve this in 2 ways :
1- I can add the line dhcp=internal in NetworkManager.conf.
2- I can type the command sudo dhclient wlan0. (I did add a kernel setting to have wlan0 as my wireless interface name.).
I am wondering why the default invocation of dhclient by NetworkManager is not working. Why do I have to call it again to make it work?
(Also, having dhcp=dhcpcd instead does not even connect to the network.)

I have both dhclient and dhcpcd installed but my dhcpcd.service is disabled and it works for me. I don't know why the service is disabled nor I remember if I did it manually. Also try to disable the kernel line naming your wireless interface, it might be related (trial and error should reveal that). Perhaps check NM configuration if you have dhcp enabled and IP stack properly configured for the correct interface.

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[SOLVED] NetworkManager ignores MTU size when using PPTP

I'm using PPTP to connect to my working network.
I've configured connection to use with pon/poff and it works well, but I want to use NetworkManager to manage all connections.
I created VPN PPTP connection. But after successful authentification NM drops connection with next message:
pptp[18526]: nm-pptp-service-18522 warn[decaps_gre:pptp_gre.c:331]: short read (-1): Message too long
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I've changed next options in /etc/ppp/options
mtu 1000
mru 1000
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Then I run
watch ip link show
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Last edited by Shtsh (2012-06-27 11:50:17)

Resolved using http://archlinux.org.ru/forum/viewtopic.php?f=16&t=8721
# cat /etc/NetworkManager/dispatcher.d/20-mtu_change
#!/bin/bash
INTERFACE=$1
STATUS=$2
VPN_ID="5d4ee387-3171-4006-bda1-231b249690b9"
if [ "$STATUS" = "vpn-up" -a "$CONNECTION_UUID" = "$VPN_ID" ]; then
ip link set "$INTERFACE" mtu 1000
fi

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NetworkManager: no internet connection when using dhclient

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