Red Hat Bugzilla – Bug 465893
NetworkManager-pptp set incorrect MTU when connecting a pptp server over a wlan interface which has MTU lower than 1500
Last modified: 2009-07-14 10:27:20 EDT
Description of problem:
I have a wlan0 interface like this:
$ /sbin/ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:1D:E0:58:BA:E7
inet addr:192.168.1.101 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::21d:e0ff:fe58:bae7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:37916 errors:0 dropped:0 overruns:0 frame:0
TX packets:35731 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:29619551 (28.2 MiB) TX bytes:5179262 (4.9 MiB)
Its MTU is 1492,
And I created a pptp vpn by using network manager, I got an interface like this:
$ /sbin/ifconfig ppp0
ppp0 Link encap:Point-to-Point Protocol
inet addr:192.168.3.8 P-t-P:192.168.3.8 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1496 Metric:1
RX packets:7 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:100 (100.0 b) TX bytes:94 (94.0 b)
Its MTU is 1496, more than the mtu of wlan0, it will cause the ppp0 lost connection after some activities over the pptp network.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Prepare a network interface which has MTU lower than 1500, connecting a pptp server over that network. You'll get a pppX interface which has a MTU of 1496, then after you access big chunk data over the pppX, the pptp connection lost.
NetworkManager-pptp shall set MTU according to the mtu of the interface who loads it. And another improving feature recommendation is to provide a way to set MTU manually in NM-pptp configuration dialog.
NM-pptp set the MTU correctly.
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