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I need to reduce the MTU on a QNX Ethernet interface to
allow operation with an upstream router to a DSL line.
(MTU discovery isn’t working due to a router firmware problem.)
Is there some way to do this?

(I know about “sysctl -w net.inet.tcp.mss_ifmtu=1”, but that
doesn’t help; that’s for when QNX is running the PPPoE client itself.)

QNX 6.21, x86

John Nagle

(I still keep one QNX desktop machine around from the Overbot project,
to support the students at UC Santa Cruz who now have the Overbot.
and like the Overbot, it runs 6.21.)

On Mon, May 29, 2006 at 11:20:58PM +0000, John Nagle wrote:

I need to reduce the MTU on a QNX Ethernet interface to allow
operation with an upstream router to a DSL line. (MTU discovery
isn’t working due to a router firmware problem.) Is there some way to
do this?

(I know about “sysctl -w net.inet.tcp.mss_ifmtu=1”, but that doesn’t
help; that’s for when QNX is running the PPPoE client itself.)

Try

ifconfig en0 mtu n

Where n is the desired mtu.


Gilles Roy

It turns out that forcing a smaller MTU on a running system requires something
like this:

/sbin/sysctl -w net.inet.tcp.mss_ifmtu=1
/sbin/ifconfig en0 mtu 1492
/sbin/sysctl -w net.inet.tcp.mss_ifmtu=1
/sbin/route change -mtu 1492 default 192.168.1.1

This gets the word to everybody in the chain.

John Nagle

Gilles Roy wrote:

On Mon, May 29, 2006 at 11:20:58PM +0000, John Nagle wrote:

I need to reduce the MTU on a QNX Ethernet interface to allow
operation with an upstream router to a DSL line. (MTU discovery
isn’t working due to a router firmware problem.) Is there some way to
do this?

(I know about “sysctl -w net.inet.tcp.mss_ifmtu=1”, but that doesn’t
help; that’s for when QNX is running the PPPoE client itself.)


Try

ifconfig en0 mtu n

Where n is the desired mtu.


Gilles Roy

I think you only need the mss_ifmtu=1 if you have more than 1 interface.
The RFC says stack has to pick “biggest MTU in system” for MSS
caculation. So if one of your internal interface is 1500, and you reduce
your outgoing mtu to 1492, your MSS would still too big.

The mss_ifmtu switch the behavior to use “the interface’s MTU” to
caculate MSS.

-xtang

John Nagle <nagle@overbot.com> wrote:

It turns out that forcing a smaller MTU on a running system requires something
like this:

/sbin/sysctl -w net.inet.tcp.mss_ifmtu=1
/sbin/ifconfig en0 mtu 1492
/sbin/sysctl -w net.inet.tcp.mss_ifmtu=1
/sbin/route change -mtu 1492 default 192.168.1.1

This gets the word to everybody in the chain.

John Nagle

Gilles Roy wrote:
On Mon, May 29, 2006 at 11:20:58PM +0000, John Nagle wrote:

I need to reduce the MTU on a QNX Ethernet interface to allow
operation with an upstream router to a DSL line. (MTU discovery
isn’t working due to a router firmware problem.) Is there some way to
do this?

(I know about “sysctl -w net.inet.tcp.mss_ifmtu=1”, but that doesn’t
help; that’s for when QNX is running the PPPoE client itself.)


Try

ifconfig en0 mtu n

Where n is the desired mtu.


Gilles Roy

xtang@qnx.com wrote:

I think you only need the mss_ifmtu=1 if you have more than 1 interface.
The RFC says stack has to pick “biggest MTU in system” for MSS
caculation. So if one of your internal interface is 1500, and you reduce
your outgoing mtu to 1492, your MSS would still too big.

The mss_ifmtu switch the behavior to use “the interface’s MTU” to
caculate MSS.

The question is whether the loopback device’s MTU (which is huge)
goes into that calculation.

John Nagle

compile with error:Recursive variable ‘LIBS’ references itself
(eventually). Stop.
/usr/qnx630/target/qnx6/usr/inlcude/mk/qtargets.mk]