Hi.
I wanted to write this for a while already, so here it goes:
Like thomas, we had to adjust the MTU for our interfaces;
we do it per default like this in the ipv4 service script:
===================== patch start ================================
--- lfs/sysconfig/network-devices/services/ipv4-static 2007-10-23
11:15:59.000000000 +0200
+++ lfs/sysconfig/network-devices/services/ipv4-static 2007-10-23
11:17:13.000000000 +0200
@@ -13,6 +13,9 @@
#
########################################################################
+
+MTU=1492
+
. /etc/sysconfig/rc
. ${rc_functions}
. ${IFCONFIG}
@@ -23,6 +26,7 @@
exit 1
fi
+
if [ -z "${PREFIX}" -a -z "${PEER}" ]; then
boot_mesg -n "PREFIX variable missing from ${IFCONFIG}," ${WARNING}
boot_mesg " assuming 24."
@@ -48,6 +52,10 @@
boot_mesg "Adding IPv4 address ${IP} to the ${1}
interface..."
ip addr add ${args} dev ${1}
evaluate_retval
+
+ echo "Setting the MTU for $1 to $MTU"
+ echo "$MTU" > "/sys/class/net/$1/mtu"
+ evaluate_retval
if [ -n "${GATEWAY}" ]; then
if ip route | grep -q default; then
===================== patch end ================================
As the $IFCONFIG file is read after the fixed "MTU=1492, it can be
overridden inside of it.
But something like the attached patch "ipv4-static.diff" would probably
more desirable for the book, as it just modifies the current behavior in
case an MTU setting is present in the $IFCONFIG file.
There has been a script in the
bootscripts/contrib/sysconfig/network-devices/services/mtu file of the
LFS-Book repo, but I find it slightly more aesthetic to just include it
in the ipv4-static script, avoiding for example the "..cannot continue"
message which the seperate script would produce for $IFCONFIGs without
an MTU entry.
I've attached a patch to the (LFS-)book's sources to that effect.
While the the ticket resides in the trac for BLFS, the change would have
to take place in LFS, wouldn't it, so I cc'd the LFS development list.
greets,
jens
--- lfs/sysconfig/network-devices/services/ipv4-static.orig 2009-04-23
17:10:26.000000000 +0200
+++ lfs/sysconfig/network-devices/services/ipv4-static 2009-04-23
17:13:20.000000000 +0200
@@ -49,6 +49,12 @@
ip addr add ${args} dev ${1}
evaluate_retval
+ if [ -n "${MTU}" ]; then
+ boot_mesg "Setting the MTU for $1 to $MTU"
+ echo "$MTU" > "/sys/class/net/$1/mtu"
+ evaluate_retval
+ fi
+
if [ -n "${GATEWAY}" ]; then
if ip route | grep -q default; then
boot_mesg "Gateway already setup; skipping."
${WARNING}
Index: bootscripts/contrib/lsb-v3/sysconfig/network-devices/services/ipv4-static
===================================================================
--- bootscripts/contrib/lsb-v3/sysconfig/network-devices/services/ipv4-static
(revision 8852)
+++ bootscripts/contrib/lsb-v3/sysconfig/network-devices/services/ipv4-static
(working copy)
@@ -48,6 +48,12 @@
ip addr add ${args} dev ${1}
evaluate_retval
+ if [ -n "${MTU}" ]; then
+ boot_mesg "Setting the MTU for $1 to $MTU"
+ echo "$MTU" > "/sys/class/net/$1/mtu"
+ evaluate_retval
+ fi
+
if [ -n "${GATEWAY}" ]; then
if ip route | grep -q default; then
log_warning_msg "Gateway already setup;
skipping." ${WARNING}
Index: bootscripts/lfs/sysconfig/network-devices/services/ipv4-static
===================================================================
--- bootscripts/lfs/sysconfig/network-devices/services/ipv4-static
(revision 8852)
+++ bootscripts/lfs/sysconfig/network-devices/services/ipv4-static
(working copy)
@@ -49,6 +49,12 @@
ip addr add ${args} dev ${1}
evaluate_retval
+ if [ -n "${MTU}" ]; then
+ boot_mesg "Setting the MTU for $1 to $MTU"
+ echo "$MTU" > "/sys/class/net/$1/mtu"
+ evaluate_retval
+ fi
+
if [ -n "${GATEWAY}" ]; then
if ip route | grep -q default; then
boot_mesg "Gateway already setup; skipping."
${WARNING}
--
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