- # something keeps answering all tftp requests with auth requests (SYN
- # packets to the client tcp/113). Since the PXE client doesn't answer with
- # RST, the auth query has to wait until it times out. Forbidding the
- # terminalserver to send out packets to tcp/113 via iptables _greatly_
- # speeds up the process. But of course the real fix would be to have grml
- # stop sending out auth queries to tftp clients. according to netstat, it
- # is in.tftpd itself sending out the auth queries.
- # Thanks to Marc Haber and Wolfgang Karall for noticing and current fix.
- if [ -x /sbin/iptables ] ; then
- if iptables -L | grep -q '^REJECT.*tcp-reset' ; then
- echo "Rule for tcp/113 already present, nothing to be done."
- else
- echo -n "Rejecting tcp/113 via iptables to speed up speed up booting via PXE:"
- iptables -A OUTPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset && echo done || echo failed
+ if [[ $IPTABLES_SNAT_ != "true" ]]; then
+ return
+ fi
+ startIptables
+}
+
+function startIptables
+{
+ if [ -x /sbin/iptables ] ; then
+ if [[ $NAT_INTERFACE_ != "" ]]; then
+ local nat_source_ip_=`netGetIp "$NAT_INTERFACE_" warn`
+
+ if iptables -t nat -vnL POSTROUTING | grep -q "SNAT.*${NAT_INTERFACE_}.*to:${nat_source_ip_}" ; then
+ echo "Rule for SNAT already present, nothing to be done."
+ else
+ echo "Setting up SNAT for terminalserver clients on ${NAT_INTERFACE_}:"
+ echo "* iptables -t nat -F POSTROUTING"
+ echo -n "* iptables -t nat -A POSTROUTING -o $NAT_INTERFACE_ -j SNAT --to-source $nat_source_ip_ ... "
+ { iptables -t nat -F POSTROUTING && \
+ iptables -t nat -A POSTROUTING -o "$NAT_INTERFACE_" -j SNAT --to-source "$nat_source_ip_" ; } && \
+ echo done || echo failed
+ fi
+ if [ `cat /proc/sys/net/ipv4/ip_forward` -eq 1 ]; then
+ echo "IP-Forwarding already enabled, nothing to be done."
+ else
+ echo -n "Enabling IP-Forwarding: "
+ echo 1 > /proc/sys/net/ipv4/ip_forward && echo done || echo failed
+ fi