Hi, I've been using netfilter successfully -- thanks for writing it. I was wondering if I could improve my VOIP calls using netfilter. The main problem is excessive jitter delay to the receiver when P2P or WEB uploads /browsing is/are occurring. I have 512/128 ADSL and I am using tc-htb and using a reduced MTU (576 bytes). The RTP data is getting through its just that the jitter delay is very long (seconds). The jitter delay returns to unnoticeable when the uploads are stopped. Some basic testing indicates that jitter delay is mostly unnoticeable if all other traffic is limited to 24kbit(!) upload. I was wondering if netfilter could detect the outgoing/incoming RTP traffic and then set a flag. After RTP traffic has finished the flag would be removed (using a timeout). The flag could then be used to CLASSIFY other packets into say a 24kbit upload pool. Looking at the iptables docs there is no specific module that could do this although you could hack the 'condition' module to enable setting of flags and add timeouts by reusing some of the 'recent' module code. I am thinking about doing this, but I'd thought I'd ask first to see if anyone has any thoughts about whether its been done already or whether it would work or whether its too hard. Thx, Matt.
