Re: ping problems
If you ping another destination during the hang - does it work? If you ifdown and ifup the interfaces (wan + lan) on the router after a hang - is it released? an icmp packet is short so i don't think this is the case but: what is the MTU on the lan/wan? Also, use a tool like mtr http://en.wikipedia.org/wiki/Mtr_(My_traceroute) to detect any packet loss along the route. 2009/5/27 Erez D erez0...@gmail.com: hi i have an openwrt (linux) router, with regular firewall rules (nat, related+established,clamp-mss-to-pmtu, etc). if i ping from the router to the internet, it works ok however if i ping from inside my lan to the internet, the first 30-70 pings works, then it stops working (i.e. 100% packet lost after the first 30-70) using tcpdump inside my router shows the icmps going through the wan interface but none come back. any idea ? erez. ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il -- Frank Lloyd Wright - TV is chewing gum for the eyes. - http://www.brainyquote.com/quotes/authors/f/frank_lloyd_wright.html ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: ping problems
On Wed, May 27, 2009 at 9:41 AM, Aviv Greenberg avivg...@gmail.com wrote: If you ping another destination during the hang - does it work? a download i started before the ping continues even after the ping is dead If you ifdown and ifup the interfaces (wan + lan) on the router after a hang - is it released? an icmp packet is short so i don't think this is the case but: what is the MTU on the lan/wan? as you said, the ping packets are smaller then the mtu (and all are same size) also ping is connectionless, so it makes sense if the lost packets are spread randomly but not if in the beginning all pass and in the end all fail Also, use a tool like mtr http://en.wikipedia.org/wiki/Mtr_(My_traceroute)http://en.wikipedia.org/wiki/Mtr_%28My_traceroute%29to detect any packet loss along the route. mtr works from both router and lan there is some packet lost on the closer servers, but none at the target but it is the same for both router and lan. thanks, erez. 2009/5/27 Erez D erez0...@gmail.com: hi i have an openwrt (linux) router, with regular firewall rules (nat, related+established,clamp-mss-to-pmtu, etc). if i ping from the router to the internet, it works ok however if i ping from inside my lan to the internet, the first 30-70 pings works, then it stops working (i.e. 100% packet lost after the first 30-70) using tcpdump inside my router shows the icmps going through the wan interface but none come back. any idea ? erez. ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il -- Frank Lloyd Wright - TV is chewing gum for the eyes. - http://www.brainyquote.com/quotes/authors/f/frank_lloyd_wright.html ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: ping problems
Try netstat -s to checks for errors/drops on the WAN interface. Anything interesting? If a ping from the router always succeeds, and after some time fails from the lan AND during failure you see the packets go from the lan out to the wan but doesn't come back at all - it sounds like something is wrong with the outgoing ping request packet. Did you see any difference between a goog ping and bad ping packets? On Wed, May 27, 2009 at 10:05, Erez D erez0...@gmail.com wrote: On Wed, May 27, 2009 at 9:41 AM, Aviv Greenberg avivg...@gmail.com wrote: If you ping another destination during the hang - does it work? a download i started before the ping continues even after the ping is dead If you ifdown and ifup the interfaces (wan + lan) on the router after a hang - is it released? an icmp packet is short so i don't think this is the case but: what is the MTU on the lan/wan? as you said, the ping packets are smaller then the mtu (and all are same size) also ping is connectionless, so it makes sense if the lost packets are spread randomly but not if in the beginning all pass and in the end all fail Also, use a tool like mtr http://en.wikipedia.org/wiki/Mtr_(My_traceroute) to detect any packet loss along the route. mtr works from both router and lan there is some packet lost on the closer servers, but none at the target but it is the same for both router and lan. thanks, erez. 2009/5/27 Erez D erez0...@gmail.com: hi i have an openwrt (linux) router, with regular firewall rules (nat, related+established,clamp-mss-to-pmtu, etc). if i ping from the router to the internet, it works ok however if i ping from inside my lan to the internet, the first 30-70 pings works, then it stops working (i.e. 100% packet lost after the first 30-70) using tcpdump inside my router shows the icmps going through the wan interface but none come back. any idea ? erez. ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il -- Frank Lloyd Wright - TV is chewing gum for the eyes. - http://www.brainyquote.com/quotes/authors/f/frank_lloyd_wright.html -- Mitch Hedberg - My fake plants died because I did not pretend to water them. - http://www.brainyquote.com/quotes/authors/m/mitch_hedberg.html ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
