--- Michel Santos <michel@xxxxxxxxxxxxxx> wrote: > > pinky you disse na ultima mensagem: > > finallyyyyyyyyyyy > > > > I figured it out, with your help of course > > > > It?s not a squid issue , in fact my satellite > provider > > NewSky has a defected Cisco interface in its site, > > which duplicate each packet I received ( Every > request > > I send I receive a duplicate answer ) > > I called the provider and told them about the > > duplicated packets I received from them , and they > > solve change the defected interface. > > > > just curious, how an interface would do that? > > Other reason as tcp retransmission timeout > exceedings (which BTW would > resend one or another package not all) I can not > even imagin a reason for > that other as an malicious attack (syn flood) > because under normal > circunstancies the package sender *will_not* try > retransmission endless > but mark the target unreachable > Well it is very rare , which when you ping a site you get a duplicate ping . and when I checked it with tcpdump I see it was so clear each packet i send I recieve double identical packet , this case can happenned ( as far as i know ) in three cases : 1> if you configured your gateway as a broadcast address 2> if assigne the same frequency to more than one site ( in satellite communications ) 3> defected interface ( and thats what NewSky told me ) 4> and I heard that misconfigured EIGRP will do that too. > > In fact squid was getting double answer so , it > does > > not know what to do > > > > I guess squid would not get such packages at all but > should be discarted > by your router at layer 3 or by your OS at layer 4 > level where are checked > tcp flags and sequence numbers before they go to the > application layer. > yes I theoritically thats right , but thats whats happenned the packet does not discarded > > michel > > ... > > > > > **************************************************** > Datacenter Matik http://datacenter.matik.com.br > E-Mail e Data Hosting Service para Profissionais. > **************************************************** > > Be pink or not to be ____________________________________________________________________________________ Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. http://smallbusiness.yahoo.com/webhosting
