Problems with more than one iptables-router based are pretty obvious. This 'new but not syn' feature was apparently built exactly for these situations. Altough, I'm analising this in a specific situation: only 1 iptables based router. Dropping INVALID packets seems to not deal with these packets. As I stated, iptables recognizes them as NEW state. So a rule that drop INVALID ones wouldnt care about them. Sincerily, Leonardo Rodrigues ----- Original Message ----- From: <sekureat_private> To: "Leonardo Rodrigues" <coelhoat_private> Sent: Tuesday, December 11, 2001 4:38 PM Subject: Re: iptables 'syn but not new' packets > Although this should be safe for single machines, such a setting > may cause problems for LANs which have multiple routers connecting them. > > Suppose the SYN and the SYN/ACK travel through one router, but the ACK, > or, perhaps some other packets travel through another router. > Packets seen by this second router are classified NEW or INVALID > by iptables. > > Since dropping INVALID-classified packets appears to be a common practice, > I may be overlooking something. Any ideeas?
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