IPT_ICMP_PORT_UNREACHABLE, "ICMP port unreachable (default)"},
{"icmp-proto-unreachable", "proto-unreach",
IPT_ICMP_PROT_UNREACHABLE, "ICMP protocol unreachable"},
- {"tcp-reset", "rst",
- IPT_TCP_RESET, "for TCP only: faked TCP RST"},
{"echo-reply", "echoreply",
- IPT_ICMP_ECHOREPLY, "for ICMP echo only: faked ICMP echo reply"},
+ IPT_ICMP_ECHOREPLY, "for ICMP echo only: faked ICMP echo reply"}
};
static void
.BR icmp-port-unreachable or
.BR icmp-proto-unreachable
which return the appropriate ICMP error message (net-unreachable is
-the default). The following special types are also allowed:
-.B tcp-reset
-is only valid if the rule also specifies
-.BR "-p tcp" ,
-and generates a TCP reset packet in response. This is generally not a
-good idea (modern stacks should deal with ICMPs on TCP connection
-initiation attempts).
+the default). The option
.B echo-reply
-can only be used for rules which specify an ICMP ping packet, and
-generates a ping reply.
+is also allowed; it can only be used for rules which specify an ICMP
+ping packet, and generates a ping reply.
.SS TOS
This is used to set the 8-bit Type of Service field in the IP header.
It is only valid in the