1 Match on IPv4 header options like source routing, record route,
2 timestamp and router-alert.
5 To match packets with the flag strict source routing.
8 To match packets with the flag loose source routing.
11 To match packets with no flag for source routing.
13 .B "\fR[\fB!\fR]\fB --rr"
14 To match packets with the RR flag.
16 .B "\fR[\fB!\fR]\fB --ts"
17 To match packets with the TS flag.
19 .B "\fR[\fB!\fR]\fB --ra"
20 To match packets with the router-alert option.
22 .B "\fR[\fB!\fR]\fB --any-opt"
23 To match a packet with at least one IP option, or no IP option
24 at all if ! is chosen.
28 $ iptables -A input -m ipv4options --rr -j DROP
29 will drop packets with the record-route flag.
31 $ iptables -A input -m ipv4options --ts -j DROP
32 will drop packets with the timestamp flag.