22 Input Packets -------------------------------- Input packet 1: First the packet coming in: Router 1, Input Port A4 VERS = 4, HLEN = 5, ToS = 0, TL = 255 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 17, CheckS = 0 SourceAddr = 172.18.248.15 DestAddr = 172.16.203.53 Number of data bytes = 235 Dest Network = 2: 172.16.192.0/20 Output Port A2, direct delivery to host on network II. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 255 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 17, CheckS = 0 SourceAddr = 172.18.248.15 DestAddr = 172.16.203.53 DataField = 235 bytes --------------------------- Input packet 2: First the packet coming in: Router 1, Input Port A3 VERS = 4, HLEN = 5, ToS = 0, TL = 341 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 17, CheckS = 0 SourceAddr = 172.19.63.55 DestAddr = 172.18.242.54 Number of data bytes = 321 Dest Network = 10: 172.18.242.0/24 Output Port A2, forward to A24 on R11. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 341 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 17, CheckS = 0 SourceAddr = 172.19.63.55 DestAddr = 172.18.242.54 DataField = 321 bytes --------------------------- Input packet 3: First the packet coming in: Router 1, Input Port A2 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.19.48.55 DestAddr = 172.17.204.15 Number of data bytes = 199 For R1 itself: To higher level software --------------------------- Input packet 4: First the packet coming in: Router 1, Input Port A2 VERS = 4, HLEN = 9, ToS = 0, TL = 682 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.18.241.56 DestAddr = 172.16.192.15 Option 1 = 1, No-OP; Option 2 = 137, Strict Source Route; L = 15, P = 8 extra Address 1 = 172.16.192.14 extra Address 2 = 172.17.204.14 extra Address 3 = 172.18.248.57 Number of data bytes = 646 Strict Source Route, OK thus far, Next Network = 4: 172.17.204.0/24 Output Port A4, direct delivery to host on network IV. Next address had better be a router Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 9, ToS = 0, TL = 682 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 6, CheckS = 0 SourceAddr = 172.18.241.56 DestAddr = 172.17.204.14 Option1 = 1, Option2 = 137, L = 15, P = 12 extra Address 1 = 172.16.192.14 extra Address 2 = 172.17.204.15 extra Address 3 = 172.18.248.57 DataField = 646 bytes --------------------------- Input packet 5: First the packet coming in: Router 1, Input Port A5 VERS = 4, HLEN = 5, ToS = 0, TL = 10922 Ident = 37449, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 42, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 Number of data bytes = 10902 Dest Network = 2: 172.16.192.0/20 Output Port A2, direct delivery to host on network II. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 37449, Flags = 1, FragOffset = 0 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 1480 bytes Fragment 2 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 37449, Flags = 1, FragOffset = 185 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 1480 bytes Fragment 3 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 37449, Flags = 1, FragOffset = 370 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 1480 bytes Fragment 4 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 37449, Flags = 1, FragOffset = 555 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 1480 bytes Fragment 5 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 37449, Flags = 1, FragOffset = 740 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 1480 bytes Fragment 6 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 37449, Flags = 1, FragOffset = 925 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 1480 bytes Fragment 7 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 37449, Flags = 1, FragOffset = 1110 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 1480 bytes Fragment 8 VERS = 4, HLEN = 5, ToS = 0, TL = 562 Ident = 37449, Flags = 0, FragOffset = 1295 TTL = 41, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.102 DestAddr = 172.16.194.15 DataField = 542 bytes --------------------------- Input packet 6: First the packet coming in: Router 1, Input Port A5 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.17.240.165 DestAddr = 172.16.192.15 Number of data bytes = 199 For R1 itself: To higher level software --------------------------- Input packet 7: First the packet coming in: Router 1, Input Port A1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.16.5.165 DestAddr = 255.255.255.255 Number of data bytes = 199 Limited Broadcast, to higher level software of Router R1. --------------------------- Input packet 8: First the packet coming in: Router 1, Input Port A1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.16.5.165 DestAddr = 172.16.15.255 Number of data bytes = 199 direct broadcast to network 1, from network 1. To R1 software only. --------------------------- Input packet 9: First the packet coming in: Router 1, Input Port A4 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 172.16.15.255 Number of data bytes = 199 To Router R1 software AND Output port A1, direct broadcast to network 1. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 172.16.15.255 DataField = 199 bytes --------------------------- Input packet 10: First the packet coming in: Router 1, Input Port A4 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 172.16.31.255 Number of data bytes = 199 unknown network, use default route 172.0.0.0/8 Output Port A3, forward to A14 on R6 Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 172.16.31.255 DataField = 199 bytes --------------------------- Input packet 11: First the packet coming in: Router 1, Input Port A4 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 128.243.32.243 Number of data bytes = 199 unknown network, use default route 0.0.0.0/0 Output Port A3, forward to A14 on R6 Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 128.243.32.243 DataField = 199 bytes --------------------------- Input packet 12: First the packet coming in: Router 7, Input Port A16 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 172.16.31.255 Number of data bytes = 199 unknown network = 14: 172.0.0.0/8 drop packet, send ICMP ``Network Unknown''. --------------------------- Input packet 13: First the packet coming in: Router 7, Input Port A16 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 128.243.32.243 Number of data bytes = 199 Dest Network = 15: 0.0.0.0/0 Output Port A17, forward to NJIT router Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.59 DestAddr = 128.243.32.243 DataField = 199 bytes --------------------------- Input packet 14: First the packet coming in: Router 7, Input Port A17 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 128.235.32.243 DestAddr = 172.16.31.255 Number of data bytes = 199 unknown network = 14: 172.0.0.0/8 drop packet, send ICMP ``Network Unknown''. --------------------------- Input packet 15: First the packet coming in: Router 7, Input Port A17 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 128.243.32.243 DestAddr = 172.18.240.59 Number of data bytes = 199 Dest Network = 6: 172.18.240.0/24 Output Port A16, forward to A15 on R6. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 6, CheckS = 0 SourceAddr = 128.243.32.243 DestAddr = 172.18.240.59 DataField = 199 bytes --------------------------- Input packet 16: First the packet coming in: Router 1, Input Port A1 VERS = 4, HLEN = 8, ToS = 0, TL = 650 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 27, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.60 DestAddr = 172.16.0.15 Option 1 = 1, No-OP; Option 2 = 137, Strict Source Route; L = 11, P = 8 extra Address 1 = 172.16.0.14 extra Address 2 = 172.17.204.61 Number of data bytes = 618 Strict Source Route, OK thus far, Next Network = 4: 172.17.204.0/24 Output Port A4, direct delivery to host on network IV. Next address can be either host or router Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 8, ToS = 0, TL = 650 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 26, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.60 DestAddr = 172.17.204.61 Option1 = 1, Option2 = 137, L = 11, P = 12 extra Address 1 = 172.16.0.14 extra Address 2 = 172.17.204.15 DataField = 618 bytes --------------------------- Input packet 17: First the packet coming in: Router 1, Input Port A1 VERS = 4, HLEN = 5, ToS = 0, TL = 4348 Ident = 39321, Flags = 1, DF = 0, More = 1, FragOffset = 541 TTL = 64, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 Number of data bytes = 4328 Dest Network = 11: 172.18.241.0/24 Output Port A2, forward to A18 on R8. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 39321, Flags = 1, FragOffset = 541 TTL = 63, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 DataField = 1480 bytes Fragment 2 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 39321, Flags = 1, FragOffset = 726 TTL = 63, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 DataField = 1480 bytes Fragment 3 VERS = 4, HLEN = 5, ToS = 0, TL = 1388 Ident = 39321, Flags = 1, FragOffset = 911 TTL = 63, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 DataField = 1368 bytes --------------------------- Input packet 18: First the packet coming in: Router 1, Input Port A3 VERS = 4, HLEN = 5, ToS = 0, TL = 10922 Ident = 37449, Flags = 2, DF = 1, More = 0, FragOffset = 0 TTL = 42, PROT = 6, CheckS = 0 SourceAddr = 172.19.11.63 DestAddr = 172.16.9.64 Number of data bytes = 10902 DF set and packet too large. Drop packet and send ICMP --------------------------- Input packet 19: First the packet coming in: Router 1, Input Port A1 VERS = 4, HLEN = 5, ToS = 0, TL = 4348 Ident = 39321, Flags = 0, DF = 0, More = 0, FragOffset = 541 TTL = 64, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 Number of data bytes = 4328 Dest Network = 11: 172.18.241.0/24 Output Port A2, forward to A18 on R8. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 39321, Flags = 1, FragOffset = 541 TTL = 63, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 DataField = 1480 bytes Fragment 2 VERS = 4, HLEN = 5, ToS = 0, TL = 1500 Ident = 39321, Flags = 1, FragOffset = 726 TTL = 63, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 DataField = 1480 bytes Fragment 3 VERS = 4, HLEN = 5, ToS = 0, TL = 1388 Ident = 39321, Flags = 0, FragOffset = 911 TTL = 63, PROT = 17, CheckS = 0 SourceAddr = 172.18.240.61 DestAddr = 172.18.241.62 DataField = 1368 bytes --------------------------- Input packet 20: First the packet coming in: Router 1, Input Port A2 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 31, PROT = 6, CheckS = 0 SourceAddr = 172.16.195.102 DestAddr = 172.18.242.102 Number of data bytes = 199 inport == outport AND source directly reachable through that port: send ICMP redirect AND send packet. Dest Network = 10: 172.18.242.0/24 Output Port A2, forward to A24 on R11. Next the packet(s) going out: Fragment 1 VERS = 4, HLEN = 5, ToS = 0, TL = 219 Ident = 43690, Flags = 0, FragOffset = 0 TTL = 30, PROT = 6, CheckS = 0 SourceAddr = 172.16.195.102 DestAddr = 172.18.242.102 DataField = 199 bytes --------------------------- Input packet 21: First the packet coming in: Router 1, Input Port A2 VERS = 4, HLEN = 8, ToS = 0, TL = 650 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 27, PROT = 6, CheckS = 0 SourceAddr = 172.19.48.25 DestAddr = 172.16.192.15 Option 1 = 1, No-OP; Option 2 = 137, Strict Source Route; L = 11, P = 12 extra Address 1 = 172.18.241.14 extra Address 2 = 172.16.192.14 Number of data bytes = 618 For R1 itself: To higher level software. (Even though strict sourceroute) --------------------------- Input packet 22: First the packet coming in: Router 1, Input Port A2 VERS = 4, HLEN = 8, ToS = 0, TL = 650 Ident = 43690, Flags = 0, DF = 0, More = 0, FragOffset = 0 TTL = 27, PROT = 6, CheckS = 0 SourceAddr = 172.18.240.60 DestAddr = 172.16.0.15 Option 1 = 1, No-OP; Option 2 = 137, Strict Source Route; L = 11, P = 8 extra Address 1 = 172.16.0.14 extra Address 2 = 172.17.204.61 Number of data bytes = 618 Strict Source Route and destination address is not incoming interface: drop packet, send ICMP error message ---------------------------