Number of packets is 24 . --------------------------------------- Input packet 0: First the packet coming in: Router 1, Input Port A4 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 204 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 51 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.9 No Options Present. Number of data bytes = 184 . Source Network is: 13 : 10.2.64.0/22 . Destination Network (possibly after SSR rotation) is: 1 : 10.1.1.0/24 . Output Port is: A1 . Next subnet is: 1 : 10.1.1.0/24 . Direct Delivery to interface on network 1 . This may include the case of SSR. Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 204 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 50 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.9 No Options Present. Number of data bytes = 184 . --------------------------------------- Input packet 1: First the packet coming in: Router 1, Input Port A4 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 51 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.9 No Options Present. Number of data bytes = 1480 . Source Network is: 13 : 10.2.64.0/22 . Destination Network (possibly after SSR rotation) is: 1 : 10.1.1.0/24 . Output Port is: A1 . Next subnet is: 1 : 10.1.1.0/24 . Direct Delivery to interface on network 1 . This may include the case of SSR. Next the fragments going out: Total Size > MTU: Fragmentation required. Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 572 ; Ident = 43970 , U = 0 , DF = 0 , M = 1 , FragOffset = 0 ; TTL = 50 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.9 No Options Present. Number of data bytes = 552 . Fragment 2: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 572 ; Ident = 43970 , U = 0 , DF = 0 , M = 1 , FragOffset = 69 ; TTL = 50 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.9 No Options Present. Number of data bytes = 552 . Fragment 3: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 396 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 138 ; TTL = 50 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.9 No Options Present. Number of data bytes = 376 . --------------------------------------- Input packet 2: First the packet coming in: Router 1, Input Port A4 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 1 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.9 No Options Present. Number of data bytes = 1480 . TTL expired, drop packet, send ICMP. --------------------------------------- Input packet 3: First the packet coming in: Router 1, Input Port A4 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 1 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.64.128 Dest Address: 10.1.1.1 No Options Present. Number of data bytes = 1480 . Packet destined for router R=1, to higher level software. --------------------------------------- Input packet 4: First the packet coming in: Router 1, Input Port A1 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 576 ; Ident = 23672 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 16 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.32 Dest Address: 10.2.8.12 No Options Present. Number of data bytes = 556 . Source Network is: 1 : 10.1.1.0/24 . Destination Network (possibly after SSR rotation) is: 7 : 10.2.8.0/22 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A9 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 576 ; Ident = 23672 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 15 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.32 Dest Address: 10.2.8.12 No Options Present. Number of data bytes = 556 . --------------------------------------- Input packet 5: First the packet coming in: Router 1, Input Port A3 VERS = 4 , HLEN = 9 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43562 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 50 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.32.255 Dest Address: 10.1.8.1 2 Options Present. Option 1 is 1 : No-Op. Option 2 is 137 : Strict Source Route, Length = 15 , Pointer = 8 . Number of extra SSR addresses is 3 Extra SSR adress 1 is 10.1.10.128 Extra SSR adress 2 is 10.1.16.128 Extra SSR adress 3 is 10.2.8.1 Number of data bytes = 1464 . Source Network is: 10 : 10.2.32.0/20 . Destination Network (possibly after SSR rotation) is: 5 : 10.1.16.0/20 . Destination (possibly after SSR rotation) is Router Port A7 . Output Port is: A5 . Next subnet is: 5 : 10.1.16.0/20 . Direct Delivery to interface on network 5 . This may include the case of SSR. Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 9 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43562 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 49 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.32.255 Dest Address: 10.1.16.128 2 Options Present. Option 1 is 1 : No-Op. Option 2 is 137 : Strict Source Route, Length = 15 , Pointer = 12 . Number of extra SSR addresses is 3 Extra SSR adress 1 is 10.1.10.128 Extra SSR adress 2 is 10.1.16.1 Extra SSR adress 3 is 10.2.8.1 Number of data bytes = 1464 . --------------------------------------- Input packet 6: First the packet coming in: Router 1, Input Port A4 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 11098 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.34.0 Dest Address: 10.1.0.51 No Options Present. Number of data bytes = 1480 . Source Network is: 10 : 10.2.32.0/20 . Destination Network (possibly after SSR rotation) is: 15 : 10.0.0.0/8 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A19 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 11098 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.34.0 Dest Address: 10.1.0.51 No Options Present. Number of data bytes = 1480 . --------------------------------------- Input packet 7: First the packet coming in: Router 1, Input Port A3 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 23338 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 254 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.4.8.14 Dest Address: 10.4.17.34 No Options Present. Number of data bytes = 4444 . Source Network is: 15 : 10.0.0.0/8 . Destination Network (possibly after SSR rotation) is: 15 : 10.0.0.0/8 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A19 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 23338 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 253 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.4.8.14 Dest Address: 10.4.17.34 No Options Present. Number of data bytes = 4444 . --------------------------------------- Input packet 8: First the packet coming in: Router 1, Input Port A2 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 43348 , U = 0 , DF = 1 , M = 0 , FragOffset = 0 ; TTL = 10 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.65.21 Dest Address: 10.3.0.1 No Options Present. Number of data bytes = 4444 . Source Network is: 13 : 10.2.64.0/22 . Destination Network (possibly after SSR rotation) is: 11 : 10.3.0.0/16 . Destination (possibly after SSR rotation) is Router Port A20 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A19 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 43348 , U = 0 , DF = 1 , M = 0 , FragOffset = 0 ; TTL = 9 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.65.21 Dest Address: 10.3.0.1 No Options Present. Number of data bytes = 4444 . --------------------------------------- Input packet 9: First the packet coming in: Router 3, Input Port A9 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 44887 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 254 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.32.1 Dest Address: 10.2.9.1 No Options Present. Number of data bytes = 4444 . Forbidden Router, go to next packet --------------------------------------- Input packet 10: First the packet coming in: Router 1, Input Port A6 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 44887 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 254 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.48.75 Dest Address: 255.255.255.255 No Options Present. Number of data bytes = 4444 . Limited broadcast, to R1 software only. --------------------------------------- Input packet 11: First the packet coming in: Router 1, Input Port A6 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 44887 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 254 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.48.75 Dest Address: 10.1.63.255 No Options Present. Number of data bytes = 4444 . Direct Broadcast, from destination net: to R1 Software only. --------------------------------------- Input packet 12: First the packet coming in: Router 1, Input Port A3 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 44887 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 254 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.8.75 Dest Address: 10.1.63.255 No Options Present. Number of data bytes = 4444 . Direct Broadcast, from network 3 to network 6 . To router R1 higher level software and broadcast to network 6 Source Network is: 3 : 10.1.8.0/22 . Destination Network (possibly after SSR rotation) is: 6 : 10.1.48.0/20 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Direct Delivery to interface on network 6 . This may include the case of SSR. Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4464 ; Ident = 44887 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 253 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.8.75 Dest Address: 10.1.63.255 No Options Present. Number of data bytes = 4444 . --------------------------------------- Input packet 13: First the packet coming in: Router 1, Input Port A6 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.8.64 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . Source Network is: 7 : 10.2.8.0/22 . Destination Network (possibly after SSR rotation) is: 16 : 0.0.0.0/0 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A19 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.8.64 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . --------------------------------------- Input packet 14: First the packet coming in: Router 1, Input Port A6 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.48.64 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . Input Port equals Output Port and Source Network is directly reachable: send ICMP redirect and route packet: Source Network is: 6 : 10.1.48.0/20 . Destination Network (possibly after SSR rotation) is: 16 : 0.0.0.0/0 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A19 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.48.64 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . --------------------------------------- Input packet 15: First the packet coming in: Router 1, Input Port A5 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.1.1 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . Source Network is: 8 : 10.2.0.0/20 . Destination Network (possibly after SSR rotation) is: 16 : 0.0.0.0/0 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A19 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.1.1 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . --------------------------------------- Input packet 16: First the packet coming in: Router 1, Input Port A5 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.1.1 Dest Address: 10.2.130.2 No Options Present. Number of data bytes = 1480 . Source Network is: 8 : 10.2.0.0/20 . Destination Network (possibly after SSR rotation) is: 15 : 10.0.0.0/8 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A19 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.1.1 Dest Address: 10.2.130.2 No Options Present. Number of data bytes = 1480 . --------------------------------------- Input packet 17: First the packet coming in: Router 12, Input Port A28 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.1.1 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . Source Network is: 8 : 10.2.0.0/20 . Destination Network (possibly after SSR rotation) is: 16 : 0.0.0.0/0 . Output Port is: A29 . Next subnet is: 14 : 10.3.3.16/28 . Forward to Next Port. Next Port is: A31 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.1.1 Dest Address: 128.135.64.64 No Options Present. Number of data bytes = 1480 . --------------------------------------- Input packet 18: First the packet coming in: Router 12, Input Port A28 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1500 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.2.1.1 Dest Address: 10.2.130.2 No Options Present. Number of data bytes = 1480 . Source Network is: 8 : 10.2.0.0/20 . Destination Network (possibly after SSR rotation) is: 15 : 10.0.0.0/8 . Unknown network, drop packet, send ICMP packet. --------------------------------------- Input packet 19: First the packet coming in: Router 1, Input Port A1 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 515 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.2 Dest Address: 10.2.9.1 No Options Present. Number of data bytes = 495 . Source Network is: 1 : 10.1.1.0/24 . Destination Network (possibly after SSR rotation) is: 7 : 10.2.8.0/22 . Output Port is: A6 . Next subnet is: 6 : 10.1.48.0/20 . Forward to Next Port. Next Port is: A9 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 515 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.2 Dest Address: 10.2.9.1 No Options Present. Number of data bytes = 495 . --------------------------------------- Input packet 20: First the packet coming in: Router 1, Input Port A1 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 515 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.3 Dest Address: 10.2.15.1 No Options Present. Number of data bytes = 495 . Source Network is: 1 : 10.1.1.0/24 . Destination Network (possibly after SSR rotation) is: 8 : 10.2.0.0/20 . Output Port is: A5 . Next subnet is: 5 : 10.1.16.0/20 . Forward to Next Port. Next Port is: A11 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 515 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.3 Dest Address: 10.2.15.1 No Options Present. Number of data bytes = 495 . --------------------------------------- Input packet 21: First the packet coming in: Router 1, Input Port A1 VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 515 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.4 Dest Address: 10.2.6.1 No Options Present. Number of data bytes = 495 . Source Network is: 1 : 10.1.1.0/24 . Destination Network (possibly after SSR rotation) is: 12 : 10.2.4.0/22 . Output Port is: A3 . Next subnet is: 3 : 10.1.8.0/22 . Forward to Next Port. Next Port is: A23 . Next the fragments going out: Fragment 1: VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 515 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.1.1.4 Dest Address: 10.2.6.1 No Options Present. Number of data bytes = 495 . --------------------------------------- Input packet 22: First the packet coming in: Router 1, Input Port A6 VERS = 4 , HLEN = 10 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4410 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.3.0.15 Dest Address: 10.1.48.1 2 Options Present. Option 1 is 1 : No-Op. Option 2 is 137 : Strict Source Route, Length = 19 , Pointer = 12 . Number of extra SSR addresses is 4 Extra SSR adress 1 is 10.2.8.3 Extra SSR adress 2 is 10.1.48.128 Extra SSR adress 3 is 10.1.32.128 Extra SSR adress 4 is 10.2.32.102 Number of data bytes = 4370 . Source Network is: 11 : 10.3.0.0/16 . Destination Network (possibly after SSR rotation) is: 4 : 10.1.32.0/20 . Destination (possibly after SSR rotation) is Router Port A18 . Output Port is: A4 . Next subnet is: 4 : 10.1.32.0/20 . Direct Delivery to interface on network 4 . This may include the case of SSR. Next the fragments going out: Total Size > MTU: Fragmentation required. Fragment 1: VERS = 4 , HLEN = 10 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1496 ; Ident = 43970 , U = 0 , DF = 0 , M = 1 , FragOffset = 0 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.3.0.15 Dest Address: 10.1.32.128 2 Options Present. Option 1 is 1 : No-Op. Option 2 is 137 : Strict Source Route, Length = 19 , Pointer = 16 . Number of extra SSR addresses is 4 Extra SSR adress 1 is 10.2.8.3 Extra SSR adress 2 is 10.1.48.128 Extra SSR adress 3 is 10.1.32.1 Extra SSR adress 4 is 10.2.32.102 Number of data bytes = 1456 . Fragment 2: VERS = 4 , HLEN = 10 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1496 ; Ident = 43970 , U = 0 , DF = 0 , M = 1 , FragOffset = 182 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.3.0.15 Dest Address: 10.1.32.128 2 Options Present. Option 1 is 1 : No-Op. Option 2 is 137 : Strict Source Route, Length = 19 , Pointer = 16 . Number of extra SSR addresses is 4 Extra SSR adress 1 is 10.2.8.3 Extra SSR adress 2 is 10.1.48.128 Extra SSR adress 3 is 10.1.32.1 Extra SSR adress 4 is 10.2.32.102 Number of data bytes = 1456 . Fragment 3: VERS = 4 , HLEN = 10 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 1498 ; Ident = 43970 , U = 0 , DF = 0 , M = 0 , FragOffset = 364 ; TTL = 30 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.3.0.15 Dest Address: 10.1.32.128 2 Options Present. Option 1 is 1 : No-Op. Option 2 is 137 : Strict Source Route, Length = 19 , Pointer = 16 . Number of extra SSR addresses is 4 Extra SSR adress 1 is 10.2.8.3 Extra SSR adress 2 is 10.1.48.128 Extra SSR adress 3 is 10.1.32.1 Extra SSR adress 4 is 10.2.32.102 Number of data bytes = 1458 . --------------------------------------- Input packet 23: First the packet coming in: Router 1, Input Port A6 VERS = 4 , HLEN = 10 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 4410 ; Ident = 43970 , U = 0 , DF = 1 , M = 0 , FragOffset = 0 ; TTL = 31 , Prot = 6 , H.Checksum = 0 ; Source Address: 10.3.0.15 Dest Address: 10.1.48.1 2 Options Present. Option 1 is 1 : No-Op. Option 2 is 137 : Strict Source Route, Length = 19 , Pointer = 12 . Number of extra SSR addresses is 4 Extra SSR adress 1 is 10.2.8.3 Extra SSR adress 2 is 10.1.48.128 Extra SSR adress 3 is 10.1.32.128 Extra SSR adress 4 is 10.2.32.102 Number of data bytes = 4370 . Source Network is: 11 : 10.3.0.0/16 . Destination Network (possibly after SSR rotation) is: 4 : 10.1.32.0/20 . Destination (possibly after SSR rotation) is Router Port A18 . Output Port is: A4 . Next subnet is: 4 : 10.1.32.0/20 . Total Size > MTU: Fragmentation Required. But DF bit set: drop packet, send ICMP.