Number of packets is 10 .

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Input packet 0:

Router 1, Input Port A3

VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 255 ;
Ident = 21845 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ;
TTL = 31 , Prot = 6 , H.Checksum = 0 ;
Source Address: 20.20.20.20
Dest Address:   172.172.31.255
No Options Present.
Number of data bytes = 235 . 

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Input packet 1:

Router 1, Input Port A1

VERS = 4 , HLEN = 5 , DSCP = 4 , ECT = 0 , CE = 0 , TL = 241 ;
Ident = 21845 , U = 0 , DF = 0 , M = 0 , FragOffset = 0 ;
TTL = 63 , Prot = 17 , H.Checksum = 0 ;
Source Address: 20.20.20.20
Dest Address:   172.172.21.15
No Options Present.
Number of data bytes = 221 . 

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Input packet 2:

Router 1, Input Port A2

VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 5448 ;
Ident = 43690 , U = 0 , DF = 0 , M = 0 , FragOffset = 175 ;
TTL = 31 , Prot = 17 , H.Checksum = 0 ;
Source Address: 172.172.32.15
Dest Address:   172.172.8.7
No Options Present.
Number of data bytes = 5428 . 

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Input packet 3:

Router 1, Input Port A3

VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 5376 ;
Ident = 21845 , U = 0 , DF = 0 , M = 1 , FragOffset = 0 ;
TTL = 63 , Prot = 17 , H.Checksum = 0 ;
Source Address: 172.172.129.17
Dest Address:   172.172.17.17
No Options Present.
Number of data bytes = 5356 . 

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Input packet 4:
Error in input, VERS not 4

Input packet 4 is bad: error = -2 .
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Input packet 5:

Router 1, Input Port A2

VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 5376 ;
Ident = 21845 , U = 0 , DF = 1 , M = 0 , FragOffset = 0 ;
TTL = 31 , Prot = 6 , H.Checksum = 0 ;
Source Address: 172.172.129.17
Dest Address:   172.172.255.255
No Options Present.
Number of data bytes = 5356 . 

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Input packet 6:
Error in input: (2 , 3) element  not zero - one

Input packet 6 is bad: error = -1 .
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Input packet 7:

Router 1, Input Port A2

VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 0 , CE = 0 , TL = 5376 ;
Ident = 21845 , U = 0 , DF = 1 , M = 0 , FragOffset = 0 ;
TTL = 1 , Prot = 17 , H.Checksum = 0 ;
Source Address: 172.172.129.17
Dest Address:   172.172.17.17
No Options Present.
Number of data bytes = 5356 . 

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Input packet 8:
Error in input: (0 , 22) element  not zero - one

Input packet 8 is bad: error = -1 .
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Input packet 9:

Router 1, Input Port A4

VERS = 4 , HLEN = 5 , DSCP = 0 , ECT = 1 , CE = 0 , TL = 4460 ;
Ident = 43690 , U = 0 , DF = 0 , M = 1 , FragOffset = 555 ;
TTL = 10 , Prot = 17 , H.Checksum = 0 ;
Source Address: 170.170.17.17
Dest Address:   255.255.255.255
No Options Present.
Number of data bytes = 4440 .