TCP IP Illustrated

0 2 0004218 00042 3 4980528 49763 4 4984503 00040 5

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Unformatted text preview: ents the datagrams at the source host. This is different from earlier examples where IP sends the datagram that is passed to it by UDP and allows the router with the smaller MTU (bsdi in this case) to 1 0.0 2 0.004218 (0.0042) 3 4.980528 (4.9763) 4 4.984503 (0.0040) 5 9.870407 (4.8859) 6 9.960056 (0.0896) 14.940338 solaris.38196 > slip.discard: udp 650 (DF) (4.9803) bsdi > solaris: icmp: 14.944466 slip unreachable - need to frag, mtu = 0 (0.0041) (DF) 19.890015 solaris.38196 > slip.discard: udp 650 (4.9455) (frag 47944:552@0+) 19.950463 solaris > slip: (frag 47944:106@552) (0.0604) 24.870401 solaris.38196 > slip.discard: udp 650 (4.9199) (frag 47945:552@0+) 24.960038 solaris > slip: (frag 47945:1060552) (0.0896) 29.880182 solaris.38196 > slip.discard: udp 650 (4.9201) (frag 47946:552@0+) 7 8 9 10 11 12 13 solaris.38196 > slip.discard: udp 650 (DF) bsdi > solaris: icmp: slip unreachable - need to frag, mtu = 0 (DF) solaris.38196 > slip.discard: udp 650 (DF) bsdi > solaris: icmp: slip unreachable - need to frag, mtu = 0 (DF) solaris.38196 > slip.discard: udp 650 (frag 47942:552@0+) solaris > slip: (frag 47942:106(3552) file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/udp_user.htm (14 of 29) [12/09/2001 14.46.58] Chapter 11. UDP: User Datagram Protocol 14 15 16 17 18 19 20 29.940498 (0.0603) 34.860607 (4.9201) 34.950051 (0.0894) 39.870216 (4.9202) 39.930443 (0.0602) 44.940485 (5.0100) 44.944432 (0.0039) solaris > slip: (frag 47946:1060552) solaris.38196 > slip.discard: udp 650 (frag 47947:552@0+) solaris > slip: (frag 47947:1060552) solaris.38196 > slip.discard: udp 650 (frag 47948:552@0+) solaris > slip: (frag 47948:106@552) solaris.38196 > slip.discard: udp 650 (DF) bsdi > solaris: icmp: slip unreachable - need to frag, mtu = 0 (DF) Figure 11.14 Path MTU discovery using UDP. do the fragmentation. Since the ICMP "can't fragment" message didn't specify the next-hop MTU, it appears that IP guesses that an MTU of 576 i...
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