Lab 7 Writeup ============= My name: Catfood My SUNet ID: 998244353 I collaborated with: An orange cat This lab took me about `1` hours to do. Solo portion: 就，照着敲命令就好了。不过不知道为啥，好像有点慢而且有概率会失败，需要耐心一点。 Section 3 --------- **server** run first ``` ➜ build git:(master) ./apps/lab7 server cs144.keithw.org 3000 DEBUG: Network interface has Ethernet address 02:00:00:09:60:3c and IP address 172.16.0.1 DEBUG: Network interface has Ethernet address 02:00:00:0c:50:e4 and IP address 10.0.0.172 DEBUG: adding route 172.16.0.0/12 => (direct) on interface 0 DEBUG: adding route 10.0.0.0/8 => (direct) on interface 1 DEBUG: adding route 192.168.0.0/16 => 10.0.0.192 on interface 1 DEBUG: Network interface has Ethernet address 8a:0e:de:4e:97:19 and IP address 172.16.0.100 DEBUG: Listening for incoming connection... New connection from 192.168.0.50:16828. hello world hello client Oh!!!!!!! DEBUG: Inbound stream from 192.168.0.50:16828 finished cleanly. DEBUG: Waiting for clean shutdown... DEBUG: Outbound stream to 192.168.0.50:16828 finished (1 byte still in flight). DEBUG: Outbound stream to 192.168.0.50:16828 has been fully acknowledged. DEBUG: TCP connection finished cleanly. done. Exiting... done. ``` **client** ``` ➜ build git:(master) ./apps/lab7 client cs144.keithw.org 3001 DEBUG: Network interface has Ethernet address 02:00:00:32:12:73 and IP address 192.168.0.1 DEBUG: Network interface has Ethernet address 02:00:00:da:5c:7d and IP address 10.0.0.192 DEBUG: adding route 192.168.0.0/16 => (direct) on interface 0 DEBUG: adding route 10.0.0.0/8 => (direct) on interface 1 DEBUG: adding route 172.16.0.0/12 => 10.0.0.172 on interface 1 DEBUG: Network interface has Ethernet address 6e:18:17:8b:27:38 and IP address 192.168.0.50 DEBUG: Connecting from 192.168.0.50:16828... DEBUG: Connecting to 172.16.0.100:1234... Successfully connected to 172.16.0.100:1234. hello world hello client Oh!!!!!!! DEBUG: Outbound stream to 172.16.0.100:1234 finished (1 byte still in flight). DEBUG: Outbound stream to 172.16.0.100:1234 has been fully acknowledged. DEBUG: Inbound stream from 172.16.0.100:1234 finished cleanly. DEBUG: Waiting for lingering segments (e.g. retransmissions of FIN) from peer... DEBUG: Waiting for clean shutdown... DEBUG: TCP connection finished cleanly. done. Exiting... done. ``` Section 4 ---------- server启动后，会等待连接到来才发送数据，因此可以先执行。但是有个巨大的问题，就是不是很稳定，而且发送极其缓慢，只能耐心了。 **server** ``` ➜ build git:(master) ✗ dd if=/dev/urandom bs=1M count=1 of=/tmp/big.txt 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.00460547 s, 228 MB/s ➜ build git:(master) ✗ ./apps/lab7 server cs144.keithw.org 3000 < /tmp/big.txt DEBUG: Network interface has Ethernet address 02:00:00:f0:8f:3f and IP address 172.16.0.1 DEBUG: Network interface has Ethernet address 02:00:00:82:df:65 and IP address 10.0.0.172 DEBUG: adding route 172.16.0.0/12 => (direct) on interface 0 DEBUG: adding route 10.0.0.0/8 => (direct) on interface 1 DEBUG: adding route 192.168.0.0/16 => 10.0.0.192 on interface 1 DEBUG: Network interface has Ethernet address 86:87:fa:05:41:74 and IP address 172.16.0.100 DEBUG: Listening for incoming connection... New connection from 192.168.0.50:25255. DEBUG: Inbound stream from 192.168.0.50:25255 finished cleanly. DEBUG: Waiting for clean shutdown... DEBUG: Outbound stream to 192.168.0.50:25255 finished (64000 bytes still in flight). DEBUG: Outbound stream to 192.168.0.50:25255 has been fully acknowledged. DEBUG: TCP connection finished cleanly. done. Exiting... done. ``` **client** ``` ➜ build git:(master) ✗ /tmp/big-received.txt DEBUG: Network interface has Ethernet address 02:00:00:fe:a0:99 and IP address 192.168.0.1 DEBUG: Network interface has Ethernet address 02:00:00:31:4a:3c and IP address 10.0.0.192 DEBUG: adding route 192.168.0.0/16 => (direct) on interface 0 DEBUG: adding route 10.0.0.0/8 => (direct) on interface 1 DEBUG: adding route 172.16.0.0/12 => 10.0.0.172 on interface 1 DEBUG: Network interface has Ethernet address 3e:6d:08:df:93:af and IP address 192.168.0.50 DEBUG: Connecting from 192.168.0.50:25255... DEBUG: Connecting to 172.16.0.100:1234... Successfully connected to 172.16.0.100:1234. DEBUG: Outbound stream to 172.16.0.100:1234 finished (1 byte still in flight). DEBUG: Outbound stream to 172.16.0.100:1234 has been fully acknowledged. DEBUG: Inbound stream from 172.16.0.100:1234 finished cleanly. DEBUG: Waiting for lingering segments (e.g. retransmissions of FIN) from peer... DEBUG: Waiting for clean shutdown... DEBUG: TCP connection finished cleanly. done. Exiting... done. ➜ sponge git:(master) ✗ sha256sum /tmp/big.txt f2c54a920a34e125ea4478735f5f07af926c40abe9f0f695272b689370ce6782 /tmp/big.txt ➜ sponge git:(master) ✗ sha256sum /tmp/big-received.txt f2c54a920a34e125ea4478735f5f07af926c40abe9f0f695272b689370ce6782 /tmp/big-received.txt ``` **离谱的发送时间** 发了快8分钟才发完（下面的log显示，发600K花了4分多钟，大概重传了不知道多少次了已经），本来打算分析一波原因的，但是，这网卡都是走的自己写的，压根没办法抓包啊，只能看他打印的 debug，过于抽象，所以就没分析了。不过大概率是外部设备的问题，国内网络环境比较的复杂，不过能发完应该就问题不大了（大雾）。 ``` ➜ sponge git:(master) ✗ ls -lh /tmp | grep big -rw-rw-r-- 1 catfood catfood 451K Feb 18 15:42 big-received.txt -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:29 big.txt ➜ sponge git:(master) ✗ ls -lh /tmp | grep big -rw-rw-r-- 1 catfood catfood 528K Feb 18 15:42 big-received.txt -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:29 big.txt ➜ sponge git:(master) ✗ ls -lh /tmp | grep big -rw-rw-r-- 1 catfood catfood 654K Feb 18 15:44 big-received.txt -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:29 big.txt ➜ sponge git:(master) ✗ ls -lh /tmp | grep big -rw-rw-r-- 1 catfood catfood 875K Feb 18 15:45 big-received.txt -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:29 big.txt ➜ sponge git:(master) ✗ ls -lh /tmp | grep big -rw-rw-r-- 1 catfood catfood 922K Feb 18 15:45 big-received.txt -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:29 big.txt ➜ sponge git:(master) ✗ ls -lh /tmp | grep big -rw-rw-r-- 1 catfood catfood 985K Feb 18 15:46 big-received.txt -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:29 big.txt ➜ sponge git:(master) ✗ ls -lh /tmp | grep big -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:46 big-received.txt -rw-rw-r-- 1 catfood catfood 1.0M Feb 18 15:29 big.txt ``` Group portion: 没有人和我一起玩（哇哇大哭~） Creative portion (optional): [] Other remarks: [] - Optional: I had unexpected difficulty with: [describe] - Optional: I think you could make this lab better by: [describe] - Optional: I was surprised by: [describe] - Optional: I'm not sure about: [发的多少有点慢的离谱，不知道是哪里的问题] 完结撒花。虽然不知道以后这个实验的服务器会不会继续开着，因为有些实验，还不得不用它的服务器，如果没了就做不了了捏。