Thank you so much , i checked a little for our network characteristic
we have thousands of syn packet every second
is there a way to limit a range the syn mtu between 1000-1800 on mx ?
[root@localhost islemler]# tcpdump -nn 'tcp[13] & 2 == 2'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on em1, link-type EN10MB (Ethernet), capture size 65535 bytes
22:10:06.979208 IP 64.233.188.26.25 > 213.238.166.79.39446: Flags [S.], seq 1442487946, ack 2772870502, win 42408, options [mss 1380,sackOK,TS val 736021397 ecr 821225169,nop,wscale 7], length 0
22:10:06.980218 IP 37.123.101.131.80 > 85.132.117.206.3836: Flags [S.], seq 1450946354, ack 3634974204, win 14480, options [mss 1460,sackOK,TS val 3217225880 ecr 9187416,nop,wscale 7], length 0
22:10:06.982865 IP 208.67.1.11.443 > 213.238.172.239.54960: Flags [S.], seq 3742838734, ack 3491591898, win 11680, options [mss 1460], length 0
22:10:06.984078 IP 93.174.93.103.48946 > 213.238.171.197.80: Flags [S], seq 1014144747, win 29200, options [mss 1460,sackOK,TS val 213226102 ecr 0,nop,wscale 7], length 0
22:10:06.986077 IP 93.174.93.103.41036 > 185.9.157.196.80: Flags [S], seq 963414185, win 29200, options [mss 1460,sackOK,TS val 213226108 ecr 0,nop,wscale 7], length 0
22:10:06.989228 IP 173.194.220.26.25 > 213.238.166.76.56603: Flags [S.], seq 3005784396, ack 1821054237, win 42540, options [mss 1430,sackOK,TS val 1717880936 ecr 821225711,nop,wscale 7], length 0
22:10:06.992168 IP 80.236.217.43.62346 > 37.123.99.13.80: Flags [S], seq 2892144143, win 8192, options [mss 1452,nop,wscale 8,nop,nop,sackOK], length 0
22:10:06.992426 IP 37.123.99.13.80 > 80.236.217.43.62346: Flags [S.], seq 1778744980, ack 2892144144, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
22:10:06.992848 IP 185.118.142.80.31739 > 198.31.186.19.22: Flags [S], seq 3946997301, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 498299067 ecr 0], length 0
22:10:06.992943 IP 185.118.142.80.31724 > 198.31.186.5.22: Flags [S], seq 3331660361, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 498299067 ecr 0], length 0
22:10:06.993801 IP 185.118.142.80.31752 > 198.31.186.32.22: Flags [S], seq 1758905277, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 498299068 ecr 0], length 0
22:10:06.993852 IP 185.118.142.80.31748 > 198.31.186.28.22: Flags [S], seq 745465698, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 498299068 ecr 0], length 0
22:10:06.995477 IP 45.55.135.10.42458 > 185.9.156.251.80: Flags [S], seq 3081786914, win 29200, options [mss 1460,sackOK,TS val 1751774 ecr 0,nop,wscale 6], length 0
22:10:06.996231 IP 95.82.131.230.2874 > 37.123.99.13.80: Flags [S], seq 2751335161, win 8192, options [mss 1460,nop,nop,sackOK], length 0
22:10:06.998894 IP 185.118.143.226.62763 > 5.196.7.246.80: Flags [S], seq 2274759170, win 8192, options [mss 1460,nop,nop,sackOK], length 0
22:10:07.001371 IP 173.194.220.27.25 > 213.238.166.79.35239: Flags [S.], seq 3732730745, ack 1833826239, win 42540, options [mss 1430,sackOK,TS val 1731389821 ecr 821225721,nop,wscale 7], length 0
22:10:07.002380 IP 85.158.137.99.25 > 213.238.166.76.53871: Flags [S.], seq 4208165307, ack 1452091138, win 4380, options [mss 1460,nop,nop,TS val 1278707629 ecr 821225751,sackOK,eol], length 0
22:10:07.003715 IP 185.171.88.66.58459 > 37.6.1.117.6881: Flags [S], seq 985513053, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.004321 IP 185.90.81.137.3128 > 58.218.200.148.46285: Flags [S.], seq 1433709853, ack 3574231009, win 14480, options [mss 1460,sackOK,TS val 1857791237 ecr 99247027,nop,wscale 6], length 0
22:10:07.005853 IP 46.150.5.130.3389 > 185.118.142.10.53347: Flags [S.], seq 2801548885, ack 2525067564, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.013722 IP 162.158.210.105.30444 > 185.9.156.148.80: Flags [S], seq 823114944, win 29200, options [mss 1460,nop,nop,sackOK,nop,wscale 10], length 0
22:10:07.013741 IP 46.150.103.116.3389 > 185.118.142.10.53354: Flags [S.], seq 3124588752, ack 1775530236, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.013919 IP 185.9.156.148.80 > 162.158.210.105.30444: Flags [S.], seq 895421771, ack 823114945, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
22:10:07.019195 IP 46.150.105.244.3389 > 185.118.142.10.53357: Flags [S.], seq 1242415396, ack 3616802501, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.020248 IP 46.150.108.29.3389 > 185.118.142.10.53359: Flags [S.], seq 1964264096, ack 681840602, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.023682 IP 186.183.143.156.29955 > 37.123.103.57.23: Flags [S], seq 3510829056, win 14600, options [mss 1460], length 0
22:10:07.025356 IP 46.150.108.254.3389 > 185.118.142.10.53360: Flags [S.], seq 2797634464, ack 1200156262, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.026445 IP 185.118.142.55.11290 > 167.89.200.179.22: Flags [S], seq 3221492566, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 385814529 ecr 0], length 0
22:10:07.026680 IP 185.118.142.55.11424 > 167.89.201.22.22: Flags [S], seq 47552746, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 385814530 ecr 0], length 0
22:10:07.028392 IP 37.123.99.165.80 > 78.182.80.113.38555: Flags [S.], seq 2186475341, ack 2667760937, win 14480, options [mss 1460,sackOK,TS val 387004685 ecr 2317883,nop,wscale 7], length 0
22:10:07.028651 IP 208.180.40.132.25 > 178.20.226.22.56603: Flags [S.], seq 2820323684, ack 2784469514, win 4380, options [mss 1460,nop,nop,TS val 1278669143 ecr 2167564213,sackOK,eol], length 0
22:10:07.029671 IP 46.151.84.75.3389 > 185.118.142.10.53364: Flags [S.], seq 3567298315, ack 1895424507, win 64000, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0
22:10:07.030077 IP 37.123.99.13.80 > 193.125.52.175.52182: Flags [S.], seq 645193683, ack 3767641660, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
22:10:07.031082 IP 66.249.93.91.62170 > 37.123.101.131.80: Flags [S], seq 3945429612, win 42780, options [mss 1380,sackOK,TS val 667426434 ecr 0,nop,wscale 7], length 0
22:10:07.032151 IP 122.200.228.232.25 > 213.238.172.130.2244: Flags [S.], seq 4219821937, ack 2790407854, win 65535, options [mss 1460,sackOK,eol], length 0
22:10:07.040290 IP 89.248.167.173.6275 > 37.123.98.231.18540: Flags [S.], seq 3320851465, ack 717593002, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.041962 IP 213.238.172.16.23 > 112.162.25.101.57425: Flags [S.], seq 3228028277, ack 1807270783, win 0, options [mss 1460,sackOK,TS val 3718395541 ecr 378742201,nop,wscale 7], length 0
22:10:07.046320 IP 185.90.81.156.22 > 121.18.238.109.51075: Flags [S.], seq 1429287015, ack 2347770725, win 14480, options [mss 1460,sackOK,TS val 1806276340 ecr 3494708,nop,wscale 7], length 0
22:10:07.046637 IP 185.118.143.226.62811 > 36.66.114.249.8080: Flags [S], seq 340346029, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK], length 0
22:10:07.047488 IP 178.149.240.10.50448 > 213.238.170.30.80: Flags [S], seq 3978198871, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.047810 IP 213.238.170.30.80 > 178.149.240.10.50448: Flags [S.], seq 3450982954, ack 3978198872, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
22:10:07.050154 IP 185.118.142.225.16474 > 47.90.90.185.22: Flags [S], seq 3985414260, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 1297614294 ecr 0], length 0
22:10:07.055412 IP 185.89.72.69.2606 > 85.153.207.222.23: Flags [S], seq 1436143582, win 32086, length 0
22:10:07.057165 IP 104.25.25.19.80 > 213.238.171.194.47591: Flags [S.], seq 3947645944, ack 3901728852, win 29200, options [mss 1460,nop,nop,sackOK,nop,wscale 10], length 0
22:10:07.064252 IP 185.171.88.56.3389 > 79.137.3.49.51540: Flags [S.], seq 1150590020, ack 2221007522, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.064570 IP 79.137.3.49.51543 > 213.238.171.243.3389: Flags [S], seq 3312534900, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.065567 IP 213.238.170.30.80 > 178.149.240.10.50452: Flags [S.], seq 4092036435, ack 1227162433, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
22:10:07.068469 IP 178.20.228.104.80 > 173.252.74.112.58654: Flags [S.], seq 1384434923, ack 2019997577, win 14480, options [mss 1460,sackOK,TS val 3430005132 ecr 3815919272,nop,wscale 7], length 0
22:10:07.069935 IP 208.146.36.220.80 > 185.182.191.68.63959: Flags [S.], seq 3879436984, ack 2417579047, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
22:10:07.073823 IP 31.187.74.10.52856 > 178.20.229.229.25565: Flags [S], seq 2074929964, win 29200, options [mss 1400,sackOK,TS val 1402888449 ecr 0,nop,wscale 7], length 0
22:10:07.074180 IP 195.211.221.116.80 > 185.118.143.184.61790: Flags [S.], seq 1549504260, ack 3248016137, win 5840, options [mss 1460,nop,wscale 9], length 0
22:10:07.078232 IP 31.187.66.246.1212 > 37.123.99.15.50090: Flags [S.], seq 2744297289, ack 2328128370, win 5792, options [mss 1460,sackOK,TS val 2739865516 ecr 1167371006,nop,wscale 9], length 0
22:10:07.078686 IP 185.118.142.10.53382 > 46.164.128.62.3389: Flags [S], seq 1089026771, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.083138 IP 74.125.200.26.25 > 213.238.166.79.50003: Flags [S.], seq 285023667, ack 4113304395, win 42408, options [mss 1380,sackOK,TS val 1429963177 ecr 821225226,nop,wscale 7], length 0
22:10:07.084416 IP 114.142.150.131.80 > 213.238.171.194.34912: Flags [S.], seq 3918590107, ack 4189166533, win 16384, options [mss 1460,nop,wscale 0,nop,nop,TS val 0 ecr 0,nop,nop,sackOK], length 0
22:10:07.084797 IP 185.118.142.125.12999 > 112.122.237.35.22: Flags [S], seq 4267847679, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 624271037 ecr 0], length 0
22:10:07.086144 IP 208.180.40.132.25 > 178.20.226.19.38151: Flags [S.], seq 2655329546, ack 2485388628, win 4380, options [mss 1460,nop,nop,TS val 1278669191 ecr 2167567286,sackOK,eol], length 0
22:10:07.088286 IP 185.118.142.9.28079 > 186.105.74.63.22: Flags [S], seq 2090494914, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 62789951 ecr 0], length 0
22:10:07.092183 IP 213.238.171.194.52673 > 104.27.174.195.80: Flags [S], seq 1343019485, win 14600, options [mss 1460,sackOK,TS val 3329676706 ecr 0,nop,wscale 7], length 0
22:10:07.092284 IP 220.132.7.41.61919 > 185.90.81.200.23: Flags [S], seq 3109704136, win 45172, length 0
22:10:07.097713 IP 222.252.14.170.7698 > 213.238.170.109.23: Flags [S], seq 26142, win 14600, length 0
22:10:07.106657 IP 128.65.196.35.22 > 178.20.228.130.37752: Flags [S.], seq 3722271856, ack 2440992154, win 14480, options [mss 1460,sackOK,TS val 2788960236 ecr 274083280,nop,wscale 7], length 0
22:10:07.108213 IP 185.118.142.124.80 > 78.188.155.132.26393: Flags [S.], seq 3249123188, ack 2877572672, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
22:10:07.113986 IP 185.118.143.184.61793 > 195.211.221.116.80: Flags [S], seq 2381684426, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:10:07.123428 IP 173.240.112.75.50129 > 213.238.170.30.80: Flags [S], seq 274232196, win 65535, options [mss 1460,nop,wscale 5,nop,nop,TS val 351114079 ecr 0,sackOK,eol], length 0
22:10:07.126699 IP 94.102.9.97.3389 > 37.123.99.57.52801: Flags [S.], seq 3073691605, ack 93046053, win 64000, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0
22:10:07.128418 IP 213.238.172.130.3756 > 82.94.210.34.25: Flags [S], seq 3541792627, win 65535, options [mss 1460,nop,nop,sackOK], length 0
22:10:07.129283 IP 213.238.166.76.59509 > 216.82.242.36.25: Flags [S], seq 385646225, win 14600, options [mss 1460,sackOK,TS val 821225937 ecr 0,nop,wscale 7], length 0
22:10:07.130022 IP 64.233.184.26.25 > 213.238.166.76.57086: Flags [S.], seq 4135378003, ack 2141943155, win 42408, options [mss 1380,sackOK,TS val 1280654113 ecr 821225869,nop,wscale 7], length 0
22:10:07.135859 IP 104.27.174.195.80 > 213.238.171.194.52674: Flags [S.], seq 3208172504, ack 3052400146, win 29200, options [mss 1460,nop,nop,sackOK,nop,wscale 10], length 0