Ïîòåðè ïàêåòîâ

[spions]

Áüþñü óæå 3 äåíü íèêàê íå ìîãó ïîíÿòü â ÷åì äåëî. Èñõîäíûå äàííûå WL500gp-1.9.2.7-rtn-r3300.

Åñòü 2 ñåðâåðà, êîòîðûå ñèíõðîíèçèðóþòñÿ ñ Rsync ñåðâåðîì, êîòîðûé íàõîäèòñÿ çà WL500gp.
iptables -t nat -A PREROUTING -p tcp --dport 873 -j DNAT --to-destination 192.168.1.11:873

Ïåðâûé ñåðâåð â Ðîññèè, âòîðîé â Ãåðìàíèè.
Ïåðâûé ñåðâåð ïîëíîñòüþ íîðìàëüíî ðàáîòàåò ñ Rsync è ñî âñåì îñòàëüíûì îáîðóäîâàíèåì çà WL500gp.
Âòîðîé ñåðâåð íå ìîæåò îòäàòü Rsync èëè ëþáîé äðóãîé ñëóæáå çà ðîóòåðîì ôàéë áîëüøå 1500b, ïðè
ðàáîòå ñ ñàìèì WL500gp ïðîáëåì íåò. ò.å. ôàéë áîëüøå 1500b. íà ðîóòåð çàëèâàåòñÿ áåç ïðîáëåì.
Ïðè ïîñûëêå ñî âòîðîãî ñåîâåðà ôàéëîâ ìåíüøå 1500b. íà Rsync ïðîáëåìà òàêæå íå ïðîÿâëÿåòñÿ.

Ïðîáîâàë ìåíÿòü ïðîøèâêó, îòêëþ÷àòü ôàéðâîëû, ðàçðåøàòü âñå. Ïèíãè áîëüøå 1500 õîäÿò çàìå÷àòåëüíî.
 ÷åì ìîæåò áûòü äåëî? Ïî ïîñëåäåìó tcpdump âèäíî ÷òî ïàêåòû ñ 1.11.873 ïî÷åìó-òî íå óïàêîâûâàåòñÿ â l2tp.

Tcpdump ñ ñåðâåðà èñòî÷íèêà

17:52:58.965177 IP 87.118.126.248.38095 > 95.28.135.144.873: S 1397196183:1397196183(0) win 5840 <mss 1460,sackOK,timestamp 1486617360 0>
17:52:59.036457 IP 95.28.135.144.873 > 87.118.126.248.38095: S 1379525776:1379525776(0) ack 1397196184 win 5792 <mss 1460,sackOK,timestamp 19314187 1486617360>
17:52:59.036478 IP 87.118.126.248.38095 > 95.28.135.144.873: . ack 1 win 5840 <nop,nop,timestamp 1486617432 19314187>
17:52:59.036531 IP 87.118.126.248.38095 > 95.28.135.144.873: P 1:15(14) ack 1 win 5840 <nop,nop,timestamp 1486617432 19314187>
17:52:59.110183 IP 95.28.135.144.873 > 87.118.126.248.38095: . ack 15 win 5792 <nop,nop,timestamp 19314195 1486617432>
....
17:52:59.763510 IP 87.118.126.248.38095 > 95.28.135.144.873: . 1630:3078(1448) ack 112 win 5840 <nop,nop,timestamp 1486618159 19314260>
17:53:00.028402 IP 95.28.135.144.873 > 87.118.126.248.38095: P 72:112(40) ack 182 win 5792 <nop,nop,timestamp 19314287 1486618082>
17:53:00.028424 IP 87.118.126.248.38095 > 95.28.135.144.873: . ack 112 win 5840 <nop,nop,timestamp 1486618423 19314287,nop,nop,sack 1 {72:112}>

 ýòîì ìåñòå Rsync êëèåíò çàìèðàåò.

17:53:00.038391 IP 87.118.126.248.38095 > 95.28.135.144.873: . 182:1630(1448) ack 112 win 5840 <nop,nop,timestamp 1486618433 19314287>
17:53:00.585389 IP 87.118.126.248.38095 > 95.28.135.144.873: . 182:1630(1448) ack 112 win 5840 <nop,nop,timestamp 1486618981 19314287>
17:53:01.681385 IP 87.118.126.248.38095 > 95.28.135.144.873: . 182:1630(1448) ack 112 win 5840 <nop,nop,timestamp 1486620077 19314287>
17:53:03.873394 IP 87.118.126.248.38095 > 95.28.135.144.873: . 182:1630(1448) ack 112 win 5840 <nop,nop,timestamp 1486622269 19314287>

Tcpdump íà ðîóòåðå

listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
20:05:59.415788 IP 85.21.0.156.1701 > 10.193.97.192.1701:  l2tp:[O](14831/44663) {IP 87.118.126.248.38095 > 95.28.135.144.873: Flags [S], seq 1397196183, win 5840, options [mss 1460,sackOK,TS val 1486617360 ecr 0], length 0}
20:05:59.416248 IP 87.118.126.248.38095 > 192.168.1.11.873: Flags [S], seq 1397196183, win 5840, options [mss 1420,sackOK,TS val 1486617360 ecr 0], length 0
20:05:59.416459 IP 192.168.1.11.873 > 87.118.126.248.38095: Flags [S.], seq 1379525776, ack 1397196184, win 5792, options [mss 1460,sackOK,TS val 19314187 ecr 1486617360], length 0
20:05:59.416787 IP 10.193.97.192.1701 > 85.21.0.156.1701:  l2tp:[](28776/36339) {IP 95.28.135.144.873 > 87.118.126.248.38095: Flags [S.], seq 1379525776, ack 1397196184, win 5792, options [mss 1460,sackOK,TS val 19314187 ecr 1486617360], length 0}
....
20:06:00.066370 IP 192.168.1.11.873 > 87.118.126.248.38095: Flags [.], ack 114, win 5792, options [nop,nop,TS val 19314252 ecr 1486618012], length 0
20:06:00.066668 IP 10.193.97.192.1701 > 85.21.0.156.1701:  l2tp:[](28776/36339) {IP 95.28.135.144.873 > 87.118.126.248.38095: Flags [.], ack 114, win 5792, options [nop,nop,TS val 19314252 ecr 1486618012], length 0}

20:06:00.067119 IP 192.168.1.11.873 > 87.118.126.248.38095: Flags [P.], seq 68:72, ack 114, win 5792, options [nop,nop,TS val 19314252 ecr 1486618012], length 4
20:06:00.067331 IP 10.193.97.192.1701 > 85.21.0.156.1701:  l2tp:[](28776/36339) {IP 95.28.135.144.873 > 87.118.126.248.38095: Flags [P.], seq 68:72, ack 114, win 5792, options [nop,nop,TS val 19314252 ecr 1486618012], length 4}

20:06:00.136348 IP 85.21.0.156.1701 > 10.193.97.192.1701:  l2tp:[O](14831/44663) {IP 87.118.126.248.38095 > 95.28.135.144.873: Flags [P.], seq 114:182, ack 72, win 5840, options [nop,nop,TS val 1486618082 ecr 19314252], length 68}
20:06:00.136609 IP 87.118.126.248.38095 > 192.168.1.11.873: Flags [P.], seq 114:182, ack 72, win 5840, options [nop,nop,TS val 1486618082 ecr 19314252], length 68

20:06:00.139376 IP 192.168.1.11.873 > 87.118.126.248.38095: Flags [P.], seq 72:112, ack 182, win 5792, options [nop,nop,TS val 19314260 ecr 1486618082], length 40
20:06:00.139671 IP 10.193.97.192.1701 > 85.21.0.156.1701:  l2tp:[](28776/36339) {IP 95.28.135.144.873 > 87.118.126.248.38095: Flags [P.], seq 72:112, ack 182, win 5792, options [nop,nop,TS val 19314260 ecr 1486618082], length 40}

20:06:00.408627 IP 192.168.1.11.873 > 87.118.126.248.38095: Flags [P.], seq 72:112, ack 182, win 5792, options [nop,nop,TS val 19314287 ecr 1486618082], length 40

UPD Îòêàòèëñÿ íà 1.9.2.7-d-r2624 ïðîáëåìà ðåøèëàñü.