Hi,I've a server in OVH datacenter, on this server i've 7 VMs, on 1 of them in run Apache. To debug a slow upload (who was ~2Mo/s instead 12Mo/s) i've installed an HTML5/PHP speed test application. When i use this app, i've no problem in general, but, when a make a speed test from a source who have more bandwith than the server (the server is limited at 100Mb/s by OVH and i make the test from a 4G+ network where i've ~150Mb/s of bandwith), in this case, the DOM0 lost his network connection (like the ethernet cable is unplugged) until i reboot the server.
When i check the syslog of DOM0, i see that iptables drop incomming packet on port 80 instead of routing them to the VM.
This is my iptables script i use on DOM0 : #!/bin/bash IPT="/sbin/iptables" ########################################################################################### # Filter ## Remise par defaut des regles $IPT -t filter -P INPUT ACCEPT $IPT -t filter -P FORWARD ACCEPT $IPT -t filter -P OUTPUT ACCEPT ## On purge les tables $IPT -t filter -F ## On autorise lo $IPT -t filter -A INPUT -i lo -j ACCEPT ## On ouvre les ports nécéssaires au DOM0$IPT -t filter -A INPUT -m tcp -p tcp --dport 22 -j ACCEPT ## SSH $IPT -t filter -A INPUT -m udp -p udp --dport 53 -j ACCEPT ## DNS $IPT -t filter -A INPUT -m icmp -p icmp --icmp-type 8 -j ACCEPT ## Ping
$IPT -t filter -A INPUT -s 10.0.0.0/24 -j ACCEPT ## On accepte si la connexion est déjà établie $IPT -t filter -A INPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT ## On log ce qui n'a pas été matché par les règles précédente $IPT -A INPUT -p tcp -j LOG --log-prefix "DROPED packets " ## On bloque tout le reste $IPT -t filter -P INPUT DROP ############################################################################################ # Nat ## Remise par defaut des regles $IPT -t nat -P PREROUTING ACCEPT $IPT -t nat -P POSTROUTING ACCEPT $IPT -t nat -P INPUT ACCEPT $IPT -t nat -P OUTPUT ACCEPT ## On purge $IPT -t nat -F ### Routage des ports entrants pour la VM "mails"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22030 -j DNAT --to 10.0.0.30:22 ## SSH $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 25 -j DNAT --to 10.0.0.30:25 ## SMTP $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 587 -j DNAT --to 10.0.0.30:587 ## SMTP SUBMISSION $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 465 -j DNAT --to 10.0.0.30:465 ## SMTP SSL $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 143 -j DNAT --to 10.0.0.30:143 ## IMAP $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 993 -j DNAT --to 10.0.0.30:993 ## IMAP SSL $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 9930 -j DNAT --to 10.0.0.30:9930 ## IMAP SSL
### Routage des ports entrants pour la VM "sql"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22020 -j DNAT --to 10.0.0.20:22 ## SSH $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 3306 -j DNAT --to 10.0.0.20:3306 ## MariaDB
### Routage des ports entrants pour la VM "files"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22010 -j DNAT --to 10.0.0.10:22 ## SSH
### Routage des ports entrant pour la VM "web"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22040 -j DNAT --to 10.0.0.40:22 ## SSH $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 80 -j DNAT --to 10.0.0.40:80 ## HTTP $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 443 -j DNAT --to 10.0.0.40:443 ## HTTPS
### Routage des ports entrants pour la VM "monitor"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22050 -j DNAT --to 10.0.0.50:22 ## SSH $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 850 -j DNAT --to 10.0.0.50:80 ## HTTP $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 855 -j DNAT --to 10.0.0.50:443 ## HTTPS
### Routage des ports entrants pour la VM "comm"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22060 -j DNAT --to 10.0.0.60:22 ## SSH $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 5222 -j DNAT --to 10.0.0.60:5222 ## Jabber $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 5269 -j DNAT --to 10.0.0.60:5269 ## Jabber $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 5280 -j DNAT --to 10.0.0.60:5280 ## Jabber $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 5281 -j DNAT --to 10.0.0.60:5281 ## Jabber
### Routage des ports entrants pour la VM "secure"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22070 -j DNAT --to 10.0.0.70:22 ## SSH
### Routage des ports entrants pour la VM "net"$IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 22080 -j DNAT --to 10.0.0.80:22 ## SSH $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 8388 -j DNAT --to 10.0.0.80:8388 ## shadowsocks $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p udp --dport 8388 -j DNAT --to 10.0.0.80:8388 ## shadowsocks $IPT -t nat -A PREROUTING -d XX.XX.XX.XX -p tcp --dport 11094 -j DNAT --to 10.0.0.80:1194 ## OpenVPN
### Autorise les VMs a accéder a internet $IPT -t nat -A POSTROUTING -s 10.0.0.0/24 -j MASQUERADE And this is what i have in syslogs :Aug 28 15:50:32 ovh-1 kernel: DROPED packets IN=enp1s0 OUT= MAC=ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ SRC=YY.YY.YY.YY DST=XX.XX.XX.XX LEN=40 TOS=0x00 PREC=0x00 TTL=55 ID=2226 DF PROTO=TCP SPT=9610 DPT=80 WINDOW=0 RES=0x00 RST URGP=0 Aug 28 15:50:32 ovh-1 kernel: DROPED packets IN=enp1s0 OUT= MAC=ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ SRC=YY.YY.YY.YY DST=XX.XX.XX.XX LEN=40 TOS=0x00 PREC=0x00 TTL=55 ID=2227 DF PROTO=TCP SPT=9610 DPT=80 WINDOW=0 RES=0x00 RST URGP=0 Aug 28 15:50:32 ovh-1 kernel: DROPED packets IN=enp1s0 OUT= MAC=ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ SRC=YY.YY.YY.YY DST=XX.XX.XX.XX LEN=40 TOS=0x00 PREC=0x00 TTL=55 ID=2228 DF PROTO=TCP SPT=9610 DPT=80 WINDOW=0 RES=0x00 RST URGP=0 Aug 28 15:50:32 ovh-1 kernel: DROPED packets IN=enp1s0 OUT= MAC=ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ SRC=YY.YY.YY.YY DST=XX.XX.XX.XX LEN=40 TOS=0x00 PREC=0x00 TTL=55 ID=2229 DF PROTO=TCP SPT=9610 DPT=80 WINDOW=0 RES=0x00 RST URGP=0
*** I've several hundred of similare line where only the ID change, then : ***
Aug 28 15:50:32 ovh-1 kernel: e1000e: enp1s0 NIC Link is Down Aug 28 15:50:32 ovh-1 systemd-networkd[20998]: enp1s0: Lost carrier Aug 28 15:50:34 ovh-1 systemd-networkd[20998]: enp1s0: Gained carrierAug 28 15:50:34 ovh-1 kernel: e1000e: enp1s0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None Aug 28 15:50:34 ovh-1 kernel: e1000e 0000:01:00.0 enp1s0: 10/100 speed: disabling TSO
The log show that the network is UP but the server is offline. In the VM's logs i don't have abnormal things.OVH have changed the motherboard and the ethernet cable but the problem still persist, the syslog show that it's probably a software problem.
Do you have idea of what happen or a way to help me to debug this problem? Thank you in advance. Kevin -- DAGNEAUX Kevin Service informatique 03 29 36 88 85 kevin.dagne...@fiitelcom.fr
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