Packets marked INVALID in FORWARD rule Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern) Come Celebrate our 10 Year Anniversary!iptables port forward forwardingFsockOpen problem with Iptables inside OpenVZ VMFirewall still blocking port 53 despite listing otherwise?Use MikroTik Bridge as a Public IP Firewall for Public Hosted ServersTrying to make iptables stateless is causing unforeseen filteringIptables port forwarding for specific host dd-wrt/tomatoProblems with multicasts in “iptables”iptables mysterious DROP --sport 80 [ACK FIN]RHEL 6 Having issues forwarding port 80 to port 8080debian kvm server with iptables is dropping bridge packets
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Packets marked INVALID in FORWARD rule
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)
Come Celebrate our 10 Year Anniversary!iptables port forward forwardingFsockOpen problem with Iptables inside OpenVZ VMFirewall still blocking port 53 despite listing otherwise?Use MikroTik Bridge as a Public IP Firewall for Public Hosted ServersTrying to make iptables stateless is causing unforeseen filteringIptables port forwarding for specific host dd-wrt/tomatoProblems with multicasts in “iptables”iptables mysterious DROP --sport 80 [ACK FIN]RHEL 6 Having issues forwarding port 80 to port 8080debian kvm server with iptables is dropping bridge packets
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I have a firewall that has 3 IP aliases on 1 physical interface. Packets get dropped between these 3 interfaces (either ICMP, HTTP, or anything else). We tracked it down to these packets being marked INVALID in the FORWARD rule and dropped due to the this rule:
chain FORWARD
policy DROP;
# connection tracking
mod state state INVALID LOG log-prefix 'INVALID FORWARD DROP: ';
mod state state INVALID DROP;
mod state state (ESTABLISHED RELATED) ACCEPT;
(That is, we see the INVALID FORWARD DROP logs in dmesg)
What could be causing this?
iptables firewall routing
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
add a comment |
I have a firewall that has 3 IP aliases on 1 physical interface. Packets get dropped between these 3 interfaces (either ICMP, HTTP, or anything else). We tracked it down to these packets being marked INVALID in the FORWARD rule and dropped due to the this rule:
chain FORWARD
policy DROP;
# connection tracking
mod state state INVALID LOG log-prefix 'INVALID FORWARD DROP: ';
mod state state INVALID DROP;
mod state state (ESTABLISHED RELATED) ACCEPT;
(That is, we see the INVALID FORWARD DROP logs in dmesg)
What could be causing this?
iptables firewall routing
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
add a comment |
I have a firewall that has 3 IP aliases on 1 physical interface. Packets get dropped between these 3 interfaces (either ICMP, HTTP, or anything else). We tracked it down to these packets being marked INVALID in the FORWARD rule and dropped due to the this rule:
chain FORWARD
policy DROP;
# connection tracking
mod state state INVALID LOG log-prefix 'INVALID FORWARD DROP: ';
mod state state INVALID DROP;
mod state state (ESTABLISHED RELATED) ACCEPT;
(That is, we see the INVALID FORWARD DROP logs in dmesg)
What could be causing this?
iptables firewall routing
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
I have a firewall that has 3 IP aliases on 1 physical interface. Packets get dropped between these 3 interfaces (either ICMP, HTTP, or anything else). We tracked it down to these packets being marked INVALID in the FORWARD rule and dropped due to the this rule:
chain FORWARD
policy DROP;
# connection tracking
mod state state INVALID LOG log-prefix 'INVALID FORWARD DROP: ';
mod state state INVALID DROP;
mod state state (ESTABLISHED RELATED) ACCEPT;
(That is, we see the INVALID FORWARD DROP logs in dmesg)
What could be causing this?
iptables firewall routing
iptables firewall routing
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
asked Oct 19 '12 at 10:25
ℝaphinkℝaphink
8,42723042
8,42723042
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
The INVALID state means that the packet is not associated with a known connection (and isn't starting a new connection either). The only reasons I can think of is that something is clearing the connection tracking table, the table is overflowing, or the entries are timing out too quickly. You can check the size of the connection tracking table with sudo conntrack -L | wc -l and the maximum number of entries with cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max.
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
The conntrack is not full. Which parameter could cause a timeout?
– ℝaphink
Oct 25 '12 at 7:22
@ℝaphink There are numerous timeout parameters for different situations, have a look in/proc/sys/net/ipv4/netfilter/.ip_conntrack_generic_timeoutis probably the most important one.
– mgorven
Oct 25 '12 at 16:42
add a comment |
Use macvlan in bridge mode instead of IP aliases and keep the physical interface in promisc mode.
e.g.
- eno1 is the interface you want to use.
- Then create macvlan1@eno1, macvlan2@eno1 and macvlan3@eno1.
- Keep eno1 in promisc mode.
Refer below sequence for creating a macvlan interface.
# /sbin/ip link add link eno1 macvlan1 type macvlan mode bridge
# /sbin/ip addr add 192.168.1.1/24 dev macvlan1
# /sbin/ip link set macvlan1 address aa:bb:bb:dd:ee:ff up
Refer below command to make promisc mode on for eno2
# /sbin/ip link set eno1 promisc on
answered Jul 13 '17 at 10:35
EleissEleiss
11
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The INVALID state means that the packet is not associated with a known connection (and isn't starting a new connection either). The only reasons I can think of is that something is clearing the connection tracking table, the table is overflowing, or the entries are timing out too quickly. You can check the size of the connection tracking table with sudo conntrack -L | wc -l and the maximum number of entries with cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max.
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
The conntrack is not full. Which parameter could cause a timeout?
– ℝaphink
Oct 25 '12 at 7:22
@ℝaphink There are numerous timeout parameters for different situations, have a look in/proc/sys/net/ipv4/netfilter/.ip_conntrack_generic_timeoutis probably the most important one.
– mgorven
Oct 25 '12 at 16:42
add a comment |
The INVALID state means that the packet is not associated with a known connection (and isn't starting a new connection either). The only reasons I can think of is that something is clearing the connection tracking table, the table is overflowing, or the entries are timing out too quickly. You can check the size of the connection tracking table with sudo conntrack -L | wc -l and the maximum number of entries with cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max.
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
The conntrack is not full. Which parameter could cause a timeout?
– ℝaphink
Oct 25 '12 at 7:22
@ℝaphink There are numerous timeout parameters for different situations, have a look in/proc/sys/net/ipv4/netfilter/.ip_conntrack_generic_timeoutis probably the most important one.
– mgorven
Oct 25 '12 at 16:42
add a comment |
The INVALID state means that the packet is not associated with a known connection (and isn't starting a new connection either). The only reasons I can think of is that something is clearing the connection tracking table, the table is overflowing, or the entries are timing out too quickly. You can check the size of the connection tracking table with sudo conntrack -L | wc -l and the maximum number of entries with cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max.
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
The INVALID state means that the packet is not associated with a known connection (and isn't starting a new connection either). The only reasons I can think of is that something is clearing the connection tracking table, the table is overflowing, or the entries are timing out too quickly. You can check the size of the connection tracking table with sudo conntrack -L | wc -l and the maximum number of entries with cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max.
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
answered Oct 25 '12 at 1:08
mgorvenmgorven
26.4k755108
26.4k755108
The conntrack is not full. Which parameter could cause a timeout?
– ℝaphink
Oct 25 '12 at 7:22
@ℝaphink There are numerous timeout parameters for different situations, have a look in/proc/sys/net/ipv4/netfilter/.ip_conntrack_generic_timeoutis probably the most important one.
– mgorven
Oct 25 '12 at 16:42
add a comment |
The conntrack is not full. Which parameter could cause a timeout?
– ℝaphink
Oct 25 '12 at 7:22
@ℝaphink There are numerous timeout parameters for different situations, have a look in/proc/sys/net/ipv4/netfilter/.ip_conntrack_generic_timeoutis probably the most important one.
– mgorven
Oct 25 '12 at 16:42
The conntrack is not full. Which parameter could cause a timeout?
– ℝaphink
Oct 25 '12 at 7:22
The conntrack is not full. Which parameter could cause a timeout?
– ℝaphink
Oct 25 '12 at 7:22
@ℝaphink There are numerous timeout parameters for different situations, have a look in
/proc/sys/net/ipv4/netfilter/. ip_conntrack_generic_timeout is probably the most important one.– mgorven
Oct 25 '12 at 16:42
@ℝaphink There are numerous timeout parameters for different situations, have a look in
/proc/sys/net/ipv4/netfilter/. ip_conntrack_generic_timeout is probably the most important one.– mgorven
Oct 25 '12 at 16:42
add a comment |
Use macvlan in bridge mode instead of IP aliases and keep the physical interface in promisc mode.
e.g.
- eno1 is the interface you want to use.
- Then create macvlan1@eno1, macvlan2@eno1 and macvlan3@eno1.
- Keep eno1 in promisc mode.
Refer below sequence for creating a macvlan interface.
# /sbin/ip link add link eno1 macvlan1 type macvlan mode bridge
# /sbin/ip addr add 192.168.1.1/24 dev macvlan1
# /sbin/ip link set macvlan1 address aa:bb:bb:dd:ee:ff up
Refer below command to make promisc mode on for eno2
# /sbin/ip link set eno1 promisc on
answered Jul 13 '17 at 10:35
EleissEleiss
11
add a comment |
Use macvlan in bridge mode instead of IP aliases and keep the physical interface in promisc mode.
e.g.
- eno1 is the interface you want to use.
- Then create macvlan1@eno1, macvlan2@eno1 and macvlan3@eno1.
- Keep eno1 in promisc mode.
Refer below sequence for creating a macvlan interface.
# /sbin/ip link add link eno1 macvlan1 type macvlan mode bridge
# /sbin/ip addr add 192.168.1.1/24 dev macvlan1
# /sbin/ip link set macvlan1 address aa:bb:bb:dd:ee:ff up
Refer below command to make promisc mode on for eno2
# /sbin/ip link set eno1 promisc on
answered Jul 13 '17 at 10:35
EleissEleiss
11
add a comment |
Use macvlan in bridge mode instead of IP aliases and keep the physical interface in promisc mode.
e.g.
- eno1 is the interface you want to use.
- Then create macvlan1@eno1, macvlan2@eno1 and macvlan3@eno1.
- Keep eno1 in promisc mode.
Refer below sequence for creating a macvlan interface.
# /sbin/ip link add link eno1 macvlan1 type macvlan mode bridge
# /sbin/ip addr add 192.168.1.1/24 dev macvlan1
# /sbin/ip link set macvlan1 address aa:bb:bb:dd:ee:ff up
Refer below command to make promisc mode on for eno2
# /sbin/ip link set eno1 promisc on
answered Jul 13 '17 at 10:35
EleissEleiss
11
Use macvlan in bridge mode instead of IP aliases and keep the physical interface in promisc mode.
e.g.
- eno1 is the interface you want to use.
- Then create macvlan1@eno1, macvlan2@eno1 and macvlan3@eno1.
- Keep eno1 in promisc mode.
Refer below sequence for creating a macvlan interface.
# /sbin/ip link add link eno1 macvlan1 type macvlan mode bridge
# /sbin/ip addr add 192.168.1.1/24 dev macvlan1
# /sbin/ip link set macvlan1 address aa:bb:bb:dd:ee:ff up
Refer below command to make promisc mode on for eno2
# /sbin/ip link set eno1 promisc on
answered Jul 13 '17 at 10:35
EleissEleiss
11
answered Jul 13 '17 at 10:35
EleissEleiss
11
answered Jul 13 '17 at 10:35
EleissEleiss
11
answered Jul 13 '17 at 10:35
EleissEleiss
11
11
add a comment |
add a comment |
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