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How to Enable IPtables TRACE Target on Debian Squeeze (6)
Debugger for Iptablesiptables logging not working?Iptables QUEUE Target and Snortiptables - Target to route packet to specific interface?packets sent on virtual IP don't hit iptables ruleLog all forwarded traffic to new server with iptablesIptables : forwarding SSH traffic according destination IPRedirecting log from /var/log/kern.log to a separate log file for iptables logiptables TRACE No chain/target/match by that nameiptables traversal when connecting to docker clientDNAT using iptables only works for traffic incoming on eth0
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I am trying to use the TRACE target of IPtables but I can't seem to get any trace information logged. I want to use what is described here:
Debugger for Iptables.
From the iptables man for TRACE:
This target marks packes so that the kernel will log every rule which
match the packets as those traverse the tables, chains, rules. (The
ipt_LOG or ip6t_LOG module is required for the logging.) The packets
are logged with the string prefix: "TRACE: tablename:chain-
name:type:rulenum " where type can be "rule" for plain rule, "return"
for implicit rule at the end of a user defined chain and "policy" for
the policy of the built in chains.
It can only be used in the raw table.
I use the following rule: iptables -A PREROUTING -t raw -p tcp -j TRACE but nothing is appended either in /var/log/syslog or /var/log/kern.log!
Is there another step missing? Am I looking in the wrong place?
edit
Even though I can't find log entries, the TRACE target seems to be set up correctly since the packet counters get incremented:
# iptables -L -v -t raw
Chain PREROUTING (policy ACCEPT 193 packets, 63701 bytes)
pkts bytes target prot opt in out source destination
193 63701 TRACE tcp -- any any anywhere anywhere
Chain OUTPUT (policy ACCEPT 178 packets, 65277 bytes)
pkts bytes target prot opt in out source destination
edit 2
The rule iptables -A PREROUTING -t raw -p tcp -j LOG does print packet information to /var/log/syslog... Why doesn't TRACE work?
linux debian iptables logging log-files
edited Apr 13 '17 at 12:14
Community♦
1
asked May 4 '12 at 4:37
berniebernie
2151311
add a comment |
I am trying to use the TRACE target of IPtables but I can't seem to get any trace information logged. I want to use what is described here:
Debugger for Iptables.
From the iptables man for TRACE:
This target marks packes so that the kernel will log every rule which
match the packets as those traverse the tables, chains, rules. (The
ipt_LOG or ip6t_LOG module is required for the logging.) The packets
are logged with the string prefix: "TRACE: tablename:chain-
name:type:rulenum " where type can be "rule" for plain rule, "return"
for implicit rule at the end of a user defined chain and "policy" for
the policy of the built in chains.
It can only be used in the raw table.
I use the following rule: iptables -A PREROUTING -t raw -p tcp -j TRACE but nothing is appended either in /var/log/syslog or /var/log/kern.log!
Is there another step missing? Am I looking in the wrong place?
edit
Even though I can't find log entries, the TRACE target seems to be set up correctly since the packet counters get incremented:
# iptables -L -v -t raw
Chain PREROUTING (policy ACCEPT 193 packets, 63701 bytes)
pkts bytes target prot opt in out source destination
193 63701 TRACE tcp -- any any anywhere anywhere
Chain OUTPUT (policy ACCEPT 178 packets, 65277 bytes)
pkts bytes target prot opt in out source destination
edit 2
The rule iptables -A PREROUTING -t raw -p tcp -j LOG does print packet information to /var/log/syslog... Why doesn't TRACE work?
linux debian iptables logging log-files
edited Apr 13 '17 at 12:14
Community♦
1
asked May 4 '12 at 4:37
berniebernie
2151311
1
just stumpled upon a python program (which is also called iptables-trace :). When started it adds a TRACE rule with specified conditions into running iptables, parses and display formatted output for resulting TRACE output until the program is stopped (which removes the TRACE rule from iptables). Will try this soon...
– chris
May 31 '16 at 19:31
add a comment |
I am trying to use the TRACE target of IPtables but I can't seem to get any trace information logged. I want to use what is described here:
Debugger for Iptables.
From the iptables man for TRACE:
This target marks packes so that the kernel will log every rule which
match the packets as those traverse the tables, chains, rules. (The
ipt_LOG or ip6t_LOG module is required for the logging.) The packets
are logged with the string prefix: "TRACE: tablename:chain-
name:type:rulenum " where type can be "rule" for plain rule, "return"
for implicit rule at the end of a user defined chain and "policy" for
the policy of the built in chains.
It can only be used in the raw table.
I use the following rule: iptables -A PREROUTING -t raw -p tcp -j TRACE but nothing is appended either in /var/log/syslog or /var/log/kern.log!
Is there another step missing? Am I looking in the wrong place?
edit
Even though I can't find log entries, the TRACE target seems to be set up correctly since the packet counters get incremented:
# iptables -L -v -t raw
Chain PREROUTING (policy ACCEPT 193 packets, 63701 bytes)
pkts bytes target prot opt in out source destination
193 63701 TRACE tcp -- any any anywhere anywhere
Chain OUTPUT (policy ACCEPT 178 packets, 65277 bytes)
pkts bytes target prot opt in out source destination
edit 2
The rule iptables -A PREROUTING -t raw -p tcp -j LOG does print packet information to /var/log/syslog... Why doesn't TRACE work?
linux debian iptables logging log-files
edited Apr 13 '17 at 12:14
Community♦
1
asked May 4 '12 at 4:37
berniebernie
2151311
I am trying to use the TRACE target of IPtables but I can't seem to get any trace information logged. I want to use what is described here:
Debugger for Iptables.
From the iptables man for TRACE:
This target marks packes so that the kernel will log every rule which
match the packets as those traverse the tables, chains, rules. (The
ipt_LOG or ip6t_LOG module is required for the logging.) The packets
are logged with the string prefix: "TRACE: tablename:chain-
name:type:rulenum " where type can be "rule" for plain rule, "return"
for implicit rule at the end of a user defined chain and "policy" for
the policy of the built in chains.
It can only be used in the raw table.
I use the following rule: iptables -A PREROUTING -t raw -p tcp -j TRACE but nothing is appended either in /var/log/syslog or /var/log/kern.log!
Is there another step missing? Am I looking in the wrong place?
edit
Even though I can't find log entries, the TRACE target seems to be set up correctly since the packet counters get incremented:
# iptables -L -v -t raw
Chain PREROUTING (policy ACCEPT 193 packets, 63701 bytes)
pkts bytes target prot opt in out source destination
193 63701 TRACE tcp -- any any anywhere anywhere
Chain OUTPUT (policy ACCEPT 178 packets, 65277 bytes)
pkts bytes target prot opt in out source destination
edit 2
The rule iptables -A PREROUTING -t raw -p tcp -j LOG does print packet information to /var/log/syslog... Why doesn't TRACE work?
linux debian iptables logging log-files
linux debian iptables logging log-files
edited Apr 13 '17 at 12:14
Community♦
1
asked May 4 '12 at 4:37
berniebernie
2151311
edited Apr 13 '17 at 12:14
Community♦
1
asked May 4 '12 at 4:37
berniebernie
2151311
edited Apr 13 '17 at 12:14
Community♦
1
edited Apr 13 '17 at 12:14
Community♦
1
edited Apr 13 '17 at 12:14
Community♦
1
1
asked May 4 '12 at 4:37
berniebernie
2151311
asked May 4 '12 at 4:37
berniebernie
2151311
asked May 4 '12 at 4:37
berniebernie
2151311
2151311
1
just stumpled upon a python program (which is also called iptables-trace :). When started it adds a TRACE rule with specified conditions into running iptables, parses and display formatted output for resulting TRACE output until the program is stopped (which removes the TRACE rule from iptables). Will try this soon...
– chris
May 31 '16 at 19:31
add a comment |
1
just stumpled upon a python program (which is also called iptables-trace :). When started it adds a TRACE rule with specified conditions into running iptables, parses and display formatted output for resulting TRACE output until the program is stopped (which removes the TRACE rule from iptables). Will try this soon...
– chris
May 31 '16 at 19:31
1
1
just stumpled upon a python program (which is also called iptables-trace :). When started it adds a TRACE rule with specified conditions into running iptables, parses and display formatted output for resulting TRACE output until the program is stopped (which removes the TRACE rule from iptables). Will try this soon...
– chris
May 31 '16 at 19:31
just stumpled upon a python program (which is also called iptables-trace :). When started it adds a TRACE rule with specified conditions into running iptables, parses and display formatted output for resulting TRACE output until the program is stopped (which removes the TRACE rule from iptables). Will try this soon...
– chris
May 31 '16 at 19:31
add a comment |
4 Answers
4
active
oldest
votes
Run:
modprobe ipt_LOG
That fixed it for me.
edited May 21 at 23:13
bain
17515
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
Thanks, that worked! The logs are available in /var/log/syslog or /var/log/kern.log
– bernie
Sep 24 '12 at 18:55
add a comment |
Seems like (i.e. works for me) with new kernel this is needed (for IPv4):
modprobe nf_log_ipv4
sysctl net.netfilter.nf_log.2=nf_log_ipv4
credits:
- https://www.centos.org/forums/viewtopic.php?f=47&t=54411
- upvoting other answers as they gave me important hints
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
This was the one that worked for me on Ubuntu 16.04 (kernel 4.4.0-21-generic)
– Ash Berlin-Taylor
Mar 17 '17 at 8:53
add a comment |
I found that I needed to perform both of the previous answers, in this order:
sudo modprobe ipt_LOG
sudo sysctl net.netfilter.nf_log.2=ipt_LOG
Here are a couple of things that I discovered along the way.
You can get a list of valid loggers (along with the currently selected logger) with the following:
cat /proc/net/netfilter/nf_log
The numbers here represent the protocol family numbers, as defined in /usr/include/bits/socket.h. 2 is AF_INET (that's IPv4), and 10 is AF_INET6 (IPv6).
answered Aug 9 '13 at 12:26
mavitmavit
18313
add a comment |
This worked for me sudo sysctl net.netfilter.nf_log.2=ipt_LOG
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
Run:
modprobe ipt_LOG
That fixed it for me.
edited May 21 at 23:13
bain
17515
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
Thanks, that worked! The logs are available in /var/log/syslog or /var/log/kern.log
– bernie
Sep 24 '12 at 18:55
add a comment |
Run:
modprobe ipt_LOG
That fixed it for me.
edited May 21 at 23:13
bain
17515
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
Thanks, that worked! The logs are available in /var/log/syslog or /var/log/kern.log
– bernie
Sep 24 '12 at 18:55
add a comment |
Run:
modprobe ipt_LOG
That fixed it for me.
edited May 21 at 23:13
bain
17515
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
Run:
modprobe ipt_LOG
That fixed it for me.
edited May 21 at 23:13
bain
17515
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
edited May 21 at 23:13
bain
17515
edited May 21 at 23:13
bain
17515
edited May 21 at 23:13
bain
17515
17515
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
answered Jun 13 '12 at 10:03
Gido BrunoGido Bruno
962
962
Thanks, that worked! The logs are available in /var/log/syslog or /var/log/kern.log
– bernie
Sep 24 '12 at 18:55
add a comment |
Thanks, that worked! The logs are available in /var/log/syslog or /var/log/kern.log
– bernie
Sep 24 '12 at 18:55
Thanks, that worked! The logs are available in /var/log/syslog or /var/log/kern.log
– bernie
Sep 24 '12 at 18:55
Thanks, that worked! The logs are available in /var/log/syslog or /var/log/kern.log
– bernie
Sep 24 '12 at 18:55
add a comment |
Seems like (i.e. works for me) with new kernel this is needed (for IPv4):
modprobe nf_log_ipv4
sysctl net.netfilter.nf_log.2=nf_log_ipv4
credits:
- https://www.centos.org/forums/viewtopic.php?f=47&t=54411
- upvoting other answers as they gave me important hints
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
This was the one that worked for me on Ubuntu 16.04 (kernel 4.4.0-21-generic)
– Ash Berlin-Taylor
Mar 17 '17 at 8:53
add a comment |
Seems like (i.e. works for me) with new kernel this is needed (for IPv4):
modprobe nf_log_ipv4
sysctl net.netfilter.nf_log.2=nf_log_ipv4
credits:
- https://www.centos.org/forums/viewtopic.php?f=47&t=54411
- upvoting other answers as they gave me important hints
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
This was the one that worked for me on Ubuntu 16.04 (kernel 4.4.0-21-generic)
– Ash Berlin-Taylor
Mar 17 '17 at 8:53
add a comment |
Seems like (i.e. works for me) with new kernel this is needed (for IPv4):
modprobe nf_log_ipv4
sysctl net.netfilter.nf_log.2=nf_log_ipv4
credits:
- https://www.centos.org/forums/viewtopic.php?f=47&t=54411
- upvoting other answers as they gave me important hints
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
Seems like (i.e. works for me) with new kernel this is needed (for IPv4):
modprobe nf_log_ipv4
sysctl net.netfilter.nf_log.2=nf_log_ipv4
credits:
- https://www.centos.org/forums/viewtopic.php?f=47&t=54411
- upvoting other answers as they gave me important hints
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
edited Jan 22 '16 at 18:29
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
answered Nov 27 '15 at 22:00
akostadinovakostadinov
739511
739511
This was the one that worked for me on Ubuntu 16.04 (kernel 4.4.0-21-generic)
– Ash Berlin-Taylor
Mar 17 '17 at 8:53
add a comment |
This was the one that worked for me on Ubuntu 16.04 (kernel 4.4.0-21-generic)
– Ash Berlin-Taylor
Mar 17 '17 at 8:53
This was the one that worked for me on Ubuntu 16.04 (kernel 4.4.0-21-generic)
– Ash Berlin-Taylor
Mar 17 '17 at 8:53
This was the one that worked for me on Ubuntu 16.04 (kernel 4.4.0-21-generic)
– Ash Berlin-Taylor
Mar 17 '17 at 8:53
add a comment |
I found that I needed to perform both of the previous answers, in this order:
sudo modprobe ipt_LOG
sudo sysctl net.netfilter.nf_log.2=ipt_LOG
Here are a couple of things that I discovered along the way.
You can get a list of valid loggers (along with the currently selected logger) with the following:
cat /proc/net/netfilter/nf_log
The numbers here represent the protocol family numbers, as defined in /usr/include/bits/socket.h. 2 is AF_INET (that's IPv4), and 10 is AF_INET6 (IPv6).
answered Aug 9 '13 at 12:26
mavitmavit
18313
add a comment |
I found that I needed to perform both of the previous answers, in this order:
sudo modprobe ipt_LOG
sudo sysctl net.netfilter.nf_log.2=ipt_LOG
Here are a couple of things that I discovered along the way.
You can get a list of valid loggers (along with the currently selected logger) with the following:
cat /proc/net/netfilter/nf_log
The numbers here represent the protocol family numbers, as defined in /usr/include/bits/socket.h. 2 is AF_INET (that's IPv4), and 10 is AF_INET6 (IPv6).
answered Aug 9 '13 at 12:26
mavitmavit
18313
add a comment |
I found that I needed to perform both of the previous answers, in this order:
sudo modprobe ipt_LOG
sudo sysctl net.netfilter.nf_log.2=ipt_LOG
Here are a couple of things that I discovered along the way.
You can get a list of valid loggers (along with the currently selected logger) with the following:
cat /proc/net/netfilter/nf_log
The numbers here represent the protocol family numbers, as defined in /usr/include/bits/socket.h. 2 is AF_INET (that's IPv4), and 10 is AF_INET6 (IPv6).
answered Aug 9 '13 at 12:26
mavitmavit
18313
I found that I needed to perform both of the previous answers, in this order:
sudo modprobe ipt_LOG
sudo sysctl net.netfilter.nf_log.2=ipt_LOG
Here are a couple of things that I discovered along the way.
You can get a list of valid loggers (along with the currently selected logger) with the following:
cat /proc/net/netfilter/nf_log
The numbers here represent the protocol family numbers, as defined in /usr/include/bits/socket.h. 2 is AF_INET (that's IPv4), and 10 is AF_INET6 (IPv6).
answered Aug 9 '13 at 12:26
mavitmavit
18313
answered Aug 9 '13 at 12:26
mavitmavit
18313
answered Aug 9 '13 at 12:26
mavitmavit
18313
answered Aug 9 '13 at 12:26
mavitmavit
18313
18313
add a comment |
add a comment |
This worked for me sudo sysctl net.netfilter.nf_log.2=ipt_LOG
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
add a comment |
This worked for me sudo sysctl net.netfilter.nf_log.2=ipt_LOG
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
add a comment |
This worked for me sudo sysctl net.netfilter.nf_log.2=ipt_LOG
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
This worked for me sudo sysctl net.netfilter.nf_log.2=ipt_LOG
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
answered Jan 7 '13 at 23:49
Nikolay BryskinNikolay Bryskin
211
211
add a comment |
add a comment |
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1
just stumpled upon a python program (which is also called iptables-trace :). When started it adds a TRACE rule with specified conditions into running iptables, parses and display formatted output for resulting TRACE output until the program is stopped (which removes the TRACE rule from iptables). Will try this soon...
– chris
May 31 '16 at 19:31