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Just Lucky Really
Asked: 2014-05-05 09:29:42 +0800 CST

Firewall rules for transmission

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I have transmission installed, which listens on the default port 51413.

I have tried opening everything for this port.

iptables:

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ssh
ACCEPT     icmp --  'Server IP'          anywhere             state NEW,RELATED,ESTABLISHED icmp echo-request
ACCEPT     icmp --  anywhere             anywhere             state RELATED,ESTABLISHED icmp echo-reply
ACCEPT     udp  --  anywhere             anywhere             state RELATED,ESTABLISHED udp spt:domain dpts:1024:65535
ACCEPT     tcp  --  anywhere             anywhere             tcp spt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
ACCEPT     udp  --  anywhere             anywhere             udp spt:bootpc dpt:bootps
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:9091
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:51413
ACCEPT     udp  --  anywhere             anywhere             udp dpt:51513
ACCEPT     tcp  --  anywhere             anywhere             tcp spt:51413
ACCEPT     udp  --  anywhere             anywhere             udp spt:51413
LOGGING    all  --  anywhere             anywhere
DROP       all  --  anywhere             anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere             tcp spt:ssh
ACCEPT     icmp --  anywhere             anywhere             state NEW,RELATED,ESTABLISHED icmp echo-request
ACCEPT     icmp --  anywhere             anywhere             state RELATED,ESTABLISHED icmp echo-reply
ACCEPT     udp  --  anywhere             anywhere             udp dpt:domain
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp spt:http 
ACCEPT     udp  --  anywhere             anywhere             udp spt:bootps dpt:bootpc
ACCEPT     tcp  --  anywhere             anywhere             tcp spt:9091
ACCEPT     tcp  --  anywhere             anywhere             tcp spt:51413
ACCEPT     udp  --  anywhere             anywhere             udp spt:51413
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:51413
ACCEPT     udp  --  anywhere             anywhere             udp dpt:51413
LOGGING    all  --  anywhere             anywhere
DROP       all  --  anywhere             anywhere

Chain LOGGING (2 references)
target     prot opt source               destination
LOG        all  --  anywhere             anywhere             limit: avg 12/min burst 5 LOG level warning prefix "FirewallDrops: "
DROP       all  --  anywhere             anywhere

But it still won't let traffic through.

If I flush the tables:

iptables -F

it then works, so I imagine there is something I'm missing in iptables.

Logging output:

/var/log/kern.log:May  5 18:43:32 StretchSvr kernel: [    9.258012] FirewallDrops: IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=72 TOS=0x00 PREC=0xC0 TTL=64 ID=2371 PROTO=ICMP TYPE=3 CODE=3 [SRC=127.0.0.1 DST=127.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=64 ID=2370 DF PROTO=UDP SPT=51413 DPT=80 LEN=24 ] 
/var/log/kern.log:May  5 18:43:32 StretchSvr kernel: [    9.298081] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=62.210.137.203 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=53 ID=55801 PROTO=UDP SPT=1337 DPT=51413 LEN=24
/var/log/kern.log:May  5 18:43:32 StretchSvr kernel: [    9.305079] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.226 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=80 DPT=51413 LEN=24 
/var/log/kern.log:May  5 18:44:53 StretchSvr kernel: [   90.444453] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=62.210.137.203 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=54 ID=55802 PROTO=UDP SPT=1337 DPT=51413 LEN=24 
/var/log/kern.log:May  5 18:44:53 StretchSvr kernel: [   90.453131] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.225 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=6969 DPT=51413 LEN=24 
/var/log/kern.log:May  5 18:44:53 StretchSvr kernel: [   90.456361] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.226 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=80 DPT=51413 LEN=24 
/var/log/kern.log:May  5 18:44:53 StretchSvr kernel: [   90.458255] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.252 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=51 ID=0 DF PROTO=UDP SPT=80 DPT=51413 LEN=24 
/var/log/kern.log:May  5 18:45:01 StretchSvr kernel: [   98.435703] FirewallDrops: IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=72 TOS=0x00 PREC=0xC0 TTL=64 ID=2373 PROTO=ICMP TYPE=3 CODE=3 [SRC=127.0.0.1 DST=127.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=64 ID=2372 DF PROTO=UDP SPT=51413 DPT=80 LEN=24 ] 
/var/log/syslog:May  5 18:43:32 StretchSvr kernel: [    9.258012] FirewallDrops: IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=72 TOS=0x00 PREC=0xC0 TTL=64 ID=2371 PROTO=ICMP TYPE=3 CODE=3 [SRC=127.0.0.1 DST=127.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=64 ID=2370 DF PROTO=UDP SPT=51413 DPT=80 LEN=24 ] 
/var/log/syslog:May  5 18:43:32 StretchSvr kernel: [    9.298081] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=62.210.137.203 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=53 ID=55801 PROTO=UDP SPT=1337 DPT=51413 LEN=24 
/var/log/syslog:May  5 18:43:32 StretchSvr kernel: [    9.305079] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.226 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=80 DPT=51413 LEN=24 
/var/log/syslog:May  5 18:44:53 StretchSvr kernel: [   90.444453] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=62.210.137.203 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=54 ID=55802 PROTO=UDP SPT=1337 DPT=51413 LEN=24 
/var/log/syslog:May  5 18:44:53 StretchSvr kernel: [   90.453131] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.225 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=6969 DPT=51413 LEN=24 
/var/log/syslog:May  5 18:44:53 StretchSvr kernel: [   90.456361] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.226 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=80 DPT=51413 LEN=24 
/var/log/syslog:May  5 18:44:53 StretchSvr kernel: [   90.458255] FirewallDrops: IN=eth0 OUT= MAC='Svr MAC Address' SRC=31.172.63.252 DST='Svr IP Address' LEN=44 TOS=0x00 PREC=0x00 TTL=51 ID=0 DF PROTO=UDP SPT=80 DPT=51413 LEN=24

Any help appreciated.

firewall

1 Answers

  1. So as I explained in the comments above, it was a typo I made Lol ... I had my INPUT udp port as 51513 instead of 51413 ...

    But, just in case anyone wants to know, these are the rules that I have used to allow Transmission:

    iptables -A INPUT -m state --state RELATED,ESTABLISHED -p udp --dport 51413 -j ACCEPT
iptables -A OUTPUT -p udp --sport 51413 -j ACCEPT

    Thanks everyone for their input

    • 4