Name
arprules — Shorewall ARP rules file
Synopsis
/etc/shorewall/arprules
Description
This file was added in Shorewall 4.5.12 and is used to describe low-level rules managed by arptables (8). These rules only affect Address Resolution Protocol (ARP), Reverse Address Resolution Protocol (RARP) and Dynamic Reverse Address Resolution Protocol (DRARP) frames.
The columns in the file are as shown below. MAC addresses are specified normally (6 hexadecimal numbers separated by colons).
- ACTION
Describes the action to take when a frame matches the criteria in the other columns. Possible values are:
- ACCEPT
This is the default action if no rules matches a frame; it lets the frame go through.
- DROP
Causes the frame to be dropped.
- SNAT:
ip-address Modifies the source IP address to the specified
ip-address.- DNAT:
ip-address Modifies the destination IP address to the specified
ip-address.- SMAT:
mac-address Modifies the source MAC address to the specified
mac-address.- DMAT:
mac-address Modifies the destination MAC address to the specified
mac-address.- SNATC:
ip-address Like SNAT except that the frame is then passed to the next rule.
- DNATC:
ip-address Like DNAT except that the frame is then passed to the next rule.
- SMATC:
mac-address Like SMAT except that the frame is then passed to the next rule.
- DMATC:
mac-address Like DMAT except that the frame is then passed to the next rule.
- SOURCE - [
interface[:[!]ipaddress[/ipmask][:[!]macaddress[/macmask]]]] Where
interfaceIs an interface defined in shorewall-interfaces(5).
ipaddressis an IPv4 address. DNS names are not allowed.
ipmaskspecifies a mask to be applied to
ipaddress.macaddressThe source MAC address.
macmaskMask for MAC address; must be specified as 6 hexadecimal numbers separated by colons.
When '!' is specified, the test is inverted.
If not specified, matches only frames originating on the firewall itself.
Caution
Either SOURCE or DEST must be specified.
- DEST - [
interface[:[!]ipaddress[/ipmask][:[!]macaddress[/macmask]]]] Where
interfaceIs an interface defined in shorewall-interfaces(5).
ipaddressis an IPv4 address. DNS Names are not allowed.
ipmaskspecifies a mask to be applied to frame addresses.
macaddressThe destination MAC address.
macmaskMask for MAC address; must be specified as 6 hexadecimal numbers separated by colons.
When '!' is specified, the test is inverted and the rule matches frames which do not match the specified address/mask.
If not specified, matches only frames originating on the firewall itself.
If both SOURCE and DEST are specified, then both interfaces must be bridge ports on the same bridge.
Caution
Either SOURCE or DEST must be specified.
- ARP OPCODE - [[!]
opcode] Optional. Describes the type of frame. Possible
opcodevalues are:- 1
ARP Request
- 2
ARP Reply
- 3
RARP Request
- 4
RARP Reply
- 5
Dynamic RARP Request
- 6
Dynamic RARP Reply
- 7
Dynamic RARP Error
- 8
InARP Request
- 9
ARP NAK
When '!' is specified, the test is inverted and the rule matches frames which do not match the specified
opcode.
