Iptables netmap

Sep 07, 2015 · The distribution is flow-aware (i.e. packets of one connection will always end up in the same application). At the moment, packet-bricks uses netmap packet I/O framework for receiving packets. It employs netmap pipes to forward packets to end host applications. (Credit goes to Asim Jamshed, who pulled this off as part of an internship at ICSI.)

Apr 15, 2018 · This is a straight hands-on post. Example of 1:1 Public-to-Private IP mapping. /ip firewall nat add chain=dstnat dst-address= action=netmap to-addresses= I did some tests with iptables NETMAP but I can't manage to make it work because I don't find a way to modify source+destination after routing decision. I prefer to avoid the new --client-nat OpenVPN's feature. Maybe I have to force routing with ip route? Or to loop twice into the network stack with veth? Note : I don't want to use masquerade. I'll need something like: ip6tables -t nat -A POSTROUTING -o eth0 -s fc00::/64 -j NETMAP --to 2006::/64 to nat the addresses to global addresses (and with proper dnat rules) But I can not find anything like that in nftables 2019-04-03 - Phil Sutter - 1.4.21-31 - Fix iptables-restore with empty comment in rule (RHBZ#1668475) - Fix parsing and printing of -m ipvs --vproto option (RHBZ#1679726) - Fix for wrong location of devgroup definition file (RHBZ#1657075) - Fix for non-numeric devgroup name output (RHBZ#1657075) - Reject negative realm /ip firewall nat add chain=dstnat dst-address=11.11.11.0/24 \ action=netmap to-addresses=2.2.2.0/24 /ip firewall nat add chain=srcnat src-address=2.2.2.0/24 \ action=netmap to-addresses=11.11.11.0/24 Same can be written using different address notation, that still have to match with the described network

Dec 07, 2019 · Iptables is a great firewall included in the netfilter framework of Linux. A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Configuring iptables manually is challenging for the uninitiated. Fortunately, there are many configuration tools available to assist:

iptables -A OUTPUT -m bpf --bytecode '4,48 0 0 9,21 0 1 6,6 0 0 1,6 0 0 0' -j ACCEPT Or instead, you can invoke the nfbpf_compile utility. iptables -A OUTPUT -m bpf --bytecode "`nfbpf_compile RAW 'ip proto 6'`" -j ACCEPT Or use tcpdump -ddd. In that case, generate BPF targeting a device with the same data link type as the xtables match. Your iptables must have NETMAP support. NETMAP support is available in iptables 1.2.9 and later. Network mapping is defined using the /etc/shorewall/netmap file.

iptables-extensionsSection: iptables 1.4.18 (8)Updated: Index NAMEiptables-extensions --- list of extensions in the standard iptables distribution SYNOPSISip6tables [-m name [module-_netmap ip6tables

NETMAP This target allows you to statically map a whole network of addresses onto another network of addresses. iptables is a pure packet filter when using the # iptables -t nat -A PREROUTING -d 1.2.3.0/24 -j NETMAP --to 5.6.7.0/24 # iptables -t nat --list Chain PREROUTING (policy ACCEPT) target prot opt source destination NETMAP all -- anywhere 1.2.3.0/24 5.6.7.0/24 Supported options for NETMAP target are :--to address[/mask] 我想用iptables让两个网段的机器能互相访问，但不成功： # iptables -t nat -A PREROUTING -d 10.0.0.0/8 -j NETMAP --to 192.168.197.0/24 iptables -t mangle -A PREROUTING -s 192.168.1.0/24 -j NETMAP --to 10.5.6.0/24: 説明: これが NETMAP ターゲット唯一のオプション。上記の例だと、 192.168.1.x のホスト群が根こそぎ 10.5.6.x へと変換される。 iptables -A OUTPUT -m bpf --bytecode '4,48 0 0 9,21 0 1 6,6 0 0 1,6 0 0 0' -j ACCEPT Or instead, you can invoke the nfbpf_compile utility. iptables -A OUTPUT -m bpf --bytecode "`nfbpf_compile RAW 'ip proto 6'`" -j ACCEPT Or use tcpdump -ddd. In that case, generate BPF targeting a device with the same data link type as the xtables match. Your iptables must have NETMAP support. NETMAP support is available in iptables 1.2.9 and later. Network mapping is defined using the /etc/shorewall/netmap file.