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So, I will show how to set some rules to reduce the risk that incoming traffic to your host is malicious, and then later in the Kernel Parameters section I will introduce some kernel parameters that will also help further reduce the risk of these sorts of attacks The first set of rules you will add handle traffic that allegedly comes from your own host Incoming traffic with the source addresses of your system is going to be spoofed traffic because you know it cannot be generated by the host or it would be outgoing rather than incoming You add a rule to handle packets allegedly from the internal LAN IP address and then a rule to handle packets allegedly to the external IP address kitten# iptables -A INPUT -i eth1 -s 1921680100 -j DROP kitten# iptables -A INPUT -i eth0 -s 22024052.

228 -j DROP You can also add a rule saying that any outgoing traffic that is not from your source IP address is incorrect This is both useful to stop your host sending bad packets and also polite as your host should not be generating packets that do not come from your IP address kitten# iptables -A OUTPUT -o eth1 -s ! 1921680100 -j DROP kitten# iptables -A OUTPUT -o eth0 -s ! 22024052228 -j DROP These rule uses the negate symbol (!) together with the source address to indicate all outgoing traffic not from the specified IP address For example, in the first rule, all traffic that is not from IP address1921680100 is dropped This is because only traffic from the IP address 1921680100 should be outgoing from this interface.

You can also use the negate symbol on most other iptables flags; for example, to select all traffic except ICMP you could use the following rule: , kitten# iptables -A INPUT -p ! imcp -J ACCEPT As you were using iptables on a bastion host between your network and the Internet, you will block the RFC 1918 private address space ranges9 These address ranges, 10000/8, 1721600/12, and 19216800/16, are reserved for private IP networks and should be used only as internal IP addresses ranges These addresses are not routable on the Internet You should block these address ranges on any Internet-facing interfaces kitten# iptables -A INPUT -i eth0 -s 10000/8 -j DROP kitten# iptables -A INPUT -i eth0 -s 1721600/12 -j DROP kitten# iptables -A INPUT -i eth0 -s 1921680.

When you make changes to your database then you will also need to update your EDM. To update the model simply right-click on the design surface and select Update Model from Database. Visual Studio will then bring up a dialog box allowing you to add additional tables and fields (Figure 8-8). Note that this release of EF improves the resolution of conflicts/orphaned model elements in the model browser window:

0/16 -j DROP You do not need to block this traffic on the internal network because these address ranges are frequently used, including by the internal network you have specified, as internal address ranges Next you want to block incoming traffic from the Internet that is from the Zeroconf address range10 The Zeroconf address range is used primarily by hosts that use DHCP to acquire their IP address An address from this range is assigned when these hosts are unable to find a DHCP server to provide them with an address It is also being proposed to use this address range to provide addressing when connecting two devices together with a crossover cable Add a rule to prevent any traffic on the Internet and the internal LAN interfaces kitten# iptables -A INPUT -s 16825400/16 -j DROP.

10. http://www.zeroconf.org/

Now you will restrict the TEST-NET 192.0.2.0/24 address range, which is used for test purposes and, like the private address ranges of RFC 1918, should not be routable on the Internet. kitten# iptables -A INPUT -i eth0 -s 192.0.2.0/24 -j DROP Next you want to restrict any incoming traffic coming from the reserved Class D and E IP address ranges and the unallocated address range, 248.0.0.0/5. These are designed for broadcast and experimental purposes only and should not be routed on the Internet. kitten# iptables -A INPUT -i eth0 -s 224.0.0.0/4 -j DROP kitten# iptables -A INPUT -i eth0 -s 240.0.0.0/5 -j DROP kitten# iptables -A INPUT -i eth0 -s 248.0.0.0/5 -j DROP Additionally, restrict the loopback and zero addresses, which also should not be routable on the Internet. kitten# iptables -A INPUT -i eth0 -s 127.0.0.0/8 -j DROP kitten# iptables -A INPUT -i eth0 -s 255.255.255.255/32 -j DROP kitten# iptables -A INPUT -i eth0 -s 0.0.0.0/8 -j DROP Adding these rules to the overall iptables configuration should help keep the bastion host somewhat secure from spoofing, hijacking, and a variety of Denial of Service attacks.

EF allows you to query objects in a number of different ways: LINQ to Entities (L2E) ObjectQuery methods Entity SQL