Monday , September 28 2020
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fun with wildcard mask on Huawei device

You, as the network administrator, were tasked with providing access to a network, where 4 machines have been connected.

It is simple task. Nothing can happen, but…

Everything is ready and you are checking connectivity between RT2 and those machines, and… To your suprise, you can only ping even-numbered IP addresses:

[RT2]ping 192.168.10.1
   PING 192.168.10.1: 56  data bytes, press CTRL_C to break
     Request time out
     Request time out
     Request time out
     Request time out
     Request time out

 [RT2]ping 192.168.10.2
   PING 192.168.10.2: 56  data bytes, press CTRL_C to break
     Reply from 192.168.10.2: bytes=56 Sequence=1 ttl=127 time=30 ms
     Reply from 192.168.10.2: bytes=56 Sequence=2 ttl=127 time=20 ms
     Reply from 192.168.10.2: bytes=56 Sequence=3 ttl=127 time=30 ms
     Reply from 192.168.10.2: bytes=56 Sequence=4 ttl=127 time=40 ms
     Reply from 192.168.10.2: bytes=56 Sequence=5 ttl=127 time=30 ms

 [RT2]ping 192.168.10.3
   PING 192.168.10.3: 56  data bytes, press CTRL_C to break
     Request time out
     Request time out
     Request time out
     Request time out
     Request time out

 [RT2]ping 192.168.10.4
   PING 192.168.10.4: 56  data bytes, press CTRL_C to break
     Reply from 192.168.10.4: bytes=56 Sequence=1 ttl=127 time=30 ms
     Reply from 192.168.10.4: bytes=56 Sequence=2 ttl=127 time=40 ms
     Reply from 192.168.10.4: bytes=56 Sequence=3 ttl=127 time=30 ms
     Reply from 192.168.10.4: bytes=56 Sequence=4 ttl=127 time=30 ms
     Reply from 192.168.10.4: bytes=56 Sequence=5 ttl=127 time=30 ms

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Inter-VLAN communication on USG firewall

It’s time to check a firewall available in eNSP simulator. Today a simple task, just configuring inter-VLAN communication on Huawei USG5500.

Let’s look at the following topology:

 

Configuration roadmap:

  1. Configure L2 communication on the switch.
  2. As the switch is L2, configure subinterfaces on the firewall and enable L3 communication between different VLANs.
  3. Set IP addresses and gateways for all PCs.
  4. Create 2 security zones and configure interzone packet-filterfing to control traffic between VLANs.
  5. Security requirements for the network:
  • PC1 in VLAN100 and PC2 in VLAN200 can communicate each other.
  • PC3 in VLAN300 can access PC1 and PC2. PC1 and PC2 cannot access PC3.

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NAT server on Huawei USG5500

The last article dealt with outbound NAT. Let’s focus today on NAT server. NAT server enables private network servers to provide services for external networks with public IP addresses. In this lab, our enterprise provides FTP services for external users.

We can use the topology from the last post:

In our case AR router works as FTP server:

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outbound NAT on Huawei USG5500

What does it mean outbound NAT?

Outbound NAT translates the source IP addresses of packets sent from a high-priority security zone to a low-priority one.

I allowed myself to post a flowchart of configuring intranet users to access extranet through NAT (from Huawei documentation):

It easily lets us to choose a suitable way of configuring outbound NAT. In this lab I will try to do a review of these methods.

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https—>webUI—>Huawei Secospace USG6300

As a graphical user interface is useless in case of routers and switches, it looks useful when configuring a firewall. Of course it is my point of view. I do not go into what is better for you. I like using CLI but, sometimes, it is worth to simplify your daily routine. The first step is to configure HTTPS access to webUI of USG6300. This is what we will focus today.

Well known topology from the last post:

Topology_USG_access

Configure IP address of firewall’s interface and add it to trust zone:

[USG6300]interface GigabitEthernet 0/0/7
[USG6300-GigabitEthernet0/0/7]ip address 172.16.1.1 24

[USG6300]firewall zone trust
[USG6300-zone-trust]add interface GigabitEthernet 0/0/7

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