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Tag Archives: Huawei VRP

PAT or no-PAT – source NAT on Huawei USG6000

If you, for some reason, cannot use easy-ip NAT, you can use source NAT with NAT address pool. Depending on how many public IP addresses you have got, you can configure no-PAT option, when only IP address is translated or you can set PAT, in other words NAT with port translation to assure LAN users accessing Internet. Details in the video 😉

USG firewall configuration script:

#
dhcp enable
#
interface GigabitEthernet1/0/0
undo shutdown
ip address 10.0.0.1 255.255.255.0
service-manage ping permit
dhcp select interface
dhcp server excluded-ip-address 10.0.0.100
dhcp server static-bind ip-address 10.0.0.200 mac-address 5489-98b4-6a79
dhcp server dns-list 10.0.0.100
#
interface GigabitEthernet1/0/2
undo shutdown
ip address 5.0.0.2 255.255.255.252
#
firewall zone trust
set priority 85
add interface GigabitEthernet1/0/0
#
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/2
#
ip route-static 0.0.0.0 0.0.0.0 5.0.0.1
#
nat address-group SOURCE-NAT 0
mode pat
route enable
section 0 6.6.6.0 6.6.6.0
OR
nat address-group SOURCE-NAT 0
mode no-pat global
route enable
section 0 6.6.6.0 6.6.6.1
#
security-policy
rule name ALLOW
source-zone local
destination-zone trust
destination-zone untrust
action permit
rule name NAT_EASY
source-zone trust
destination-zone untrust
source-address 10.0.0.0 mask 255.255.255.0
action permit
#
nat-policy
rule name SOURCE-NAT
source-zone trust
destination-zone untrust
source-address 10.0.0.0 mask 255.255.255.0
action source-nat address-group SOURCE-NAT

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IP FRR on Huawei routers

What do we have in traditional IP networks?

Let’s assume that there is a fault at the physical or data link layers. Router sees that a physical interface becomes DOWN. After the router detects this fault, it informs upper layer routing system to update routing information. The convergence time is several seconds, what is critical for sensitive services.

That’s why IP FRR has been developed. After we configure IP FRR, a router doesn’t wait for network convergence but a backup link is immediately used to forward packets.

We have 2 scenarios of using IP FRR:

  1. To protect routers in public networks.
  2. To protect CE routers in private networks.

Let’s focus on the first one.

IP FRR topology

 

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bootrom update on Huawei S5300 switch

Some time ago I had a case with damaged file system on Huawei S5300 switch. It had been caused by power failure on one site. The switch was not able to decompress VRP software and rebooted itself all the time.

BIOS LOADING ...
Copyright (c) 2008-2010 HUAWEI TECH CO., LTD.
(Ver107, Jan 18 2011, 22:52:53)

Press Ctrl+B to enter BOOTROM menu... 1
Auto-booting...
Update Epld file ............................ None
Decompressing VRP software ..................

BIOS LOADING ...
Copyright (c) 2008-2010 HUAWEI TECH CO., LTD.
(Ver107, Jan 18 2011, 22:52:53)

Press Ctrl+B to enter BOOTROM menu... 1
Auto-booting...
Update Epld file ............................ None
Decompressing VRP software ..................

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traffic policy on Huawei router

That was to be expected. Poland is out of Euro Cup. The only thing we can do is to come back to the real world :).

Today I will show you how to use ACLs and traffic policies for packets’ lost troubleshooting in a network.

Huawei ACL and traffic policy configuration

Let’s assume that we have such topology:

What we have to do is to check end-to-end connectivity between CE and R2 Loopback100 interface, to find where packets are being lost.

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