Question on security regarding coming in from the WAN (Zyxel/Billion)

Soldato
Joined
1 Dec 2004
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23,096
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S.Wales
Hi all,

I'm doing a demo test for a new set-up, the above set-up works fine, however there is slight network jitter and at moment it goes absolutely crazy, pings will be normal 40-50ms for hours then bang straight up to 600-700ms and we have pinpointed one or two culprit's on the network and asked to scan but problems seem to be re-appearing, quite a few sporadic spikes also

The single port Zyxel modem is sat on a BT line with NAT on providing the connection, this passes traffic to a Billion sat on EWAN which is doing the main routing and 3G failover and fall-back, on the Billion NAT is on and the firewall is disabled.

I want to enable the firewall to see if this stops the issue however when I do I lose remote access to this billion, even though remote management is enabled.

I have two questions really, is the firewall a serious security threat even though NAT is turned on? problem is there is a VPN set-up on here to a centrally hosted firewall, unfortunately they are not on a private connection just yet but planning to, at the moment they are on a public connection.

Could it just be someone's machine infected internally or the this firewall issue on the Billion.
 
The firewall should be turned on really. Its a shame you are double nat'ing it could be that is some of your issues I've seen strange things happen when you double Nat.
 
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