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IPtables applies rules from the top down in the list. If there are Allow Rules before a Reject, the Allow rules will take precedent. To block a Network range it needs to be added at the beginning of the IPTables Rules. iptables -I INPUT 1 -s 172.16.0.0/16 -j REJECT Will insert a Reject rule for the network 172.16.0.0/16 as the fist line in IPtables. A ...


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To change the state of the network link for a KVM guest it would be much better to use the appropriate tool, i.e. the hypervisor virsh domif-setlink domain interface-device state Modify link state of the domain’s virtual interface. Possible values for state are "up" and "down". If --config is specified, only the persistent configuration of the ...


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I would approach this by adding a static route on the default gateway in 192.168.1.0/24 network, which would say that all packets to 10.10.2.0/24 network would be routed via 192.168.1.101 node. Then, you would need to enable IP forwarding on 192.168.1.101. Then, you would also need to add route to 192.168.1.0/24 via 10.10.2.1 on Box B. This way you can ...


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You are correct that with the REDIRECT, Squid cannot see the original intended destination IP; instead it will resolve the host provided by the client in the Host: HTTP header, which is mandatory in HTTP 1.1.


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You've got an asymmetric routing situation involving NAT, here, and that isn't going to work. Of course, if your target instance has a public IP anyway, it would seem that there's not much of a bastion effect going on at the bastion host... but assuming you have a logical reason, here's my take on the problem: Let's call the client machine C, the bastion ...



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