So, routing table for the client is like this:
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Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.0.3.2 0.0.0.0 UG 0 0 0 eth1 <---- NAT to guest which is dual-homed to 4G and ADSL
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 <---- Bridged to guest which is connected to ADSL
10.0.3.0 * 255.255.255.0 U 0 0 0 eth1
10.13.13.0 10.13.13.17 255.255.255.0 UG 0 0 0 tun0
10.13.13.17 * 255.255.255.255 UH 0 0 0 tun0
127.0.0.1 * 255.255.255.255 UH 0 0 0 lo
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
My server management interface log goes like this:
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LOG:1631411624,,Float requested for peer 0 to 59.90.254.199:43831
>LOG:1631411624,,peer 0 (tclinx) floated from 157.40.199.68:49429 to [AF_INET]59.90.254.199:43831
>LOG:1631411635,,Float requested for peer 0 to 157.40.199.68:49429
>LOG:1631411635,,peer 0 (tclinx) floated from 59.90.254.199:43831 to [AF_INET]157.40.199.68:49429
>LOG:1631411674,,Float requested for peer 0 to 59.90.254.199:43831
>LOG:1631411674,,peer 0 (tclinx) floated from 157.40.199.68:49429 to [AF_INET]59.90.254.199:43831
>LOG:1631411675,,Float requested for peer 0 to 157.40.199.68:49429
>LOG:1631411675,,peer 0 (tclinx) floated from 59.90.254.199:43831 to [AF_INET]157.40.199.68:49429
>LOG:1631411715,,Float requested for peer 0 to 59.90.254.199:43831
>LOG:1631411715,,peer 0 (tclinx) floated from 157.40.199.68:49429 to [AF_INET]59.90.254.199:43831