os clientes não se conectam ao servidor do squid

Question

Atualmente, estou tentando criar um servidor de lula no meu laptop pessoal para permitir que alguns PCs em meu trabalho se conectem à Internet por meio de uma vpn no meu laptop.

Instalei e configurei o squid no meu laptop rodando o Debian 9, e conectei meu laptop ao meu trabalho LAN (IP = 10.75.245.21).

Então eu configurei um PC executando o Windows 10 (IP = 10.75.245.20) para usar o proxy no meu computador (porta = 3128). Mas quando tento acessar qualquer página da internet, a conexão falha.

alguma ideia sobre como corrigir isso?

Informação adicional

Todos os computadores na LAN têm IP fixo com a máscara de sub-rede 255.255.254.0 A rede aqui também tem acesso à Internet, mas tem um firewall muito estrito (o motivo que eu quero rotear conexões através de VPN) Todos os computadores e meu laptop estão no mesma sub-rede Meu computador também está conectado a uma rede sem fio. Estou usando um protocolo Cisco VPN no meu computador

quando tento abrir uma página da internet o comando netstat -na | grep 3128 no meu computador (servidor) mostra:

    tcp6       0      0 :::3128                 :::*                    LISTEN
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52802      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52803      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52798      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52806      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52804      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52805      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52801      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52800      SYN_RECV
    tcp6       0      0 10.75.245.21:3128       10.75.245.20:52799      SYN_RECV

e o comando netstat no cliente mostra:

    TCP    10.75.245.20:52798     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52799     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52800     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52801     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52802     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52803     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52804     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52805     10.75.245.21:3128      ESTABLISHED
    TCP    10.75.245.20:52806     10.75.245.21:3128      ESTABLISHED

Thnx para qualquer ajuda!

edit1: arquivo cache.log:

    2018/01/30 10:50:00 kid1| Starting Squid Cache version 3.5.23 for x86_64-pc-linux-gnu...
    2018/01/30 10:50:00 kid1| Service Name: squid
    2018/01/30 10:50:00 kid1| Process ID 8839
    2018/01/30 10:50:00 kid1| Process Roles: worker
    2018/01/30 10:50:00 kid1| With 65535 file descriptors available
    2018/01/30 10:50:00 kid1| Initializing IP Cache...
    2018/01/30 10:50:00 kid1| DNS Socket created at [::], FD 6
    2018/01/30 10:50:00 kid1| DNS Socket created at 0.0.0.0, FD 8
    2018/01/30 10:50:00 kid1| Adding nameserver 192.10.15.1 from /etc/resolv.conf
    2018/01/30 10:50:00 kid1| Logfile: opening log daemon:/var/log/squid/access.log
    2018/01/30 10:50:00 kid1| Logfile Daemon: opening log /var/log/squid/access.log
    2018/01/30 10:50:00 kid1| Local cache digest enabled; rebuild/rewrite every 3600/3600 sec
    2018/01/30 10:50:00 kid1| Store logging disabled
    2018/01/30 10:50:00 kid1| Swap maxSize 0 + 262144 KB, estimated 20164 objects
    2018/01/30 10:50:00 kid1| Target number of buckets: 1008
    2018/01/30 10:50:00 kid1| Using 8192 Store buckets
    2018/01/30 10:50:00 kid1| Max Mem  size: 262144 KB
    2018/01/30 10:50:00 kid1| Max Swap size: 0 KB
    2018/01/30 10:50:00 kid1| Using Least Load store dir selection
    2018/01/30 10:50:00 kid1| Set Current Directory to /var/spool/squid
    2018/01/30 10:50:00 kid1| Finished loading MIME types and icons.
    2018/01/30 10:50:00 kid1| HTCP Disabled.
    2018/01/30 10:50:00 kid1| Pinger socket opened on FD 13
    2018/01/30 10:50:00 kid1| Squid plugin modules loaded: 0
    2018/01/30 10:50:00 kid1| Adaptation support is off.
    2018/01/30 10:50:00 kid1| Accepting HTTP Socket connections at local=[::]:3128 remote=[::] FD 11 flags=9
    2018/01/30 10:50:00| pinger: Initialising ICMP pinger ...
    2018/01/30 10:50:00| pinger: ICMP socket opened.
    2018/01/30 10:50:00| pinger: ICMPv6 socket opened
    2018/01/30 10:50:01 kid1| storeLateRelease: released 0 objects
    2018/01/30 11:30:00 kid1| Logfile: opening log stdio:/var/log/squid/netdb.state
    2018/01/30 11:30:00 kid1| Logfile: closing log stdio:/var/log/squid/netdb.state
    2018/01/30 11:30:00 kid1| NETDB state saved; 0 entries, 0 msec
    2018/01/30 11:40:01 kid1| Preparing for shutdown after 0 requests
    2018/01/30 11:40:01 kid1| Waiting 30 seconds for active connections to finish
    2018/01/30 11:40:01 kid1| Closing HTTP port [::]:3128
    2018/01/30 11:40:01 kid1| Closing Pinger socket on FD 13
    2018/01/30 11:40:08| Pinger exiting.
    2018/01/30 11:40:32 kid1| Shutdown: NTLM authentication.
    2018/01/30 11:40:32 kid1| Shutdown: Negotiate authentication.
    2018/01/30 11:40:32 kid1| Shutdown: Digest authentication.
    2018/01/30 11:40:32 kid1| Shutdown: Basic authentication.
    2018/01/30 11:40:32 kid1| Shutting down...