est' 3 compa A,B,C. A i C v raznikh podsetakh B-router. na vsekh compakh Linux. k A i C ya imeyu dostup kak root k B - net. u A est' vikhod v internet (cherez B) u C netu (den'gi ne zaplatil). no C imeet dostup k A. na A nastroil firewall i masquearading i proveril chto vse rabotaet. pishu na C: route add default gw {IP_A} otvet: SIOCADDR..: Network Unreachable. no A pingaetsa s B. chto delat' ?